1. Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences Ningbo Zhejiang 315201 P. R. China
2. Department of Materials Science and Opto‐Electronic TechnologyUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
3. School of Materials Science and EngineeringJingdezhen Ceramic Institute Jingdezhen Jiangxi 333403 P. R. China
4. Department of Chemistry and Chemical BiologyRutgersThe State University of New Jersey Piscataway NJ 08854 USA
5. School of PhysicsCollaborative Innovation Center of Advanced Microstructuresand National Laboratory of Solid State MicrostructuresNanjing University Nanjing 210093 P. R. China
6. Fujian Institute of InnovationChinese Academy of Sciences Fuzhou Fujian 350002 P. R. China
7. Shanghai Institute of Applied PhysicsChinese Academy of Sciences Shanghai 201800 P. R. China