1. School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054 (China), Fax: (+86) 28‐83201745
2. Center of Super‐Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Science, City University of Hong Kong, Hong Kong Special Administrative Region (China), Fax: (+852) 27847830
3. Department of Chemistry, Shantou University, Guangdong, 515063 (China)
4. Dongguan LITEWELL (OLED) Technology Incorporation, Dongguan, 523656 (China)