1. Institute of Materials for Electronics and Energy Technology (i-MEET) Department of Materials Science and Engineering Friedrich-Alexander-Universität Erlangen-Nürnberg Martensstrasse 7 Erlangen 91058 Germany
2. Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (HI ERN) Immerwahrstrasse 2 Erlangen 91058 Germany
3. 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 381 Wushan Road Guangzhou 510640 P. R. China
4. Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands