1. Department of Physics The Chinese University of Hong Kong New Territories Hong Kong 999077 China
2. State Key Laboratory of Modern Optical Instrumentation Center for Chemistry of High‐Performance & Novel Materials Department of Chemistry Zhejiang University Hangzhou Zhejiang 310030 China
3. School of Materials Science and Engineering Peking University Beijing 100871 China
4. School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore 639798 Singapore
5. Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research, Center for Tissue Restoration & Reconstruction Hong Kong University of Science and Technology (HKUST) Clear Water Bay Hong Kong 999077 China
6. Department of Electronic Engineering The Chinese University of Hong Kong New Territories Hong Kong 999077 China
7. Fluorescence Research Group Singapore University of Technology and Design Singapore 487372 Singapore
8. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China