Bamboo, basalt, glass, and polypropylene fiber-reinforced metakaolin based geopolymers: a comparative study
作者：
Zhang, Xinli;Li, Zhenyang;Li, Xia;Shen, Dazhi
期刊：
European Journal of Wood and Wood Products ,2023年81(6):1481-1494 ISSN：0018-3768
通讯作者：
Xinli Zhang
作者机构：
[Zhang, Xinli] Hunan Prov Key Lab Mat Surface & Interface Sci & T, Changsha 410004, Peoples R China.;[Li, Zhenyang; Zhang, Xinli; Shen, Dazhi; Li, Xia] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Xinli Zhang] H;Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology, Changsha, China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
摘要：
Geopolymers usually exhibit poor tensile and flexural strengths due to their brittleness and ceramic features, which are easy to cause catastrophic failure limiting their applications. Fibers can be incorporated into geopolymers to improve flexural properties and fracture toughness. In this work, the effects of four types of fibers including bamboo, basalt, glass, and polypropylene (PP) on bulk density, apparent porosity, water absorption, and compressive and flexural strengths of geopolymers were investigated based on alkali-activated metakaolin. The compressive strength of the composites decreased with fiber content. The flexural strength increased under optimum fiber content, and the optimum content of bamboo, basalt and glass fiber was 1%, while that of PP fiber was 0.8%. Compared with pure geopolymer, the maximum improvements in flexural strength were 35.61%, 16.25%, 15.76%, and 11.41% for basalt, glass, bamboo, and PP fiber-reinforced composites, respectively. Parameters such as thermal stability, chemical composition, and amorphous phase of geopolymers were investigated. The fiber distribution and fiber-matrix interface were observed via optical and scanning electron microscopy. The results contribute to our knowledge of fiber-reinforced geopolymer composites, and offer guidance for further investigation of bamboo fiber reinforced metakaolin-based geopolymer.
语种：
英文
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Regulation of surface oxygen functional groups and pore structure of bamboo-derived hard carbon for enhanced sodium storage performance
作者：
Xu, Tianyue;Qiu, Xuan;Zhang, Xiang;Xia, Yongyao
期刊：
Chemical Engineering Journal ,2023年452:139514 ISSN：1385-8947
通讯作者：
Zhang, Xiang(zhangxiang@csuft.edu.cn)
作者机构：
[Qiu, Xuan; Xia, Yongyao; Xu, Tianyue] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China.;[Zhang, Xiang] Shanghai PuNa Energy Technol Co Ltd, Shanghai 201512, Peoples R China.;[Zhang, Xiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci & T, Changsha 410004, Peoples R China.
通讯机构：
[Xiang Zhang] S;[Yongyao Xia] D;Department of Chemistry, Fudan University, Shanghai 200433, China<&wdkj&>Shanghai PuNa Energy Technology Co., Limited, Shanghai 201512, China<&wdkj&>College of Materials Science and Engineering, Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
关键词：
Bamboo;Carbonyl group;Closed micropore;Hard carbon;Sodium-ion battery;Temperature
摘要：
Hard carbon materials with long low-voltage plateau have been used as the anode materials for sodium ion batteries which are considered to be one of the most potential large-scale energy storage systems. Herein, carbonyl groups and closed micropores are introduced into bamboo-derived hard carbon materials simultaneously to enhance the sodium ion storage performance. The carbonyl groups are demonstrated to enhance the reversible Na adsorption in the sloping region and closed micropores are beneficial to sodium ion storage in the low-voltage plateau region. Moreover, the introducing carbonyl groups improve the reversible sloping capacity not at the expense of increasing specific surface area and deteriorating the initial Coulombic efficiency. The hard carbon carbonized at 1300 °C delivers a high reversible specific capacity of 348.5 mAh g−1 at a current density of 30 mA g−1 with a charge/discharge Coulombic efficiency of 84.1 %, and keeps a specific capacity of 295.9 mAh g−1 with a capacity retention of 91.6 % at a current density of 300 mA g−1 after 500 cycles. This work provides a novel strategy to precisely regulate the microstructure for biomass-derived hard carbon for superior sodium ion storage performance. © 2022
语种：
英文
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Realizing Improved Sodium-Ion Storage by Introducing Carbonyl Groups and Closed Micropores into a Biomass-Derived Hard Carbon Anode
作者：
Deng, Wentao;Cao, Yongjie;Yuan, Guangming;Liu, Gonggang;Zhang, Xiang* ;...
期刊：
ACS Applied Materials & Interfaces ,2021年13(40):47728-47739 ISSN：1944-8244
通讯作者：
Zhang, Xiang;Xia, Yongyao
作者机构：
[Yuan, Guangming; Deng, Wentao; Liu, Gonggang; Zhang, Xiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Peoples R China.;[Xia, Yongyao; Cao, Yongjie] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China.;[Xia, Yongyao] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 211106, Peoples R China.
通讯机构：
[Zhang, Xiang] C;[Xia, Yongyao] N;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Peoples R China.;Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 211106, Peoples R China.
