Dr. Sangyeob Lee is assistant professor in the Department of Materials Science and Engineering at Hanbat National University. He received his Ph.D. from University of California, Irvine in 2009 in the areas of nano-materials and devices. He was a post-doc in University of California, San Diego and research staff member at Samsung Display and Samsung Advanced Institute of Technology. He was a head of OLED development group of China Star Optoelectronic Technology. He is currently working on optoelectronic materials and devices.