1. College
of Materials Engineering, Fujian Agriculture and Forest University, Fuzhou, Fujian 350108, P. R. China
2. College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
3. Institute
of Polymer Optoelectronic Materials and Devices, State Key Laboratory
of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China