1. State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices; South China University of Technology; Guangzhou 510640 China
2. Shenzhen China Star Optoelectronics Technology Co., Ltd; Shenzhen 518132 China
3. TCL Corporate Research; Shenzhen 518052 China
4. Department of Organic Device Engineering; Graduate School of Science and Engineering; Yamagata University; 4-3-16 Jonan Yonezawa Yamagata 992-8510 Japan