State Key Laboratory of Luminescence and Applications, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
Opt Lett. 2012 Jun 1;37(11):2019-21. doi: 10.1364/OL.37.002019.
Studies on phosphorescent organic light emitting devices (PhOLEDs) with phosphorescent emitter, fac-tris (2-phenylpyridine) iridium (Ir(ppy)(3)), show that the lifetime of triplet exciton is modified by surface plasmon coupling of Au nanoparticles (NPs). Interactions between the triplet exciton and gold (Au) nanoparticles (NPs) lead to a decrease in the exciton lifetime and result in the spontaneous emission decay rate of triplet exciton faster as the distance between the phosphorescent material and the Au NPs becomes smaller. This interaction reduces the efficiency roll-off of Au NPs containing device. These results provide new guides for device design to improve efficiency performance.
研究表明，通过金纳米粒子（Au NPs）的表面等离激元耦合，可以修饰磷光有机发光器件（PhOLEDs）中的磷光体，即三价激子的寿命。三价激子与金纳米粒子（Au NPs）之间的相互作用会导致激子寿命缩短，从而使磷光材料与 Au NPs 之间的距离越小，三价激子的自发发射衰减速率越快。这种相互作用降低了含有 Au NPs 的器件的效率滚降。这些结果为改善器件效率性能的器件设计提供了新的指导。
