1. Department of ChemistryHubei Key Lab on Organic and Polymeric Optoelectronic MaterialsWuhan University Wuhan 430072 P. R. China
2. Department of Electrical EngineeringGraduate Institute of Electronics Engineering and Graduate Institute of Photonics and OptoelectronicsNational Taiwan University Taipei 10617 Taiwan
3. College of Materials Science and EngineeringShenzhen Key Laboratory of Polymer Science and TechnologyShenzhen University Shenzhen 518060 P. R. China