关键词：
anode;biomass;carbonyl groups;hard carbon;sodium-ion battery
摘要：
Micropores and defects, like oxygen-containing groups, as active sites for sodium-ion storage in hard carbon have attracted considerable attention; nevertheless, most oxygen doping or oxidizing processes inevitably introduce undesired oxygen groups into a carbon framework, leading to deteriorated initial Coulombic efficiency (ICE). Here, precise carbonyl groups and closed micropores are together introduced into biomass-derived hard carbon to enhance the Na-ion storage performance. The hard carbon delivers a large reversible capacity of 354.6 mA h g-1 at 30 mA g-1, a high ICE (88.7%), as well as ultra-long cycling stability (277 mA h g-1 at 0.3 A g-1 over 1000 cycles; 243 mA h g-1 at 1 A g-1 over 5000 cycles). The rate capability and cycling stability of hard carbon in carbonate- and diglyme-based electrolytes are contrasted to demonstrate the superiority of diglyme. Cyclic voltammetry at varied scans and galvanostatic intermittent titration techniques are carried out to clarify the disparity between the two different electrolyte systems. Furthermore, the as-prepared hard carbon is utilized as the anode for sodium-ion full cells exhibiting an energy density of 166.2 W h kg-1 at 0.2 C and a long-cycle life (47.9% retention over 200 cycles at 1 C). © 2021 American Chemical Society.
语种：
英文
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Extended low-voltage plateau capacity of hard carbon spheres anode for sodium ion batteries
作者：
Zhang, Xiang;Dong, Xiaoli;Qiu, Xuan;Cao, Yongjie;Wang, Congxiao;...
期刊：
Journal of Power Sources ,2020年476:228550 ISSN：0378-7753
通讯作者：
Xia, Yongyao
作者机构：
[Wang, Yonggang; Qiu, Xuan; Xia, Yongyao; Cao, Yongjie; Wang, Congxiao; Zhang, Xiang; Dong, Xiaoli] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China.;[Zhang, Xiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Xia, Yongyao] F;Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China.
关键词：
Anodes;Carbon;Differential scanning calorimetry;Metal ions;Microcrystals;Phenolic resins;Controlled architecture;High reversible capacities;Intercalation mechanisms;Interlayer distance;Low-voltage plateau;Operating voltage;Reversible capacity;Wide temperature ranges;Sodium-ion batteries
摘要：
Hard carbon is now one of the most promising anode materials for sodium-ion batteries, but achieving high reversible capacity at low voltage plateau (0–0.1 V) is still a major challenge, which can actually enhances the operating voltage as well as the energy density when coupled with cathodes. In this work, a series of hard carbon spheres (HCS) with controlled architectures for sodium ion batteries (SIBs) are prepared by carbonizing synthetic phenolic resin over a wide temperature range from 900 to 2800 °C. HCS treated at 1900 °C (HCS-1900) has a pure hard carbon structure with appropriate graphitic interlayer distance (0.358 nm) and microcrystal size (La ~ 1.61 nm, Lc ≈ 3.07 nm). It delivers a reversible capacity of 295 mAh g−1 and an ultra-large capacity of 248.2 mAh g−1 (84% of the reversible capacity) at low-voltage plateau, in which an intercalation mechanism is proposed for Na ion storage. Exquisite differential scanning calorimetry (DSC) analysis suggests that soliated hard carbon has better thermal stability than that of metallic Na. © 2020 Elsevier B.V.
语种：
英文
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Pine wood-derived hollow carbon fibers@NiO@rGO hybrids as sustainable anodes for lithium-ion batteries
作者：
Zhang, Xiang* ;Huang, Qinyuan;Zhang, Mei;Li, Mengxiao;Hu, Jinbo;...
期刊：
Journal of Alloys and Compounds ,2020年822:153718 ISSN：0925-8388
通讯作者：
Zhang, Xiang;Yuan, Guangming
作者机构：
[Li, Mengxiao; Hu, Jinbo; Yuan, Guangming; Huang, Qinyuan; Zhang, Mei; Zhang, Xiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.;[Hu, Jinbo; Zhang, Xiang] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha, Hunan, Peoples R China.;[Zhang, Xiang; Yuan, GM] 498 Shaoshan South Rd, Changsha 410004, Peoples R China.
通讯机构：
[Zhang, X; Yuan, GM] 4;498 Shaoshan South Rd, Changsha 410004, Peoples R China.
关键词：
Anodes;Biomass;Carbon fibers;Graphene;Ions;Nickel oxide;Reduced Graphene Oxide;Wood;Conductive carbon fiber;Electrochemical performance;Electronic conductivity;Gravimetric capacity;Initial Coulombic efficiency;Initial discharge capacities;Nickel oxides (NiO);Reduced graphene oxides (RGO);Lithium-ion batteries
摘要：
In general, biomass-derived carbon or nickel oxide (NiO) served individually as anode materials for lithium ion batteries suffers from insuperable barriers due to severe defects, i.e. low specific capacity for carbon anodes, low electronic conductivity and large volume expansions for NiO anodes during cycling, etc. Herein, we proposed a strategy that combines wood-derived hollow carbon fibers with around 35 wt% nano NiO wrapped by the reduced graphene oxide (rGO). This unique structure fully integrates the merits of porous and conductive carbon fiber skeletons, high gravimetric capacity of NiO, and highly flexible and conductive rGO, exhibiting superior electrochemical performance than the CF and CF@NiO composite. CF@NiO@rGO exhibits an initial discharge capacity of 1062.3 mAh g−1, and charge capacity of 684.1 mAh g−1, resulting in the initial coulombic efficiency of 64.4%. Remarkably, as the current density increases to 2 A g−1, the CF@NiO@rGO delivers a reversible capacity of 333 mA h g−1, and 148.9 mA h g−1 is still retained at 1 A g−1 after 1000 cycles. © 2020 Elsevier B.V.
语种：
英文
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Three-dimensional "skin-framework" hybrid network as electroactive material platform for high-performance solid-state asymmetric supercapacitor
作者：
Xia, Liaoyuan* ;Hu, Shaoheng;Zhang, Xueqin;Huang, Le;Liao, Yu;...
