1. State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices School of Materials Science and Engineering South China University of Technology Guangzhou 510640 P. R. China
2. Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates (South China University of Technology) Guangzhou 510640 P. R. China
3. Department of Physics The Chinese University of Hong Kong Shatin 999077 Hong Kong
4. Institute of Materials for Electronics and Energy Technology (i‐MEET) Department of Materials Science and Engineering Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Martensstrasse 7 91058 Erlangen Germany