1. Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong SAR China
2. 6C Technology Limited Dai Hei St, Tai Po Hong Kong SAR China
3. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials and Engineering Sichuan University Chengdu 610065 China
4. Dongguan Institute of Opto‐Electronics Peking University Dongguan Guangdong 523808 China
5. School of Biomedical Sciences The University of Hong Kong Pokfulam Road Hong Kong SAR China