1. School of Electronics and Information Technology, School of Chemistry, State Key Lab of Opto-Electronic Materials and Technologies, Guangdong Province Key Lab of Display Materials and Technologies; Sun Yat-Sen University; Guangzhou 510275 China
2. Guangzhou OED technologies Co., Ltd.; Guangzhou 511458 China
3. Department of Photonics and Institute of Electro-Optical Engineering; National Chiao Tung University; Hsinchu 300 Taiwan