1. College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, China
2. College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China; Changzhou Institute of Technology Research for Solid State Lighting, Changzhou 213161, China
3. College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China; Changzhou Institute of Technology Research for Solid State Lighting, Changzhou 213161, China; Department of Microelectronics, Delft University of Technology, Delft 2628 CD, The Netherlands
4. School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China