White phosphorescent organic light-emitting devices with dual triple-doped emissive layers

We demonstrate high efficiency white organic light-emitting devices with two adjacent emissive layers each doped with three phosphorescent emitters (blue, green, and red). Efficient charge and exciton confinement is realized by employing charge transport layers with high triplet energy, leading to a maximum external quantum efficiency of (19 +/- 1)%. Using the p-i-n device structure, we have achieved a peak power efficiency of (40 +/- 2) lm/W and (36 +/- 2) lm/W at 100 cd/m(2), a color rendering index of 79, and Commission Internationale de L'Eclairage coordinates of (0.37, 0.40) for the white light emission.