周围环境对基于热激子的 TADF 应用有机发射器的影响

IF 3 4区 化学 Q3 CHEMISTRY, PHYSICAL
Jesni M. Jacob, Dr. Mahesh Kumar Ravva
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引用次数: 0

摘要

了解固态环境中的热激活延迟荧光(TADF)对于实际应用至关重要。然而,关于介质如何影响热电子发射器的热激活延迟荧光特性的研究却非常有限。在我们的研究中,我们计算并比较了气相、溶剂相和固相中 TADF 发射器的反向系统间交叉、辐射和非辐射衰减率。所设计的发射器具有供体-受体-供体(D-A-D)结构,供体包括三苯胺(TPA)和二苯胺噻吩(ThPA),受体包括苯并噻二唑(BT)、吡啶噻二唑(PT)和噻二唑基苯并吡啶(NPT)。我们分别采用可极化连续体模型(PCM)和量子力学/分子力学(QM/MM)方法对溶剂相和固相进行建模。利用密度泛函理论(DFT)和时变 DFT,我们分析了 TADF 发射器的几何、电子和激发态特性在这些相中的变化情况。我们的研究结果表明,固态环境对发射器的几何形状和 TADF 特性有重大影响。我们的研究表明,在存在固体介质的情况下,非辐射衰变速率往往较慢。另一方面,辐射发射率受周围介质特性的影响较小。总之,我们的研究将发射体化学结构和周围环境对激发态特性和光化学特性的影响联系起来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Impact of Surrounding Environment on Hot-Exciton Based Organic Emitters for TADF Applications

Impact of Surrounding Environment on Hot-Exciton Based Organic Emitters for TADF Applications

Understanding thermally activated delayed fluorescence (TADF) in solid-state environments is crucial for practical applications. However, limited research focuses on how the medium affects TADF properties of hot-exciton-based emitters. In our study, we calculated and compared reverse intersystem crossing, radiative, and non-radiative decay rates of TADF emitters in gas, solvent, and solid phases. The designed emitters have a donor-acceptor-donor (D-A-D) structure, with donors such as triphenylamine (TPA) and diphenylamine thiophene (ThPA), combined with acceptors such as benzothiadiazole (BT), pyridine thiadiazole (PT) and thiadiazolobenzopyridine (NPT). We model the solvent and solid phases with the polarizable continuum model (PCM) and quantum mechanical/molecular mechanics (QM/MM) methods, respectively. Using density functional theory (DFT) and time-dependent DFT, we analyze how TADF emitters′ geometrical, electronic, and excited-state properties vary in these phases. Our results show that the solid-state environment significantly influences the geometry and TADF properties of emitters. In the presence of solid medium, our study indicates that non-radiative decay rates tend to be slower. On the other hand, radiative emission rates were found to be less influenced by the properties of the surrounding medium. Overall, our study connects emitter chemical structure and the surrounding environment‘s impact on excited-state characteristics and photochemical properties.

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来源期刊
ChemPhotoChem
ChemPhotoChem Chemistry-Physical and Theoretical Chemistry
CiteScore
5.80
自引率
5.40%
发文量
165
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