Multiscale Simulations Reveal the Mechanism of Host-Induced Room-Temperature Phosphorescence in Multiple Resonance Emitters

IF 7.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Zhenyi Lin, Yuehui Lin, Yu Shen, Xiaokang Yao, Kang Shen, Zhongfu An, Huili Ma
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Abstract

Multiple resonance (MR) emitters typically exhibit narrowband thermally activated delayed fluorescence (TADF), yet their recently discovered host-assisted room-temperature phosphorescence (RTP) remains unclear. Herein, the origin of this luminescence switching is elucidated through a combined theoretical and experimental study of a prototypical MR emitter, quinolino[3,2,1-de]acridine-5,9-dione (QAO). While QAO displays TADF in 9,9′-(1,3-phenyl)di-9H-carbazole (mCP) film but switches to RTP in benzophenone (BP) crystal. Multiscale simulations reveal that BP-induced conformational distortion triggers a conversion from S1(π, π*) to S1(n, π*). This change i) introduces a dipole-forbidden transition, leading to >300-fold reduction in radiative decay rate; ii) and largely enhances the spin–orbit coupling of S1 → T1, accelerating the intersystem crossing (ISC) rate by five orders of magnitude, with the aid of enhanced vibronic coupling. Additionally, the singlet-triplet energy gap shows a tiny change with values of ≈0.2 eV, supporting the reverse ISC for triplet exciton harvesting. As a result, the bright TADF of QAO in mCP film is converted to RTP in BP crystal, with theoretical predictions showing excellent agreement with experimental emission spectra and RTP lifetimes. These findings provide fundamental insights into the molecular design of high-performance MR-based RTP materials, paving the way for next-generation organic optoelectronic applications.

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多尺度模拟揭示了宿主在多共振发射体中诱导室温磷光的机制
多共振(MR)发射体通常表现为窄带热激活延迟荧光(TADF),但它们最近发现的宿主辅助室温磷光(RTP)仍不清楚。本文通过对一种典型MR发射体——喹啉[3,2,1-de]吖啶-5,9-二酮(QAO)的理论和实验相结合的研究,阐明了这种发光开关的起源。QAO在9,9′-(1,3-苯基)二- 9h -咔唑(mCP)薄膜中显示TADF,在二苯甲酮(BP)晶体中显示RTP。多尺度模拟表明,bp诱导的构象畸变触发了从S1(π, π*)到S1(n, π*)的转换。这种变化i)引入了偶极子禁止跃迁,导致辐射衰减率降低300倍;ii)并且极大地增强了S1→T1的自旋-轨道耦合,借助增强的振动耦合,使系统间交叉(ISC)速率加快了5个数量级。此外,单重态-三重态能隙的变化很小,约为0.2 eV,支持三重态激子收获的反向ISC。结果表明,mCP薄膜中QAO的明亮TADF在BP晶体中转化为RTP,理论预测与实验发射光谱和RTP寿命吻合良好。这些发现为高性能磁共振基RTP材料的分子设计提供了基本见解,为下一代有机光电应用铺平了道路。
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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