期刊：
RSC Advances ,2019年9(23):12877-12885 ISSN：2046-2069
通讯作者：
Xia, Liaoyuan;Wu, Yiqiang;Lu, Xihong
作者机构：
[Huang, Le; Wu, Yiqiang; Liao, Yu; Xia, Liaoyuan; Hu, Shaoheng; Zhang, Xueqin; Qing, Yan; Jiang, Wenping; Xia, LY] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Huang, Le; Liao, Yu; Xia, Liaoyuan; Hu, Shaoheng; Zhang, Xueqin] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.;[Lu, Xihong] Sun Yat Sen Univ, Sch Chem, MOE, Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.
通讯机构：
[Xia, LY; Wu, YQ; Xia, Liaoyuan] C;[Lu, Xihong] S;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.;Sun Yat Sen Univ, Sch Chem, MOE, Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.
摘要：
Three-dimensional (3D) electrode materials are ideal candidates for use in fabricating high-performance supercapacitors (SCs), owing to their unique network structure and excellent electrochemical properties. In this study, an aerogel film produced by the freeze-drying self-aggregation of multiwall carbon nanotubes (MWCNTs) and cellulose nanofibers (CNFs) served as the "skin", and an inter-connected 3D network of nickel foam (NF) as the "framework", for the fabrication of an MWCNT/CNF-NF (called MCN) hybrid material with a distinct "skin-framework" architecture. Considering the metrics of excellent conductivity, high wettability, binder-free and unique 3D "skin-framework" structure, the MCN hybrid material has great potential as an electroactive material platform in constructing state-of-the-art asymmetric supercapacitor (ASC) electrodes. By incorporating MCN with electroactive manganese dioxide (MnO2) and active carbon (AC), MnO2-MCN and AC-MCN composite electrodes with respective high areal capacitances of 1784.8 (equal to 469.7 F g-1) and 868.8 mF cm-2 (equal to 126.3 F g-1) at 5 mA cm-2 were successfully prepared. Further, both kinds of electrodes exhibited high charge/discharge ability rates and good cycle performance. Moreover, an optimally assembled MnO2-MCN//AC-MCN solid-state ASC was reversibly charged/discharged at voltages as high as 1.8 V and possessed a remarkable volumetric capacity of 9.83 F cm-3 and an energy density of 4.25 mW h cm-3, as well as good cycle stability. © 2019 The Royal Society of Chemistry.
语种：
英文
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A study on the tunable emission induced by energy transfer in rare-earth-free calcite- and vaterite-type CaCO3 co-doped with Sn2+ and Mn2+ phosphors
作者：
Xu, Qingqing;Tong, Xubo;Han, Jin;Zhang, Xinmin*
期刊：
Journal of Alloys and Compounds ,2019年807:151699 ISSN：0925-8388
通讯作者：
Zhang, Xinmin
作者机构：
[Xu, Qingqing; Han, Jin; Tong, Xubo; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.
关键词：
Calcite;Calcium carbonate;Color;Crystal structure;Emission spectroscopy;Energy transfer;Phosphors;Photoluminescence;Precipitation (chemical);Rare earths;Scanning electron microscopy;X ray powder diffraction;Color tunable;Coordination environment;Energy transfer mechanisms;Fluorescence lifetimes;Photoluminescence properties;Rare-earth-free;Scanning electron microscopy image;Visible spectral regions;Manganese compounds
摘要：
Development of rare-earth-free phosphors is quite significant. It is well known that luminescence of Sn2+ depends strongly on the structure of the host crystal. The emission of Mn2+ is often very weak due to forbidden 4T1 → 6A1 transition. However, it can be enhanced by means of energy transfer. This work deals with the photoluminescence of calcite- and vaterite-type CaCO3 doped with Sn2+, Mn2+ phosphors. The phosphor particles were prepared via a simple co-precipitation method. The phase purity of the synthesized particles was determined by X-ray powder diffraction. Scanning electron microscopy images were obtained to study the particle morphology. Photoluminescence properties were determined by recording the emission spectra and excitation spectra. Furthermore, the fluorescence lifetimes were recorded to investigate decay and energy transfer behavior of the samples. The emission colors of calcite-CaCO3:Sn2+ and vaterite-CaCO3:Sn2+ are different under 254 nm UV excitation, which is explained by the different coordination environment of Ca2+. For the Sn2+-Mn2+ co-doped samples, the emission intensity of Mn2+ becomes stronger than that of Mn2+ singly doped sample, which is attributed to Sn2+ → Mn2+ energy transfer. Inokuti-Hirayama model is used to analysis of the involved energy transfer mechanism. The color tone of the samples can be tuned in the visible spectral region through adjusting the Mn2+ doping concentration. Near cold white-light emission can also be achieved in a single host co-doped with Sn2+ and Mn2+. © 2019 Elsevier B.V.
语种：
英文
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Investigation of site occupancy and photoluminescence of Ce3+ in cubic borate Ba3Y2(B2O5)3 and Ce3+ → Tb3+ energy transfer behavior
作者：
Wu, Pianpian;Tong, Xubo;Xu, Yang;Han, Jin;Seo, Hyo Jin;...
期刊：
Optical Materials ,2019年91:246-252 ISSN：0925-3467
通讯作者：
Zhang, Xinmin
作者机构：
[Xu, Yang; Han, Jin; Tong, Xubo; Wu, Pianpian; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.;[Seo, Hyo Jin] Pukyong Natl Univ, Dept Phys & Interdisciplinary, Program Biomed Mech & Elect Engn, Busan 608737, South Korea.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.
