Efficient triplet harvesting in fluorescence-TADF hybrid warm-white organic light-emitting diodes with a fully non-doped device configuration
Efficient triplet harvesting in fluorescence-TADF hybrid warm-white organic light-emitting diodes with a fully non-doped device configuration
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具有完全非掺杂器件配置的荧光-TADF混合暖白光有机发光二极管的高效三重态收获
DOI：
10.1039/c8tc01210e
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发表时间：
2018
影响因子：
6.4
通讯作者：
Chi Zhenguo
中科院分区：
文献类型：
--
作者：
Zhao Juan;Yang Zhan;Chen Xiaojie;Xie Zongliang;Liu Tiantian;Chi Zhihe;Yang Zhiyong;Zhang Yi;Aldred Matthew P.;Chi Zhenguo
由传统荧光和热激活延迟荧光(TADF)组成的混合荧光型有机发光二极管(WOLED)可以在不使用昂贵的金属有机荧光粉的情况下实现高效率。然而，这些类型的OLED大多需要复杂的制造技术，特别是主-客体掺杂系统和多层中间层。本文提出了一种高效的混合荧光WOLED设计方案，将传统的蓝色荧光发射体与黄色TADF发射体简单地堆叠在一起，而不需要任何中间层。由于所选择的蓝色发射体的高三重态激发态，其固有的非辐射三重态激子可以通过外能转移到相邻的黄色TADF发射体而有效地用于发光。在此基础上，采用具有聚集诱导发射特性的蓝色荧光发射体，在400cd m−2的高亮度下，获得了最大的外量子效率20.8%。这一策略为基于全非掺杂器件结构的高效荧光-TADF混合WOLED的制备提供了一种通用的方法。
Warm-white organic light-emitting diodes (WOLEDs) fabricated with hybrid fluorescence-based emitters, consisting of traditional fluorescence and thermally activated delayed fluorescence (TADF) emitters can achieve high efficiency without the use of expensive organometallic phosphors. However, most of these types of OLEDs require complicated fabrication techniques, especially host–guest doping systems and multiple interlayers. Herein, an efficient design strategy for hybrid fluorescence WOLEDs is presented, in which a traditional blue fluorescence emitter is simply stacked together with a yellow TADF emitter without any interlayers. Due to the high triplet excited state of the chosen blue emitter, its intrinsically non-radiative triplet excitons can be efficiently utilized for light emission, by exoergic transfer to the adjacent yellow TADF emitter. Following this idea, a maximum external quantum efficiency of 20.8% at a high luminance of 400 cd m−2 is achieved for a fully non-doped WOLED when using a blue fluorescent emitter with the aggregation-induced emission property. This strategy provides a universal approach for the fabrication of highly-efficient fluorescence–TADF hybrid WOLEDs based on the fully non-doped device configuration.