68.2: Achieving High Color Gamut with Microcavity on White OLED

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.