具有分子间电荷转移效应的D-σ-A型热激活延迟荧光材料及其电致发光性能

doi:10.11896/cldb.22010216

材料导报

2023, Vol. 37

Issue (14): 22010216-8 https://doi.org/10.11896/cldb.22010216

高分子与聚合物基复合材料

具有分子间电荷转移效应的D-σ-A型热激活延迟荧光材料及其电致发光性能

姚静锋¹, 李昊泽², 吴平¹, 谢凤鸣², 胡英元¹, 赵鑫^1,*

1 苏州科技大学化学与生命科学学院,江苏苏州 215009
2 苏州大学功能纳米与软物质研究院,江苏苏州215123

D-σ-A Type Thermally Activated Delayed Fluorescent Emitters with Intermolecular Charge Transition Effect and Its Electroluminescence Properties

YAO Jingfeng¹, LI Haoze², WU Ping¹, XIE Fengming², HU Yingyuan¹, ZHAO Xin^1,*

1 College of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China
2 Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, Jiangsu, China

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摘要设计合成了三种D-σ-A型热激活延迟荧光(TADF)材料2-(4-(9H-咔唑-9-基)苯氧基)蒽-9,10-二酮(AQOPCZ)、2-(4-(二苯氨基)苯氧基)蒽-9,10-二酮(AQOPDPA)和2-(4-(9,9-二甲基吖啶-10(9H)-基)苯氧基)蒽-9,10-二酮(AQOPDMAC)。这三种材料均采用C-O σ键连接受体和供体,由于σ键阻断供体和受体之间的共轭,较好地实现了三种材料最高未占分子轨道(HOMO)和最低已占分子轨道(LUMO)轨道之间的分离,因此三种材料都获得了很小的三线态与单线态之间的能级差(ΔE_ST＜0.1 eV)和显著的TADF特性。更重要的是,这三种材料与常见的TADF材料不同,它们几乎没有分子内电荷转换(intra-CT)效应,但都具有显著的分子间电荷转换(inter-CT)效应。由于这种强的inter-CT效应,三种TADF材料的荧光光谱在非掺杂薄膜中均显示出长波发射(580～652 nm),并且与溶液中的发射波长(552～574 nm)相比表现出显著的红移。基于这三种TADF材料的发光器件均表现出了较好的电致发光性能,其中,基于AQOPCZ的OLED展现出了最好的器件性能,其最大外量子效率(EQE_max)为6.07%,最大亮度为8 320 cd·m^-2。本工作为长波TADF材料的设计、合成和研究提供了有益的参考。

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关键词: 有机发光二极管热激活延迟荧光分子间电荷转换电致发光

Abstract: Three D-σ-A type thermally activated delayed fluorescent (TADF) materials, AQOPCZ, AQOPDPA and AQOPDMAC, were designed and synthesized using C-O σ bond connecting acceptor and donor. All of the materials possess tiny ΔE_ST (＜0.1 eV), distinct TADF characteristics and limited overlap of the molecular frontier orbitals because of the C-O σ bond and the distorted molecular structure. Compared with common TADF materials, these materials hardly have intramolecular charge transition (intra-CT) effect, but own outstanding intermolecular charge transition (inter-CT) effect. Due to inter-CT effect, three materials show long-wavelength emission (580—652 nm) in non-doped film. The fluorescence spectra of three materials in non-doped film exhibit remarkable red-shift compared with that in the solution (552—574 nm). Among three devices based on these emitters, the device employing AQOPCZ achieved best performance with maximum external quantum efficiencies of 6.07% and maximum luminance of 8 320 cd·m^-2. This work enriched the kind of D-σ-A type TADF materials and the preparation methods of long-wavelength TADF materials.

Key words: organic light-emitting diodes thermally activated delayed fluorescence intermolecular charge transition electroluminescence

出版日期: 2023-07-25 发布日期: 2023-07-24

ZTFLH:

O621.22

基金资助: 国家自然科学基金(21905048)

通讯作者: *赵鑫,1988年毕业于河南师范大学化学系化学专业,1996年毕业于华中科技大学化学化工学院应用化学专业,获工学硕士学位。现为苏州科技大学教授、硕士研究生导师。主要从事有机光电功能材料的设计、合成及应用研究。在国内外重要学术期刊发表研究论文80余篇。获授权发明专利2项。zhaoxinsz@usts.edu.cn

作者简介: 姚静锋,2019年6月于苏州科技大学获得学士学位。现为苏州科技大学硕士研究生,主要从事有机光电材料的合成与性能研究。

引用本文:

姚静锋, 李昊泽, 吴平, 谢凤鸣, 胡英元, 赵鑫. 具有分子间电荷转移效应的D-σ-A型热激活延迟荧光材料及其电致发光性能[J]. 材料导报, 2023, 37(14): 22010216-8.
YAO Jingfeng, LI Haoze, WU Ping, XIE Fengming, HU Yingyuan, ZHAO Xin. D-σ-A Type Thermally Activated Delayed Fluorescent Emitters with Intermolecular Charge Transition Effect and Its Electroluminescence Properties. Materials Reports, 2023, 37(14): 22010216-8.

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http://www.mater-rep.com/CN/10.11896/cldb.22010216 或 http://www.mater-rep.com/CN/Y2023/V37/I14/22010216

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