关键词：
Barium compounds;Energy transfer;Phosphors;Photoluminescence;Sol-gels;Terbium compounds;X ray diffraction analysis;Borate;Dipole dipole interactions;Energy transfer process;Green emission peaks;Interaction mechanisms;Luminescence decay curve;Photoluminescence emission;Site occupancy;Cerium compounds
摘要：
Ce3+, Tb3+ and Ce3+-Tb3+ activated Ba3Y2(B2O5)3 phosphors were synthesized by a sol-gel pyrolysis method. The synthesized phosphors were investigated using X-ray diffraction (XRD) analysis, photoluminescence emission and excitation spectra and luminescence decay curves. In the Ce3+ activated Ba3Y2(B2O5)3 samples, two different Ce3+ centers (marked as Ce(1) and Ce(2)) could exist. The Ba3Y2(B2O5)3:Tb3+ phosphor shows some emission peaks at ∼350–650 nm among which the green emission peak at 540 nm is the strongest. For the Ba3Y2(B2O5)3:Ce3+, Tb3+ co-doped phosphor, the existence of energy transfer process from Ce3+ center to Tb3+ center is confirmed and the interaction mechanism between Ce3+ and Tb3+ in Ba3Y2(B2O5)3:Ce3+,Tb3+ system is dipole-dipole interaction based on Inokuti–Hirayama (I–H) model. © 2019 Elsevier B.V.
语种：
英文
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Spectroscopic properties of red-emitting phosphor series (Y4-xEux)Zn4(SiO4)5 (x = 0.004–4) based on the site occupation of Eu3+ ion
作者：
Tong, Xubo;Han, Jin;Zhang, Xinmin*
期刊：
Optical Materials ,2019年95:109236 ISSN：0925-3467
通讯作者：
Zhang, Xinmin
作者机构：
[Han, Jin; Tong, Xubo; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.
关键词：
Crystal atomic structure;Crystal symmetry;Emission spectroscopy;Europium compounds;Ions;Phosphors;Photoluminescence;Quenching;Silicates;X ray powder diffraction;Zinc compounds;Concentration dependence;Concentration quenching;Electric dipole transition;High temperature solid state methods;Magnetic dipole transition;Photo-luminescence excitation;Site symmetry;Spectroscopic property;Yttrium compounds
摘要：
Y4Zn4(SiO4)5 silicate doped with Eu3+ ions was prepared by the high temperature solid state method. The phase purity of phosphor series (Y4-xEux)Zn4(SiO4)5 (0.004 ≤ x ≤ 4) was checked by X-ray diffraction. The crystal structure, interatomic distances, and atom coordination numbers of Eu4Zn4(SiO4)5 were determined using x-ray powder diffraction. A study of the luminescent properties of (Y4-xEux)Zn4(SiO4)5 was carried out employing photoluminescence excitation and emission spectra and luminescence decay. The occupied sites of Eu3+ ions, relative intensity between magnetic dipole transition and electric dipole transition and the 7FJ levels splitting by the crystal field were discussed in terms of a low symmetry site of Y3+ ion in the Y4Zn4(SiO4)5 host lattice. The concentration quenching of Eu3+ luminescence was also investigated from the concentration dependence of the decay time measured for Eu3+ 5D0 → 7F1,2 luminescence. © 2019 Elsevier B.V.
语种：
英文
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Efficient energy transfer induced tunable emission in Ce3+ and Eu2+ co-doped Ba1.2Ca0.8SiO4 phosphor
作者：
Tong, Xubo;Han, Jin;Cheng, Zhe;Wu, Pianpian;Zhang, Xinmin*
期刊：
Journal of Luminescence ,2019年215:116670 ISSN：0022-2313
通讯作者：
Zhang, Xinmin
作者机构：
[Cheng, Zhe; Han, Jin; Tong, Xubo; Wu, Pianpian; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.
关键词：
Barium compounds;Calcium compounds;Doppler effect;Energy efficiency;Energy transfer;Light emission;Light emitting diodes;Phosphors;Photoluminescence spectroscopy;Red Shift;Silicates;Solid state reactions;Supercomputers;Thermodynamic stability;Color tunable;Correlated color temperature;Dipole interaction;Efficient energy transfer;Energy transfer mechanisms;Fluorescence decays;Red emitting phosphor;White light emitting diodes;Europium compounds
摘要：
A series of Ce3+ and/or Eu2+ doped T-phase orthosilicate Ba1.2Ca0.8SiO4 (BCS) phosphors were synthesized by conventional solid state reaction. The as-synthesized samples were investigated by X-ray diffraction (XRD), photoluminescence spectroscopy, and fluorescence decay curve. The red shifts of emission peak were observed in Ce3+ and/or Eu2+ doped BCS phosphors. The possible rationalization for the red shift was discussed. The emission color for BCS:Ce3+, Eu2+ phosphors can be turned from deep blue to bluish green by varying Eu2+ concentration. The efficient energy transfer from Ce3+ to Eu2+ is responsible for this phenomenon. The energy transfer mechanism was validated and demonstrated to be a resonant type via a dipole–dipole interaction by using Inokuti–Hirayama model and Dexter's energy transfer theory. In addition, the thermal stability of the phosphors is also investigated. Furthermore, the quantum efficiency (QE) of Ba1.15Ca0.8SiO4:0.02Ce3+, 0.02Na+, 0.01Eu2+ phosphor was found to be 38.77%. Finally, to explore the practical applications of obtained compounds for indoor illumination, a white light-emitting-diode (LED) device which contained a n-UV chip, prepared phosphors, and green emitting and red emitting phosphors was packaged. The packaged white LEDs device can emit dazzling white light with satisfied color coordinate of (0.350, 0.335), Ra (84), and correlated color temperature (4744 K). © 2019 Elsevier B.V.
