1. MOE Key Laboratory of Bioinorganic and Synthetic Chemistry; State Key Laboratory of Optoelectronic Materials and Technology; Key Laboratory of Environment and Energy Chemistry of Guangdong Higher Education Institutes; School of Chemistry and Chemical Engineering; Sun Yat-Sen (Zhongshan) University; Guangzhou 510275 P. R. China
2. Analytical and Testing Center; South China University of Technology; Guangzhou 510641 P. R. China
3. Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 637371 Singapore