1. Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 People's Republic of China
2. Tianjin Key Laboratory of Molecular Optoelectronic Science School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Tianjin 300072 P. R. China
3. Department of Physics and Center for Optoelectronics and Photonics Paderborn (CeOPP) Universität Paderborn Warburger Strasse 100 Paderborn 33098 Germany
4. Wyant College of Optical Sciences University of Arizona Tucson AZ 85721 United States