1. College of Chemistry Fuzhou University Fuzhou Fujian 350116 P. R. China
2. Fujian Science & Technology Innovation Laboratory for, Optoelectronic Information of China Fuzhou Fujian 350002 P. R. China
3. State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from, Molecular Aggregates South China University of Technology Guangzhou Guangdong 510640 P. R. China