In-operando investigation of Purcell effect on efficiency roll-off in top-emitting phosphorescent organic light emitting diodes

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals Pub Date : 2025-02-14 DOI:10.1016/j.synthmet.2025.117848

Mina Riahi, Kou Yoshida, Liam G. King, Ifor D.W. Samuel

引用次数: 0

Abstract

Efficiency roll-off is a major issue for applications of organic light emitting diodes (OLEDs) that require high brightness. The underlying processes leading to efficiency roll-off in phosphorescent OLEDs include triplet-polaron (TPA) and triplet-triplet annihilation (TTA). Hence, decreasing the triplet exciton lifetime by enhancing radiative decay rates can be an effective method to manage efficiency roll-off in phosphorescent OLEDs. Here we use in-operando measurement to study the Purcell effect and engineer efficiency roll-off. By changing the cavity parameters and measuring electroluminescence (EL) and photoluminescence (PL) on operating devices, we find that devices with higher Purcell factor have a smaller efficiency roll-off, suggesting a route to improve the performance of OLEDs in high brightness applications.

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珀塞尔效应对顶发磷光有机发光二极管效率滚降的在职研究

对于要求高亮度的有机发光二极管（oled）应用来说，效率滚降是一个主要问题。导致磷光oled效率滚降的基本过程包括三重极化子（TPA）和三重极化子湮灭（TTA）。因此，通过提高辐射衰减率来降低三重态激子寿命可能是控制磷光oled效率滚降的有效方法。在这里，我们使用运行中的测量来研究Purcell效应和工程效率滚降。通过改变空腔参数并测量操作器件的电致发光（EL）和光致发光（PL），我们发现Purcell因子较高的器件具有较小的效率滚降，为提高oled在高亮度应用中的性能提供了一条途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Synthetic Metals 工程技术-材料科学：综合

CiteScore

8.30

自引率

4.50%

发文量

189

审稿时长

33 days

期刊介绍： This journal is an international medium for the rapid publication of original research papers, short communications and subject reviews dealing with research on and applications of electronic polymers and electronic molecular materials including novel carbon architectures. These functional materials have the properties of metals, semiconductors or magnets and are distinguishable from elemental and alloy/binary metals, semiconductors and magnets.