1. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou P. R. China
2. Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates (South China University of Technology) Guangzhou P. R. China
3. Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong China
4. School of Energy and Environmental Science City University of Hong Kong Kowloon Hong Kong China