1. School of Optoelectronic Science and Engineering Soochow University Suzhou Jiangsu 215006 P. R. China
2. School of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou Jiangsu 215123 P. R. China
3. TCL Corporate Research Shenzhen Guangdong 518052 China
4. Key Laboratory of Luminescence and Optical Information Ministry of Education, School of Science Beijing Jiaotong University Beijing 100044 China
5. National University of Singapore Suzhou Research Institute Dushu Lake Science and Education Innovation District Suzhou Jiangsu 215123 P. R. China