Promoting through-space charge transfer-based TADF via rational alignment of quasi-planar donor and acceptor in solid state
Source abstract
Abstract
基于空间电荷转移(TSCT)的热激活延迟荧光(TADF)材料因其可同时实现小的单重态-三重态分裂能(ΔEST)和快速的辐射速率(kf)而受到广泛关注, 但对这类材料的合理设计仍面临挑战. 本工作使用极化连续介质模型和量子力学与分子力学结合的方法, 对咔唑基TSCT-TADF材料在液相和固相中的光物理性质进行了理论研究, 阐明其实验性能的差异并揭示分子设计规则. 研究表明给体(D)、 受体(A)单元平面度逐渐增强的分子表现出D和A单元之间的距离减小、 分子内相互作用增强, 导致其在固相中有利的辐射过程; 并且A单元平面度的增强显著限制了分子的拉伸和旋转振动, 减少了非辐射损失, 有助于分子性能的提高. 此外, 这类分子的前线轨道分布显示出明显的分离, 有利于实现较小的ΔEST. 这些新的理论认识可以对TSCT-TADF材料的结构-性能关系提供深入的光物理见解, 为设计和探索高性能TADF材料提供有效策略.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Photochemistry and Electron Transfer Studies · Luminescence and Fluorescent Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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