The effect of PO-T2T acceptor ratio in thermally activated delayed fluorescent donor of DMAC-DPS on exciplex organic light-emitting diodes (OLED) performance is explored herein. As the ratio decrease of PO-T2T acceptor, we found an obvious blue shift of electroluminescence (EL) spectra from 536 nm to 496 nm, while the EL efficiency maintain a high level with maximum current efficiency of 25.7–38.1 cd/A, power efficiency of 24.2–39.5 l m/W and external quantum efficiency (EQE) of 10.4–12.1%, respectively. That means a wide spectral move range of 40 nm without damaging device EQE in exciplex OLED could be realized. The strong interaction between exciplex induced from charge separation is responsible for the blue shift as acceptor ratio reduce.

本文探讨了DMAC-DPS的热活化延迟荧光供体中PO-T2T受体比率对激基复合物有机发光二极管（OLED）性能的影响。随着PO-T2T受体比例的降低，我们发现电致发光（EL）光谱从536 nm到496 nm有明显的蓝移，而EL效率保持较高水平，最大电流效率为25.7–38.1 cd / A，功率效率分别为24.2–39.5 lm / W和外部量子效率（EQE）为10.4–12.1％。这意味着可以实现40 nm的宽光谱移动范围，而不会损坏激基复合物OLED中的器件EQE。电荷分离引起的激基复合物之间的强相互作用是随着受体比例降低蓝移的原因。