68.2: Achieving High Color Gamut with Microcavity on White OLED

Abstract We have demonstrated bottom‐emission white OLED devices, which have RGBW sub‐pixel and high color gamut over 100% NTSC ratio with White‐to‐Green microcavity technique. Large‐Sized AMOLED TV has to show very high quality display images to overcome LCD TV. However, the R, G and B colors filtered by LCD color‐filters are not saturated enough. Especially, green emission peak is very broad because blue emission peak is not removed perfectly by green color‐filter. Therefore, we fabricate white OLED having saturated green color by adapting microcavity technique. The results of green pixels are (0.211, 0.723) in color coordinates, and the efficiency of green is 15.4 cd/A, which was (0.217, 0.600) and 7.5 cd/A. And the color gamut with microcavity reaches more than 100% NTSC.