Highly efficient orange-red and white organic light-emitting diodes (OLEDs) based exciplex host with different donor/acceptor ratios and doping concentrations are fabricated for efficient triplet excitons harvest. As a result, the maximum efficiency is achieved at 5:5 ratios exciplex host in orange-red OLEDs with current efficiency, power efficiency and external quantum efficiency (EQE) of 37.0 cd/A, 37.3 lm/W and 18.3%, respectively. Furthermore, the white OLEDs under two different doping concentrations give warm white (0.48, 0.41) and cool white (0.28, 0.37) emission with maximum current efficiencies, power efficiencies and EQEs of 38.3/37.6 cd/A, 41.3/43.7 lm/W and 17.8/16.6%, respectively. We found that the triplet exciton harvest on exciplex host through reverse intersystem crossing process and efficient energy transfer are responsible for the high device efficiency.

制备具有不同施主/受主比例和掺杂浓度的高效橙红和白有机发光二极管（OLED）的激基复合物主体，以实现有效的三重态激子收获。结果，在橙红色OLED中，在5：5比例的激基复合体基质上实现了最大效率，电流效率，功率效率和外部量子效率（EQE）分别为37.0 cd / A，37.3 lm / W和18.3％。此外，在两种不同掺杂浓度下的白色OLED发出暖白色（0.48，0.41）和冷白色（0.28，0.37）的发射，其最大电流效率，功率效率和EQE分别为38.3 / 37.6 cd / A，41.3 / 43.7 lm / W和17.8 / 16.6％。