1. Institut für Organische Chemie Universität Würzburg Am Hubland Würzburg 97074 Germany
2. Center for Nanosystems Chemistry (CNC) and Bavarian Polymer Institute (BPI) Universität Würzburg Theodor‐Boveri‐Weg Würzburg 97074 Germany
3. Institute of Polymer Optoelectronic Materials and Devices and State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China