语种：
英文
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Carbon nanotubes grown on the inner wall of carbonized wood tracheids for high-performance supercapacitors
作者：
Wu, Chenling;Zhang, Sen;Wu, Wei;Xi, Zhaowei;Zhou, Cui* ;...
期刊：
Carbon ,2019年150:311-318 ISSN：0008-6223
通讯作者：
Zhou, Cui;Luo, Yongfeng
作者机构：
[Zhang, Sen; Xi, Zhaowei; Wang, Xin; Bai, Yuanjuan; Wu, Wei; Liu, Gonggang; Zhang, Xiang; Zhou, Cui; Deng, Yuanyuan; Wu, Chenling; Luo, Yongfeng; Li, Xianjun] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface & Interface Sci &, Coll Sci, Mat Sci & Engn Sch, Changsha 410004, Hunan, Peoples R China.;[Chen, Daoyong; Luo, Yongfeng] Fudan Univ, State Key Lab Mol Engn Polymers, Shanghai 200433, Peoples R China.
通讯机构：
[Zhou, C; Luo, YF] C;Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface & Interface Sci &, Coll Sci, Mat Sci & Engn Sch, Changsha 410004, Hunan, Peoples R China.
关键词：
Carbon nanotubes;Supercapacitor;Wood carbon slice;Wood scraps
摘要：
Supercapacitors made by wood scraps are low cost, ecofriendly and accessible. However, there are some problems, such as a small specific surface area and low specific capacitance. How to obtain a high-performance supercapacitor by effectively increasing the specific surface area without affecting the conductivity is still a challenge. In this paper, carbon nanotubes (CNTs) were first synthesized on the inner wall of tracheids in wood carbon slices, which have complete structures and do not require any conductive additives and binder. Nanonickel particles as catalysts were uploaded on the inner wall of each tracheid for growing the CNTs, which can increase the specific surface area from 365.5 to 537.9 m2 g−1, while improving the electrochemical performance to 215.3 F g−1 or 76.5 F cm−3. The energy density of the all-solid-state supercapacitor is 39.8 Wh kg−1, and 96.2% of the capacitance could still be retained after 10,000 charging/discharging cycles. This capacitance value is approximately five times as high as that of activated wood carbon and is equal to or higher than that of supercapacitors based on wood carbon slices with pseudocapacitance materials. CNTs will greatly promote the application of wood scraps as valuable commodities. © 2019 Elsevier Ltd
语种：
英文
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Color tunable emission from CaS:Cu+, Mn2+ rare-earth-free phosphors prepared by a simple carbon-thermal reduction method
作者：
Tong, Xubo;Yang, Jiaxin;Wu, Pianpian;Zhang, Xinmin* ;Seo, Hyo Jin
期刊：
Journal of Alloys and Compounds ,2019年779:399-403 ISSN：0925-8388
通讯作者：
Zhang, Xinmin
作者机构：
[Tong, Xubo; Yang, Jiaxin; Wu, Pianpian; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.;[Seo, Hyo Jin] Pukyong Natl Univ, Dept Phys, Busan 608737, South Korea.;[Seo, Hyo Jin] Pukyong Natl Univ, Interdisciplinary Program Biomed Mech & Elect Eng, Busan 608737, South Korea.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.
关键词：
Calcium compounds;Carbon;Color;Copper compounds;Emission spectroscopy;Energy transfer;Manganese compounds;Phosphors;Photoluminescence;Rare earths;Band emission;Carbon-thermal reduction;Color tunable;Doping concentration;Emission spectrums;Excitation spectrum;Photoluminescence properties;Rare-earth-free;Sulfur compounds
摘要：
Photoluminescence properties of CaS:Cu+, CaS:Mn2+ and CaS:Cu+, Mn2+ rare-earth -free phosphors prepared by a carbon-thermal reduction method were investigated. The emission spectrum of Cu+-doped CaS consists of two overlapped bands peaking at 415 nm (attributed to isolated Cu+ activator) and 475 nm (attributed to aggregated Cu+ center). The influence of Cu+ doping concentration on the emission spectrum is discussed. The emission spectrum of Mn2+-doped CaS exhibits a band emission peaking at 568 nm under 250 nm excitation. The emission spectra of the doubly activated CaS:Cu+, Mn2+ phosphors consist of Cu+ and Mn2+ emissions simultaneously, and their shapes depend strongly on the Mn2+ concentration. Based on the emission and excitation spectra of the CaS:0.15 mol%Cu+, xMn2+ phosphors, the energy transfer from Cu+ to Mn2+ takes place. The emitting colors of the doubly activated phosphors can also be tuned. In particular, the emitting color of CaS:0.15 mol% Cu+, 0.6 mol % Mn2+ sample is close to white light. © 2018 Elsevier B.V.
语种：
英文
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Computational exploration of reactive fragment for mechanism-based inhibition of xanthine oxidase
作者：
Du, Ye;Liu, Ziye;Qiao, Fangfang;Wang, Shunyang;Chen, Kai* ;...
期刊：
Journal of Organometallic Chemistry ,2018年864:58-67 ISSN：0022-328X
通讯作者：
Zhang, Xinhao;Chen, Kai
作者机构：
[Qiao, Fangfang; Zhang, Xinhao; Wang, Shunyang; Du, Ye; Liu, Ziye] Peking Univ, Shenzhen Grad Sch, Key Lab Chem Gen, Lab Computat Chem & Drug Design, Shenzhen 518055, Peoples R China.;[Chen, Kai] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Wang, Shunyang] Shandong Univ, Sch Ocean, Weihai 264209, Peoples R China.
通讯机构：
[Zhang, Xinhao] P;[Chen, Kai] C;Peking Univ, Shenzhen Grad Sch, Key Lab Chem Gen, Lab Computat Chem & Drug Design, Shenzhen 518055, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Addition reactions;Amino acids;Design for testability;Enthalpy;Hydrides;Mechanisms;Molecules;Molybdenum;Substrates;Activation enthalpies;Catalytic mechanisms;Computational exploration;Drug Design;Mechanistic studies;Nucleophilic additions;Rate determining step;Xanthine oxidase;Molybdenum compounds
摘要：
The xanthine oxidase (XO) family is a group of molybdenum-containing enzymes that catalyze the transfer of an oxygen atom from water to a substrate, such as xanthine or aldehyde. The proposed mechanism for the reductive half-reaction of xanthine oxidase involves nucleophilic addition of Mo-bound hydroxide to the substrate and hydride transfer from the substrate to sulfido group (Mo=S) at the molybdenum cofactor (Moco) reaction center. A DFT study of a mechanism involving the near-by glutamic acid (Glu) residue for the oxidation of several model substrates found that the direct involvement of the Glu residue side chain significantly increases the reactivity of the cofactor. The reaction is stepwise with a hydride transfer as the rate determining step. On the basis of mechanistic studies, a QM model was established to search the potential reactive fragments for mechanism-based inhibitors. Two important parameters were designed to evaluate each fragment: the activation enthalpy (ΔH≠) which estimates how effectively an inhibitor competes with xanthine to react with the Moco site, and the enthalpy associated with release of the product (ΔH) which estimates how easily the product in product complex (PRO) could be replaced by a water molecule. The computational findings add to our understanding of the catalytic mechanism of xanthine oxidase, and also assist the screening of mechanism-based inhibitors for this important drug target. © 2018 Elsevier B.V.
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英文
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Facile Synthesis of Highly Dispersed Ag Doped Graphene Oxide/Titanate Nanotubes as a Visible Light Photocatalytic Membrane for Water Treatment
作者：
Liu, Gonggang;Han, Kai;Zhou, Yonghua;Ye, Hongqi;Zhang, Xiang;...
期刊：
ACS SUSTAINABLE CHEMISTRY & ENGINEERING ,2018年6(5):6256-6263 ISSN：2168-0485
通讯作者：
Hu, Jinbo;Li, Xianjun
作者机构：
[Hu, Jinbo; Li, Xianjun; Hu, JB; Li, XJ; Liu, Gonggang; Zhang, Xiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Ye, Hongqi; Han, Kai; Zhou, Yonghua] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China.;[Hu, Jinbo; Li, Xianjun; Hu, JB; Li, XJ] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Hu, JB; Li, XJ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.
关键词：
Graphene oxide membranes;Membrane fouling;Visible light;Photocatalytic degradation;Ag;Titanate nanotubes
摘要：
Graphene oxide (GO) membranes have attracted extensive interest due to their ultrathin thickness, high flux, pore size tunability, superior flexibility, and energy-efficient properties for transporting ions and molecules through the unique 2D channels. Nevertheless, membrane fouling leading to membrane blocking and poor water flux of GO membranes during long-term use are major obstacles for water treatment or desalination applications. In this work, Ag doped GO/titanate nanotube (Ag/GO/TNT) membranes with enhanced visible light degradation ability were fabricated by a single-step procedure to resolve the fouling problem via integration of photocatalysis with membrane filtration. The results show that the Ag nanoparticles could be highly dispersed on the surface of GO and TNTs. And, the as-prepared Ag/GO/TNT membranes exhibited reasonable ability on photocatalytic degradation of Methylene Blue under visible light. We found that 90% of MB could be effectively degraded after 120 min irradiation with 8 mg of photocatalyst. More importantly, the membrane fouling could be effectively alleviated with visible light irradiation. In coupling the photocatalysis and membrane separation processes, the flux of Ag/GO/TNT membranes with the GO and TNT ratio at 1:3 and Ag content of 6% could be maintained at 34.7 L/m2 h which doubles that of membrane filtration without visible light irradiation. In addition, Ag/GO/TNT membranes possess high acid-alkali resistance stability and good compressive strength. These results have provided a simple preparation strategy to obtain highly dispersed nanoparticles and valuable insight into endowing membranes with visible light degradation ability for solving the problem of GO based membrane fouling. © 2018 American Chemical Society.
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英文
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On the photoluminescence of multi-sites Ce3+ in T-phase orthosilicate and energy transfer from Ce3+ to Tb3+
作者：
Tong, Xubo;Zhang, Xinmin* ;Wu, Luyi;Zhang, Hongzhi;Seo, Hyo Jin
期刊：
Journal of Alloys and Compounds ,2018年748:871-875 ISSN：0925-8388
通讯作者：
Zhang, Xinmin
作者机构：
[Wu, Luyi; Tong, Xubo; Zhang, Hongzhi; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Seo, Hyo Jin] Pukyong Natl Univ, Dept Phys, Busan 608737, South Korea.;[Seo, Hyo Jin] Pukyong Natl Univ, Interdisciplinary Program Biomed Mech & Elect Eng, Busan 608737, South Korea.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Cerium compounds;Emission spectroscopy;Energy transfer;Excited states;Phosphors;Photoluminescence;Silicon;Solid state reactions;Absorption peaks;Crystallographic sites;Emission intensity;Emission spectrums;Excitation spectrum;Orthosilicate;Site occupation;Spectral region;Fluorine compounds
摘要：
Ce3+, Tb3+ co-doped T-phase orthosilicate Ba1.2Ca0.8SiO4 phosphors were prepared by means of solid state reactions. The synthesized samples were investigated using XRD and PL emission and excitation spectra. The emission spectra for Ce3+ doped Ba1.2Ca0.8SiO4 phosphors show broad bands in the 320–550 nm spectral region. The excitation spectra exhibit several absorption peaks in the range of 250–400 nm. Both the emission and excitation spectra are dependent on the excitation or monitoring wavelengths. We attribute these results to Ce3+ ions occupying two different crystallographic sites (i.e., Ce I and Ce II). The Ce3+, Tb3+ co-doped Ba1.2Ca0.8SiO4 phosphors show Tb3+-related line emissions in the 475–600 nm spectral region and Ce3+-related band emissions in the 350–525 nm spectral region when the 4f → 5d transition of Ce3+ is excited (λex = 345 nm), indicating that energy transfer from Ce3+ to Tb3+ takes place. Moreover, the emission intensity of 5D4 → 7F5 transition for Ba1.00Ce0.02Tb0.08Li0.10Ca0.8SiO4 is 30 times stronger than that of Ba1.04Tb0.08Li0.08Ca0.8SiO4 sample under 345-nm UV excitation. © 2018 Elsevier B.V.
