1. The State Key Laboratory
of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory
of Fiber Laser Materials and Applied Techniques, School of Materials
Science and Technology, South China University of Technology, Guangzhou 510640, People’s Republic of China
2. PSL Research University, Chimie
ParisTech-CNRS, Institut de Recherche de Chimie Paris, UMR8247, 11 rue P. et M. Curie, 75005 Paris, France