High-performance non-doped deep-blue/white OLEDs via HLCT-type oxazole emitter with negligible efficiency roll-off

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-09-25 DOI:10.1063/5.0288801

Xin Ge, Qiao Luo, Huixia Xu, Hua Wang, Ding Zheng, Junsheng Yu

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引用次数: 0

Abstract

Stable deep-blue emitters with high-efficiency and low-efficiency roll-off are crucial for the commercialization of deep-blue organic light-emitting diodes (OLEDs). Hybridized local and charge-transfer (HLCT) emitters can achieve high external quantum efficiency (EQE) and extremely low efficiency roll-off through efficient high-lying reverse intersystem crossing. In this work, we developed a simple, efficient deep-blue HLCT emitter, PBOAn2N, which exhibited an emission peak at 446 nm with CIE coordinates of (0.131, 0.086). The related OLED device achieved the maximum EQE of 9.7%, demonstrating an exceptionally low efficiency roll-off of merely 1.0% at 1000 cd m−2. Furthermore, when employed as a host material for an orange phosphorescent emitter, PBOAn2N demonstrated exceptional performance with a maximum EQE of 25.7% and an ultralow efficiency roll-off of merely 0.4% at 1000 cd m−2. By integrating a PBOAn2N-based blue-emitting layer into the orange phosphorescent system, we fabricated a two-color hybrid WOLED with minimal roll-off (2.3% at 1000 cd m−2), achieving near-ideal CIE coordinates approaching (0.333, 0.333). Notably, the optimized device attained a record-high color rendering index of 68.4, representing one of the best performances reported for two-color hybrid WOLEDs, thereby showcasing the significant potential of PBOAn2N-based systems for high-quality white light emission applications.

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通过hlct型恶唑发射极的高性能非掺杂深蓝/白色oled，其效率滚降可以忽略不计

具有高效率和低效率滚转的稳定的深蓝发光体是深蓝有机发光二极管（oled）商业化的关键。杂化局域和电荷转移（HLCT）发射体可以通过高效的高位反向系统间交叉实现高外量子效率（EQE）和极低效率滚转。在这项工作中，我们开发了一种简单，高效的深蓝HLCT发射器PBOAn2N，它在446 nm处显示出发光峰，CIE坐标为（0.131,0.086）。相关的OLED器件实现了9.7%的最大EQE，在1000 cd m−2时显示出异常低的效率滚降，仅为1.0%。此外，当作为橙色磷光发射器的主体材料时，PBOAn2N表现出了卓越的性能，在1000 cd m−2下，EQE最大达到25.7%，超低效率滚降仅为0.4%。通过将基于pboan2n的蓝色发射层集成到橙色磷光系统中，我们制造了具有最小滚降（1000 cd m−2时2.3%）的双色混合WOLED，实现了接近理想的CIE坐标（0.333,0.333）。值得注意的是，优化后的器件达到了创纪录的68.4的显色指数，代表了双色混合WOLEDs的最佳性能之一，从而显示了基于pboan2n的系统在高质量白光发射应用中的巨大潜力。

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

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.