1. Department of Materials Science and Engineering and Center for Functional Photonics (CFP) City University of Hong Kong 83 Tat Chee Avenue, Kowloon Hong Kong S.A.R. 999077 P. R. China
2. State Key Lab of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy (CNRE) School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 P. R. China
3. Center for Rare Earth and Inorganic Functional Materials Tianjin Key Lab for Rare Earth Materials and Applications School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 P. R. China
4. School of Environment and Chemical Engineering Zhaoqing University Zhaoqing Guangdong 526061 P. R. China
5. Department of Materials Science and Engineering Southern University of Science and Technology 1088 Xueyuan Road Shenzhen Guangdong 518055 P. R. China
6. School of Energy and Environment and Center of Super‐Diamond and Advanced Films (COSDAF) City University of Hong Kong 83 Tat Chee Avenue, Kowloon Hong Kong S.A.R. 999077 P. R. China