Routes for Efficiency Enhancement in Fluorescent TADF Exciplex Host OLEDs Gained from an Electro‐Optical Device Model,Advanced Electronic Materials

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Routes for Efficiency Enhancement in Fluorescent TADF Exciplex Host OLEDs Gained from an Electro‐Optical Device Model
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2019-12-19 , DOI: 10.1002/aelm.201900804
Markus Regnat _{1,

2} , Kurt P. Pernstich ₁ , Kwon‐Hyeon Kim ₃ , Jang‐Joo Kim ₃ , Frank Nüesch ₂ , Beat Ruhstaller _{1,

4}

Affiliation

Fluorescence‐based organic light‐emitting diodes (OLEDs) using thermally activated delayed fluorescence (TADF) have increasingly attracted attention in research and industry. One method to implement TADF is based on an emitter layer composed of an exciplex host and a fluorescent dopant. Even though the experimental realization of this concept has demonstrated promising external quantum efficiencies, the full potential of this approach has not yet been assessed. To this end, a comprehensive electro‐optical device model accounting for the full exciton dynamics including triplet harvesting and exciton quenching is presented. The model parameters are fitted to multiple output characteristics of an OLED comprising a TADF exciplex host with a fluorescent emitter, showing an external quantum efficiency of >10%. With the model at hand, an emission zone analysis and a parameter study are performed, and possible routes for further efficiency enhancement are presented.

中文翻译：

从电光器件模型获得的荧光TADF激基复合体OLED效率提高的途径

使用热激活延迟荧光（TADF）的基于荧光的有机发光二极管（OLED）越来越受到研究和行业的关注。一种实现TADF的方法是基于由激基复合材料主体和荧光掺杂剂组成的发射极层。尽管对该概念的实验性实现已经证明了很有希望的外部量子效率，但是这种方法的全部潜力尚未得到评估。为此，提出了一个综合的电光设备模型，该模型考虑了包括三重态收获和激子猝灭在内的整个激子动力学。模型参数适合包含TADF激基复合物主体和荧光发射体的OLED的多个输出特性，显示出的外部量子效率> 10％。有了模型，

更新日期：2020-02-13

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