1. College of Materials Science and Engineering; Nanjing University of Technology; Nanjing; 210009; People's Republic of China
2. Department of Optical Science and Engineering; Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education); Fudan University; Shanghai; 200433; People's Republic of China
3. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai; 200050; People's Republic of China
4. School of Electrical and Electronic Engineering; Nanyang Technological University; Singapore; 639798; Singapore
5. Temasek Laboratories; Nanyang Technological University; Singapore; 639798; Singapore