语种：
英文
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N-doped defective carbon with trace Co for efficient rechargeable liquid electrolyte-/all-solid-state Zn-air batteries
作者：
Chen, Zhiyan;Wang, Qichen;Zhang, Xiaobin;Lei, Yongpeng* ;Hu, Wei;...
期刊：
科学通报(英文版) ,2018年63(9):548-555 ISSN：2095-9273
通讯作者：
Lei, Yongpeng;Wang, Yaobing
作者机构：
[Wang, Qichen; Chen, Zhiyan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Chsangsha 410004, Peoples R China.;[Wang, Qichen] Donghua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.;[Zhang, Xiaobin] Japan Adv Inst Sci & Technol, Ctr Nano Mat & Technol, 1-1 Asahidai, Nomi, Ishikawa 9231292, Japan.;[Lei, Yongpeng] Cent South Univ, Sch Aeronaut & Astronaut, Changsha 410083, Hunan, Peoples R China.;[Lei, Yongpeng] Cent South Univ, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Lei, Yongpeng; Wang, Yaobing] C;[Lei, Yongpeng] N;Cent South Univ, Sch Aeronaut & Astronaut, Changsha 410083, Hunan, Peoples R China.;Cent South Univ, Sci & Technol High Strength Struct Mat Lab, Changsha 410083, Hunan, Peoples R China.;Natl Univ Def Technol, Coll Basic Educ, Changsha 410073, Hunan, Peoples R China.
关键词：
Defect;Oxygen electrocatalysts;Rechargeable all-solid-state batteries
摘要：
Simple synthesis of multifunctional electrocatalysts with plentiful active sites from earth-abundant materials is especially fascinating. Here, N-doped defective carbon with trace Co (1.5 wt%) was prepared via a scalable one pot solid pyrolysis process. The sample exhibits efficient bifunctional OER/ORR activity in alkaline, mainly ascribed to the unique micro-mesoporous structure (1–3 nm), high population of graphitic-N doping (up to 49.0%), abundant defects and the encapsulated Co nanoparticles with graphitized carbon. The according rechargeable liquid Zn-air batteries showed excellent performance (maximum power density of 154.0 mW cm−2; energy density of 773 Wh kg−1 at 5 mA cm−2 and charging-discharging cycling stability over 100 cycles). As a proof-of-concept, the flexible, rechargeable all-solid-state Zn-air batteries were constructed, and displayed a maximum power density as high as 45.9 mW cm−2, among the top level of those reported previously. © 2018 Science China Press
语种：
英文
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Recent Progress in Flexible Fibrous Batteries
作者：
Xi, Zhaowei;Zhang, Xiang;Ma, Yuansheng;Zhou, Cui;Yang, Jing;...
期刊：
ChemElectroChem ,2018年5(21):3127-3137 ISSN：2196-0216
通讯作者：
Luo, Yongfeng;Chen, Daoyong
作者机构：
[Zhou, Cui; Luo, Yongfeng; Chen, Daoyong; Xi, Zhaowei; Wu, Yiqiang; Ma, Yuansheng; Yang, Jing; Li, Xianjun; Zhang, Xiang] Cent South Univ Forestry & Technol, Mat Sci & Engn Sch, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Xi, Zhaowei; Luo, Yongfeng] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Guangdong, Peoples R China.;[Luo, Yongfeng; Chen, Daoyong] Fudan Univ, Dept Macromol Sci, State Key Lab Mol Engn Polymers, Shanghai 200433, Peoples R China.
通讯机构：
[Luo, YF; Chen, DY] C;[Luo, Yongfeng; Luo, YF; Chen, DY] F;Cent South Univ Forestry & Technol, Mat Sci & Engn Sch, Coll Sci, Changsha 410004, Hunan, Peoples R China.;Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Guangdong, Peoples R China.;Fudan Univ, Dept Macromol Sci, State Key Lab Mol Engn Polymers, Shanghai 200433, Peoples R China.
关键词：
flexible fibrous batteries;lithium-ion batteries;metal-air batteries;lithium-sulfur batteries;wearable devices
摘要：
Flexible fibrous batteries have attracted unprecedented attention, owing to the development of wearable electronic devices, which have the advantages of flexibility, weavability, and miniaturization compared with conventional bulky batteries. In this Minireview, we summarize the latest developments in flexible fibrous batteries, including lithium-ion batteries, lithium–sulfur batteries, sodium-ion batteries, and so forth. We also discuss the future directions and challenges of flexible fibrous batteries. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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Photoluminescence properties and site-preferable distribution of Ce3+ in Na2Ca1-xSrxSi2O6 (x = 0–1) blue-emitting phosphors
作者：
Zhang, Hongzhi;Zhang, Xinmin* ;Cheng, Zhe;Xu, Yang;Yang, Jiaxin;...
