[Zhu, Yelin; Wang, Xinzhong] Shenzhen Inst Informat Technol, Sch Elect Commun Technol, Shenzhen 518172, Peoples R China.
[Zhou, Shuxing] Hubei Univ Arts & Sci, Hubei Key Lab Low Dimens Optoelect Mat & Devices, Xiangyang 441053, Peoples R China.
[Zhu, Yelin; Zhu, Jian; Wang, Ping] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.
[Hu, Guangzhi; Jia, Xiuxiu] Yunnan Univ, Inst Ecol Res & Pollut Control Plateau Lakes, Sch Ecol & Environm Sci, Kunming 650504, Peoples R China.
[Wagberg, Thomas; Hu, Guangzhi] Umea Univ, Dept Phys, S-90187 Umea, Sweden.