1. Center for Opto-Electronic Materials and Devices
2. Korea Institute of Science and Technology
3. Seoul 02792
4. Republic of Korea
5. Display and Nanosystem Laboratory
6. Division of Nano & Information Technology
7. Clean Energy Research Center
8. Department of Physics
9. College of Engineering
10. Korea University
11. Seoul 02841
12. Bradley Department of Electrical and Computer Engineering
13. Virginia Tech
14. Blacksburg VA 24061
15. USA