1. School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta GA 30332‐0400 USA
2. Center for Organic Photonics and Electronics Georgia Institute of Technology Atlanta GA 30332‐0400 USA
3. Laboratory for Computational and Theoretical Chemistry of Advanced Materials King Abdullah University of Science and Technology Thuwal 23955‐6900 Kingdom of Saudi Arabia
4. School of Information Science and Engineering Shandong University Qingdao 266237 P. R. China
5. State Key Laboratory of Precision Spectroscopy School of Physics and Materials Science East China Normal University Shanghai 200062 P. R. China
6. Department of Chemistry Wuhan University Wuhan 430072 P. R. China