1. Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong & City University of Hong Kong Shenzhen Research Institute, Shenzhen, Guangdong, P. R. China
2. Department of Physics and Institute of
Advanced Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong
SAR 999077, P. R. China
3. Center for Organic Photonics and Electronics Research
(OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
4. Nano-organic
Photoelectronic Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
5. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, P. R. China