[1] E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China
[2] E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China
[3] Fudan Univ, Dept Phys, Shanghai 200243, Peoples R China
[4] E China Normal Univ, Minist Educ, Key Lab Polar Mat & Devices, Shanghai 200241, Peoples R China