1. College of Physics Science & Technology; Shenzhen University; Shenzhen 518060 China
2. School of Materials Science and Engineering; Nanyang Technological University; Singapore 639798 Singapore
3. Division of Physics and Applied Physics and Centre for Disruptive Photonic Technologies (CDPT); School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
4. Department of Electrical and Electronic Engineering; South University of Science and Technology of China; Shenzhen Guangdong 518055 P. R. China
5. Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials (IAM); Nanjing University of Posts & Telecommunications; Nanjing 210023 Jiangsu China
6. School of Electrical and Electronic Engineering; Nanyang Technological University; Nanyang Avenue Singapore 639798 Singapore
7. Department of Electrical and Electronics Engineering; Department of Physics; UNAM - Institute of Materials Science and Nanotechnology; Ankara 06800 Turkey