Multifunctional thermally activated delayed fluorescence emitter for both doped and non-doped organic light emitting diodes

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

Organic Electronics Pub Date : 2024-11-05 DOI:10.1016/j.orgel.2024.107157

Nisha Yadav, Pachaiyappan Rajamalli

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Abstract

Developing efficient smart materials that display mechanochromic luminescence (MCL) and thermally activated delayed fluorescence (TADF) remains a formidable challenge. Herein, we designed and synthesized a multifunctional emitter, 2BPy-mTC, where benzoyl pyridyl (2BPy) acts as an acceptor and 3,6-di-tert-butyl-9H-carbazole (TC) acts as a donor. 2BPy-mTC exhibits blue emission with λ_max of 456 nm in pristine form and emission shifted to green with λ_max of 495 nm upon grinding. Interestingly, when fumed with CH₂Cl₂, the emission reverts to deep blue at λ_max of 440 nm. 2BPy-mTC possesses a ΔE_ST of 0.20 eV in neat film and 0.11 eV in doped film (5 wt% 2BPy-mTC: mCBP) and exhibits a PLQY of 42 % in neat film and 59 % in doped film. The transient photoluminescence (PL) decay curves show a delayed lifetime of 110.3 μs for the neat film and 192.9 μs for the doped film and confirm the TADF property in both doped and non-doped film. It shows an EQE_max of 16.3 % in doped device with an emission maximum of 484 nm. Conversely, it retains the EQE_max of 13.8 % in non-doped device with a slight red shift in the emission maximum (496 nm). This discovery opens a new avenue for designing multifunctional emitters with improved EL performance.

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用于掺杂和非掺杂有机发光二极管的多功能热激活延迟荧光发射器

开发能显示机械变色发光（MCL）和热激活延迟荧光（TADF）的高效智能材料仍然是一项艰巨的挑战。在这里，我们设计并合成了一种多功能发射体 2BPy-mTC，其中苯甲酰基吡啶（2BPy）作为受体，3,6-二叔丁基-9H-咔唑（TC）作为供体。2BPy-mTC 在原始状态下发出蓝色光，λmax 为 456 nm，在研磨后则转变为绿色光，λmax 为 495 nm。有趣的是，当用 CH2Cl2 发泡时，发射恢复为深蓝色，λmax 为 440 纳米。2BPy-mTC 在纯薄膜中的ΔEST 为 0.20 eV，在掺杂薄膜（2BPy-mTC：mCBP 的比例为 5 wt%）中的ΔEST 为 0.11 eV，在纯薄膜中的 PLQY 为 42%，在掺杂薄膜中的 PLQY 为 59%。瞬态光致发光（PL）衰减曲线显示，纯薄膜的延迟寿命为 110.3 μs，掺杂薄膜的延迟寿命为 192.9 μs，这证实了掺杂和非掺杂薄膜的 TADF 特性。在掺杂器件中，EQEmax 为 16.3%，最大发射波长为 484 nm。相反，在非掺杂器件中，EQEmax 为 13.8%，但发射最大值（496 纳米）略有红移。这一发现为设计具有更好电致发光性能的多功能发射器开辟了一条新途径。

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

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.