[1] Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Dept Chem, State Key Lab Coordinat Chem, Nanjing 210093, Peoples R China
[3] Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China