1. Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
2. Institute of Materials for Electronics and Energy Technology (i‐MEET) Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Martensstr. 7 Erlangen 91058 Germany
3. Helmholtz Institute Erlangen‐Nürnberg for Renewable Energy (HIERN) Immerwahrstr. 2 Erlangen 91058 Germany