White organic light-emitting devices with a phosphorescent multiple emissive layer

Abstract

A phosphorescent multiple emissive layer, in which a blue emissive layer is sandwiched between red and green ones, is employed in a white organic light-emitting device (OLED). This OLED has a maximum luminance of 48000cd∕m2 at 17V, a maximum power efficiency of 9.9lm∕W at 4V, and a color rendering index of 82. In addition, the emission color of this device is fairly stable at high luminances: its Commission Internationale de l′Eclairage coordinate slightly changes from (0.431, 0.436) to (0.400, 0.430) when the luminance ranges from 2000to40000cd∕m2.