Fluorene vs. Spirobifluorene: Effect of the π‐System on TADF Properties

IF 3 4区 化学 Q3 CHEMISTRY, PHYSICAL ChemPhotoChem Pub Date : 2024-09-12 DOI:10.1002/cptc.202400235
Tim Silies, Nikos L. Doltsinis, Constantin G. Daniliuc, Fabio Rizzo
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Abstract

There are many options to design a molecular structure that could result in thermally activated delayed fluorescence (TADF). One promising strategy is to use the donor‐π‐acceptor motive where an electron‐donating unit is linked to an electron‐acceptor via an aryl moiety like phenyl. While this approach is widely used and well understood, the performance of the chromophores can be limited by different energy loss pathways, e.g. internal conversion or by π‐stacking. To circumvent these problems rigid structures with sterically demanding substituents are applied. In this work, we designed two TADF emitters based on phenothiazine and nitrile linked via spiro‐9,9’‐bi[fluorene] or 9,9‐dimethylfluorene and compared the effect of the linker on the physical properties of the dyes. This work emphasizes the importance of careful design of conjugated spacer for efficient TADF emitters.
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芴与螺二芴:π-系统对 TADF 性能的影响
设计一种可产生热激活延迟荧光(TADF)的分子结构有很多选择。一种很有前景的策略是使用供体-π-受体动机,即通过苯基等芳基将一个电子供体单元与一个电子受体相连。虽然这种方法得到了广泛应用和深入理解,但发色团的性能会受到不同能量损失途径的限制,例如内部转换或π堆叠。为了规避这些问题,我们采用了具有严格立体要求的取代基的刚性结构。在这项工作中,我们设计了两种基于吩噻嗪和腈通过螺-9,9'-双[芴]或 9,9-二甲基芴连接的 TADF 发射器,并比较了连接物对染料物理性质的影响。这项工作强调了精心设计共轭间隔物对于高效 TADF 发射器的重要性。
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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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