Chemical Strategies for Modifying Carbonyl/Nitrogen-Based MR-TADF Materials toward Narrowband Emission

IF 7.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Zhipeng Guo, Xiaopeng Zhang, Aowei Zhou, Valentina Utochnikova, Yanan Zhu, Hong Meng
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Abstract

The past decade has witnessed remarkable progress in multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters based on nitrogen/carbonyl (N/C═O) frameworks, the quinolino[3,2,1-de]acridine-5,9-dione (QAO) derivatives, with a focus on achieving narrowband emission for high-performance OLED applications such as ultra-HD displays. This review categorizes and analyzes structural modifications across four key molecular architectures—pristine QAOs, phenyl-substituted QAOs, cyclized QAOs, and polynuclear QAOs—revealing their distinct impacts on full width at half maximum (FWHM), reorganization energy (λ), and excited-state dynamics. Notably, structural strategies such as R1 substitution, R4-R5 cyclization, and steric shielding with bulky groups like tert-butyl lead to enh anced molecular rigidity, suppressed vibrational relaxation, and record-narrow emissions (FWHM ≤ 13 nm). Furthermore, donor-acceptor tuning across the series enables precise the highest occupied molecular orbital (HOMO) – the lowest unoccupied molecular orbital (LUMO) separation, balancing short-range charge transfer with emission color control. Emission statistics, fluorescence lifetime analysis, and device performance metrics are presented, consolidating structure-property relationships across >100 reported derivatives. This review provides design principles grounded in both theoretical insight and empirical evidence, offering a roadmap for the development of next-generation MR-TADF materials with high color purity, stability, and efficiency. These findings highlight the N/C = O MR core as a versatile and promising scaffold for advanced display technologies.

Abstract Image

羰基/氮基MR-TADF材料窄带发射改性的化学策略
在过去的十年里,基于氮/羰基(N/C = O)框架、喹啉[3,2,1-de]吖啶-5,9-二酮(QAO)衍生物的多共振热激活延迟荧光(MR-TADF)发射器取得了显著进展,重点是实现高性能OLED应用(如超高清显示器)的窄带发射。本文对四种关键分子结构的结构修饰进行了分类和分析,揭示了它们对半最大值全宽度(FWHM)、重组能(λ)和激发态动力学的不同影响。值得注意的是,R1取代、R4-R5环化和叔丁基等大基团的空间屏蔽等结构策略可以增强分子刚度,抑制振动弛豫,并实现创纪录的窄发射(FWHM≤13 nm)。此外,整个系列的供体-受体调谐实现了最高已占据分子轨道(HOMO) -最低未占据分子轨道(LUMO)的精确分离,平衡了短程电荷转移和发射颜色控制。提出了发射统计,荧光寿命分析和器件性能指标,巩固了100个报告衍生物的结构-性质关系。本综述提供了基于理论见解和经验证据的设计原则,为开发具有高颜色纯度,稳定性和效率的下一代MR-TADF材料提供了路线图。这些发现突出了N/C = O MR核心作为先进显示技术的多功能和有前途的支架。
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
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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