1. Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
2. Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 P. R. China
3. Department of PhysicsYunnan Key Laboratory for Micro/Nano Materials and TechnologyYunnan University Kunming 650091 P. R. China