Although stable deep-red organic light-emitting devices (OLEDs) exhibit potential applications as unique illumination light sources for plant growth and in health monitoring systems, their electron-to-photon conversion efficiency, represented by the external quantum efficiency (EQE), is significantly lower than that of the other primary colors. Thus, to overcome this limitation, n-type exciplex host partners based on quinoline-modified phenanthroline derivatives, X-BPhen, were designed and synthesized in this study. These X-BPhen derivatives formed exciplexes on combination with a p-type host material, NPD, behaving as host materials in deep-red phosphorescent OLEDs. The corresponding devices exhibited a maximum EQE of 17.6%, with CIE coordinates of (0.71, 0.29), and an LT80 of 410 h at a constant current density of 25 mA/cm2; this is among the best performances reported for stable deep-red OLEDs.
虽然稳定的深红色有机发光二极管(OLED)作为独特的照明光源在植物生长和健康监测系统中具有潜在的应用前景,但其电子到光子的转换效率(以外部量子效率(EQE)表示)明显低于其他原色。因此,为了克服这一局限性,本研究设计并合成了基于
喹啉修饰
菲罗啉衍
生物的n型激子主材料X-BPhen。这些X-BPhen衍
生物与p型主材料NPD结合形成激子,在深红色
磷光OLED中充当主材料。相应的器件在恒定电流密度为25 mA/cm2时,表现出17.6%的最大EQE、CIE坐标(0.71, 0.29)和410 h的LT80;这是已报道的稳定深红色OLED的最佳性能之一。