1. Micro LED Research Center; Korea Photonics Technology Institute; Gwangju 500-779 South Korea
2. Department of Energy Systems Engineering; Chung Ang University; Seoul 06974 South Korea
3. Department of Biomedical Chemistry, College of Biomedical & Health Science, Nanotechnology Research Center; Konkuk University; Chungju-si 27478 Republic of Korea
4. Department of Nano Science & Mechatronics Engineering, Nanotechnology Research Center; Konkuk University; Chungju-si 27478 Republic of Korea