[1] Inje Univ, Ctr Nano Mfg, Dept Nano Syst Engn, Gimhae 621749, Gyungnam, South Korea
[2] Clemson Univ, Holcombe Dept Elect & Comp Engn, Ctr Opt Mat Sci & Engn Technol, Clemson, SC 29634 USA
[3] Inje Univ, Dept Nano Engn, Gimhae 621749, Gyungnam, South Korea
[4] Samsung Elect Co Ltd, LED R&D Team, Yongin 446711, South Korea
[5] Chonbuk Natl Univ, Div Adv Mat Engn, RCAMD, Jeonju 561756, Chonbuk, South Korea
[6] Yeungnam Univ, Dept Phys, Gyongsan 712749, Gyeongsangbuk D, South Korea