1. SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province; College of Optoelectronic Engineering; Shenzhen University; Shenzhen 518060 P. R. China
2. Institute of Biomedicine and Biotechnology; Shenzhen Institutes of Advanced Technology; Chinese Academy of Sciences; Shenzhen 518055 P. R. China
3. Department of Physics and Materials Science; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong P. R. China