1. Institute of Polymer Optoelectronic Materials and Devices and Key Laboratory of Special Functional Materials of Ministry of Education, South China University of Technology, Guangzhou 510640, China, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, CAS, Changchun 130022, China, and Linear Conjugated Systems Group, CNRS, CIMA, University of Angers, 2 Bd Lavoisier, Angers F-49045, France