期刊：
Journal of Alloys and Compounds ,2018年764:853-860 ISSN：0925-8388
通讯作者：
Zhang, Xinmin
作者机构：
[Xu, Yang; Cheng, Zhe; Meng, Fangui; Yang, Jiaxin; Zhang, Hongzhi; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
High temperature applications;Ions;Light emission;Phosphors;Rietveld refinement;Silicates;Solid state reactions;Blue-emitting phosphor;Color tunable;High temperature solid-state reaction;Na2Ca1-xSrxSi2O6:Ce^3+;Photoluminescence properties;Redistribution of activator;Site occupancy;Trigonal crystals;Strontium compounds
摘要：
Two Ce3+ doped sodium strontium (calcium) silicates, Na2SrSi2O6:Ce3+ and Na2CaSi2O6:Ce3+, were prepared by high temperature solid state reaction. They both crystallize in trigonal crystal system with space group R3¯m. Substitution of three independent Ca2+ sites for Ce3+ ions yields blue emission when excited by UV light (λex = 352 nm). Accordingly, Ce3+ ions occupying two distinct Sr2+ sites generate UV to blue light under 300-nm UV excitation. A series of Na2Ca1-xSrxSi2O6:Ce3+ (x = 0–1) were prepared. All the samples form solid solutions and are isotypic confirmed by Rietveld refinements. Increasing Sr2+ content leads to asymmetrical blue shift of PL spectra. Refinement results clarify preferable site occupancy of Sr2+ in Na2CaSi2O6 compound which results in the irregular shift. The migration of Ce3+ ions between M3 and M4 sites is the key point of this phenomenon. This mechanism could be a guideline to optimize the emissions of emitting centers with multiple sites. © 2018 Elsevier B.V.
语种：
英文
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Tunable luminescence of K2MgSi3O8:Ce3+, Tb3+ phosphors through energy transfer
作者：
Zhang, Hongzhi;Zhang, Xinmin* ;Cheng, Zhe;Xu, Yang;Yang, Jiaxin;...
期刊：
Ceramics International ,2018年44(2):2547-2551 ISSN：0272-8842
通讯作者：
Zhang, Xinmin
作者机构：
[Xu, Yang; Cheng, Zhe; Meng, Fangui; Yang, Jiaxin; Zhang, Hongzhi; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Energy transfer;Phosphors;Photoluminescence;Silicate
摘要：
A series of K2MgSi3O8:xCe3+ (x = 0.01–0.09), K2MgSi3O8:0.05Ce3+, yTb3+ (y = 0–0.09) phosphors was prepared by solid-state method. X-ray diffraction was used to determine the crystal phase. Luminescence properties were characterized by photoluminescence (PL), photoluminescence excitation (PLE) spectra at room temperature. K2MgSi3O8:xCe3+ series emits blue light when excited by UV-light (λex = 350 nm). Nonequivalent substitution of K+ for Ce3+ leads to the multiple Ce3+ centers in the compound. K2MgSi3O8:Ce3+, Tb3+ exhibits broad band emission of Ce3+ and the characteristic line emission of Tb3+. The luminescence color could be tuned from blue (0.16, 0.10) to greenish blue (0.19, 0.26) by varying Tb3+ content. The energy transfer has been confirmed to occur via quadrupole-quadrupole interaction. These results indicate that the K2MgSi3O8:Ce3+, Tb3+ phosphor might be a promising material for w-LEDs application. © 2017 Elsevier Ltd and Techna Group S.r.l.
语种：
英文
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Temperature dependent of luminescence and decay behavior of Eu2+ in NASICON-type phosphate CaZr4(PO4)6
作者：
Wu, Luyi;Zhang, Hongzhi;Zheng, Wei;Zhang, Xinmin* ;Seo, Hyo Jin*
期刊：
Materials Research Bulletin ,2017年93:245-250 ISSN：0025-5408
通讯作者：
Zhang, Xinmin;Seo, Hyo Jin
作者机构：
[Wu, Luyi; Zheng, Wei; Zhang, Hongzhi; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Seo, Hyo Jin] Pukyong Natl Univ, Dept Phys, Busan 608737, South Korea.;[Seo, Hyo Jin] Pukyong Natl Univ, Interdisciplinary Program Biomed Mech & Elect Eng, Busan 608737, South Korea.
通讯机构：
[Zhang, Xinmin] C;[Seo, Hyo Jin] P;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Pukyong Natl Univ, Dept Phys, Busan 608737, South Korea.;Pukyong Natl Univ, Interdisciplinary Program Biomed Mech & Elect Eng, Busan 608737, South Korea.
关键词：
Activation energy;Luminescence;Phosphors;Photoluminescence;Quenching;Temperature distribution;CaZr4(PO4)6:Eu2+;Decay;Increasing temperatures;Photoluminescence properties;Quenching temperatures;Temperature dependence;Temperature dependent;Temperature quenching;Europium
摘要：
The temperature dependence of photoluminescence properties and decay times in the range 10–300K is reported for Eu2+ doped NASICON-type phosphate CaZr4(PO4)6. Luminescence from the Eu2+ impurity has been investigated. Two different Eu2+ centers have been detected in the host structure, 3a and 3b, corresponding to the emission bands peaking at 531 and 480nm. The emission intensity and lifetimes decrease with increasing temperature due to temperature quenching. The values of Stokes shift, quenching temperature T1/2 and activation energy for thermal quenching are evaluated. The mechanism of thermal quenching is also discussed. © 2017 Elsevier Ltd
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英文
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