1. Department of Materials Science and Engineering
2. Optoelectronics Convergence Research Center
3. Chonnam National University
4. Gwangju 61186
5. Republic of Korea
6. Department of Physics
7. Incheon National University
8. Incheon 22012
9. Photo-electronic Hybrids Research Center
10. Korea Institute of Science and Technology (KIST)
11. Seoul 02792
12. Division of Nano and Information Technology
13. Hanbat National University
14. Daejeon 34158