1. Institute of New Energy Technology Department of Electronic Engineering College of Information Science and Technology Jinan University Guangzhou 510632 China
2. Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China
3. Catalonia Institute for Energy Research – IREC Sant Adrià de Besòs Barcelona 08930 Spain
4. Catalan Institution for Research and Advanced Studies – ICREA Pg. Lluís Companys 23 Barcelona 08010 Spain