1. State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Wushan Road 381, Tianhe District, Guangzhou 510640, Guangdong, P. R. China
2. South China Institute of Collaborative Innovation, Dongguan 523808, China
3. TCL China Star Optoelectronics Technology Company, Ltd., Shenzhen 518132, Guangdong, P. R. China