Highly efficient orange and white organic light-emitting devices based on exciplex-assisted multilayer thermally activated delayed fluorescence sensitization strategy

IF 3.6 3区 物理与天体物理 Q2 OPTICS
Qianqian Gu , Xiaolin Hu , Mengmeng Zhang , Yafei Xie , Liping Yang , Jintao Wang , Ren Sheng , Ping Chen
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引用次数: 0

Abstract

Achieving highly efficient organic light-emitting diodes (OLEDs) with low efficiency roll-off at high current densities still faces severe challenges. Herein, by employing a new sensitization strategy that cleverly arranges thermally activated delayed fluorescence (TADF) sensitized layers and phosphorescent layers alternately, high-performance orange and white OLEDs are fabricated based on a novel exciplex host. The resulting orange phosphorescent OLED achieves a maximum current efficiency (CE) of 90.6 cd/A, and still maintains at 87.3 cd/A at a luminance of 1000 cd/m2. Meanwhile, by further changing the thickness of blue TADF sensitizer, the hybrid white OLED exhibits extremely stable spectrum with a total CIE variation of only (0.003, 0.001) from 1105 cd/m2 to 9988 cd/m2. Notably, the CE retains 65.6 cd/A at 1000 cd/m2, corresponding to only a 2.5 % decrease in CE. These outstanding performances are attributed to the enhanced Förster energy transfer between sensitizer and emitter, thereby effectively alleviating exciton aggregation and annihilation. These results demonstrate that our strategy shows great potential in achieving high-efficiency OLEDs with low efficiency roll-off.
基于显子辅助多层热激活延迟荧光敏化策略的高效橙色和白色有机发光器件
在高电流密度下实现低效率滚降的高效有机发光二极管(oled)仍面临严峻挑战。本文采用一种新的敏化策略,巧妙地将热激活延迟荧光(TADF)敏化层和磷光层交替排列,制备了基于新型激复体主体的高性能橙色和白色oled。所得到的橙色磷光OLED实现了90.6 cd/ a的最大电流效率(CE),并且在1000 cd/m2的亮度下仍然保持在87.3 cd/ a。同时,通过进一步改变蓝色TADF敏化剂的厚度,混合白色OLED表现出非常稳定的光谱,在1105 cd/m2到9988 cd/m2之间的总CIE变化仅为(0.003,0.001)。值得注意的是,在1000 cd/m2时,CE保持65.6 cd/A,相当于CE仅下降2.5%。这些优异的性能归功于增敏剂和发射极之间Förster能量传递的增强,从而有效地减轻了激子的聚集和湮灭。这些结果表明,我们的策略在实现低效率滚转的高效率oled方面显示出巨大的潜力。
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
Journal of Luminescence
Journal of Luminescence 物理-光学
CiteScore
6.70
自引率
13.90%
发文量
850
审稿时长
3.8 months
期刊介绍: The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.
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