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Benzene-cored AIEgens for deep-blue OLEDs: high performance without hole-transporting layers and unexpected excellent host for orange emission as a side-effect

机译:适用于深蓝色OLED的以苯为核心的AIEgens:高性能无空穴传输层并具有出乎意料的出色宿主可产生橙色发光(副作用)

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摘要

Great efforts have been devoted to explore efficient fluorescent materials, especially deep-blue luminogens, for organic light emitting diodes (OLEDs). In this paper, according to the design idea of creating luminogens with the characteristic of aggregation induced emission (AIE), four new benzene-cored luminogens with very simple structure have been intelligently designed, in which, without an additional hole-transporting layer (such as NPB), >3TPA-CN exhibited deep-blue emission and high performance in a simple nondoped LED device with a current efficiency (CE) of 5.21 cd A–1, external quantum efficiency (EQE) of 3.89%, and CIE coordinates of (0.15, 0.14). Excitingly, as a wonderful side-effect, >3TPA-CN can serve as an excellent host for orange emissive phosphorescent OLEDs (PhOLEDs), with a maximum current and power efficiency of 57.4 cd A–1 and 52.0 lm W–1, respectively, and a corresponding maximum EQE of 18.2%, higher than that of CBP (15.7%), one popular host for orange PhOLEDs, under the same conditions, thus broadening the utilization of AIEgens as host in PhOLEDs.
机译:为了开发用于有机发光二极管(OLED)的高效荧光材料,尤其是深蓝色发光剂,已经做出了巨大的努力。本文根据创建具有聚集诱导发射(AIE)特征的发光剂的设计思路,智能地设计了四种结构非常简单的新型苯核发光剂,其中没有额外的空穴传输层(例如(NPB),> 3TPA-CN 在简单的非掺杂LED器件中表现出深蓝光发射,并具有高性能,电流效率(CE)为5.21 cd A –1 ,外部量子效率(EQE)为3.89%,CIE坐标为(0.15,0.14)。令人兴奋的是,> 3TPA-CN 可以作为橙色发光磷光OLED(PhOLED)的出色主机,其最大电流和功率效率为57.4 cd A –1 和52.0 lm W –1 ,相应的最大EQE为18.2%,高于相同条件下橙色PhOLED的一种受欢迎的主机CBP(15.7%)。 ,从而扩大了AIEgens作为PhOLEDs宿主的利用率。

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