1. Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 P. R. China
2. Department of ChemistryHubei Key Lab on Organic and Polymeric Optoelectronic MaterialsWuhan University Wuhan 430072 P. R. China
3. Key Laboratory of Luminescence and Optical InformationMinistry of EducationBeijing Jiaotong University Beijing 100044 P. R. China
4. The Institute for Advanced StudiesWuhan University Wuhan 430072 P. R. China
5. State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong University Xi'an 710049 China