[1] Jiangnan Univ, Sch Sci, Wuxi 214122, Jiangsu, Peoples R China
[2] Jiangnan Univ, Jiangsu Prov Res Ctr Light Ind Optoelect Engn & T, Wuxi 214122, Jiangsu, Peoples R China
[3] Liaoning Univ, Sch Phys, Shenyang 110036, Peoples R China
[4] Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Jiangsu, Peoples R China