Duksan Hi-Metal (part of the DS Group) is a material maker based in Korea, involved in two segments - semiconductor and OLED materials. Duksan produces OLED materials and is a supplier of Samsung Display.
Back in 2008, Duksan bought the Ludis OLED business unit of Sinsung ENG and this is the basis of their AMOLED business unit. The company currently produces many OLED stack materials (but not emitters).
In September 2012 Duksan was contracted by UDC to produce OLED host materials in Korea.