1. Department of Nano Systems Engineering, Center for Nano Manufacturing, Inje University, Gimhae 621-749, Republic of Korea
2. Ink Technology Center, Ink Tec. Co. Ltd., Pyeongtaek 451-821, Republic of Korea
3. School of Nano Engineering, Inje University, Gimhae 621-749, Republic of Korea
4. Epi-manufacturing Technology, Samsung LED Co., Ltd., Suwon 443-373, Republic of Korea
5. Department of Physics, Yeungnam University, Gyeongsan 712-749, Republic of Korea