1. Instistute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
2. College of Chemistry/Institute of Polymers and Energy Chemistry Nanchang University 999 Xuefu Avenue Nanchang 330031 China
3. Department of Chemistry National University of Singapore Singapore 117543 Singapore