Spirobifluorene-appended multi-resonance thermally activated delayed fluorescence emitter for efficient narrowband blue OLEDs with suppressed ACQ effect

IF 2.7 4区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Organic Electronics Pub Date : 2024-06-11 DOI:10.1016/j.orgel.2024.107084

Jia-Chen Li , Zhang-Li Cheng , Jie Li , Hui Wang , Feng Huang , Ying-Chun Cheng , Hao Wu , Xin Xiong , Jia Yu , Hua-Yue Wu , Jie-Yu Zhou , Kai Wang , Xiao-Hong Zhang , Jun Ye

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Abstract

Multi-resonance (MR) thermally activated delayed fluorescence (TADF) materials with planar rigidity show great potential as emitters in organic light-emitting diodes (OLEDs) due to their high photoluminescence quantum yields and narrowband emission. However, their strong intermolecular interaction trends usually result in redshifted and broadened emission spectra as well as low device efficiencies due to the aggregation-caused quenching (ACQ) effect. In this paper, a bulky spirobifluorene unit was appended onto an asymmetric carbazole/diphenylamine-embedded MR skeleton to relieve such trends, thus affording a new MR-TADF blue emitter, BNSF-1. Introducing spirobifluorene significantly relieves the intermolecular interaction trends of MR backbones without affecting their original photophysical properties. The corresponding sensitizer-free OLED devices based on BNSF-1 exhibit narrowband sky-blue electroluminescence peaking at 475 nm with a full width at half-maximum of 25 nm, as well as a maximum external quantum efficiency of 25.9 %. More importantly, BNSF-1 exhibited negligible spectral broadening and ACQ trends as the doping ratio increased. Our work provides a feasible method for constructing doping concentration-insensitive MR-TADF emitters.

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用于抑制 ACQ 效应的高效窄带蓝色 OLED 的螺二芴添加型多共振热激活延迟荧光发射器

具有平面刚性的多共振（MR）热激活延迟荧光（TADF）材料由于具有高光致发光量子产率和窄带发射特性，在有机发光二极管（OLED）中作为发光体显示出巨大的潜力。然而，由于聚集淬灭（ACQ）效应，它们强烈的分子间相互作用趋势通常会导致发射光谱的红移和拓宽，以及较低的器件效率。本文在不对称咔唑/二苯胺嵌入式 MR 骨架上附加了一个大螺二芴单元，以缓解这种趋势，从而获得了一种新型 MR-TADF 蓝色发射体 BNSF-1。螺二芴的引入大大缓解了 MR 骨架的分子间相互作用趋势，而不会影响其原有的光物理特性。基于 BNSF-1 的相应无敏化剂 OLED 器件在 475 nm 处显示出峰值为 25 nm 的窄带天蓝色电致发光，最大外部量子效率为 25.9%。更重要的是，随着掺杂率的增加，BNSF-1 的光谱展宽和 ACQ 趋势均可忽略不计。我们的工作为构建对掺杂浓度不敏感的 MR-TADF 发射器提供了一种可行的方法。

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

Organic Electronics 工程技术-材料科学：综合

CiteScore

6.60

自引率

6.20%

发文量

238

审稿时长

44 days

期刊介绍： Organic Electronics is a journal whose primary interdisciplinary focus is on materials and phenomena related to organic devices such as light emitting diodes, thin film transistors, photovoltaic cells, sensors, memories, etc. Papers suitable for publication in this journal cover such topics as photoconductive and electronic properties of organic materials, thin film structures and characterization in the context of organic devices, charge and exciton transport, organic electronic and optoelectronic devices.