[1] Seoul Natl Univ, Inter Univ Semicond Res Ctr ISRC, Dept Elect Engn & Comp Sci, Seoul 151744, South Korea
[2] Inha Univ, Dept Adv Fiber Engn, Optoelect Hybrids Res Ctr, Inchon 402751, South Korea
[3] Gyeongsang Natl Univ, Sch Mat Sci & Engn, Jinju 660701, South Korea
[4] Gyeongsang Natl Univ, ERI, Jinju 660701, South Korea
[5] Gyeongsang Natl Univ, Dept Chem, Jinju 660701, South Korea