1. Institute of Optoelectronic Materials and Devices, College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310038, P. R. China
2. Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA
3. School of Materials Science and Engineering & State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China