Thermally Activated Delayed Fluorescence Polysiloxanes with Short Delay Fluorescence Lifetimes,Macromolecular Rapid Communications

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Thermally Activated Delayed Fluorescence Polysiloxanes with Short Delay Fluorescence Lifetimes
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2022-02-25 , DOI: 10.1002/marc.202200064
Silu Liu ₁ , Quanwei Li ₁ , Lei Hua ₁ , Zhennan Zhao ₁ , Zhongjie Ren ₁ , Shouke Yan _{1,

2}

Affiliation

Blue-emitting thermally activated delayed fluorescence (TADF) polymers are still in demand for high-efficiency display materials. Through-space charge transfer (TSCT) strategy is promising for keeping color purity of blue-emitting polymers with nonconjugated main chains. It is, however, hard to synthesize copolymers with well-dispersed donors or acceptors utilizing traditional polyethylene backbones via radical polymerization. Herein, two series of blue-emitting polysiloxane with TADF properties, random and order-controlled copolysiloxanes, are successfully designed and synthesized and their photophysical properties are investigated and compared in detail. All of them display short prompt and delay fluorescence lifetimes and a very fast reverse intersystem crossing (RISC) rate of 10⁷ s⁻¹. Compared with random copolysiloxanes, acceptors are well separated by donors for order-controlled copolysiloxanes, which exhibit the faster RISC processes and the higher photoluminescence quantum yield. Therefore, the order-controlled architecture provides a guide for improving light-emitting efficiency of TSCT-type TADF polymers.

中文翻译：

延迟荧光寿命短的热活化延迟荧光聚硅氧烷

高效显示材料仍然需要发蓝光的热激活延迟荧光 (TADF) 聚合物。空间电荷转移 (TSCT) 策略有望保持具有非共轭主链的蓝色发光聚合物的颜色纯度。然而，利用传统的聚乙烯骨架通过自由基聚合来合成具有良好分散的供体或受体的共聚物是很困难的。在此，成功设计和合成了两种具有 TADF 特性的蓝色发光聚硅氧烷，即随机和有序控制的共聚硅氧烷，并对其光物理性质进行了详细研究和比较。它们都显示出较短的提示和延迟荧光寿命以及非常快的 10 ⁷ s ^{-1反向系统间交叉 (RISC) 速率}. 与无规共聚硅氧烷相比，有序控制的共聚硅氧烷的受主被施主很好地分离，表现出更快的RISC过程和更高的光致发光量子产率。因此，有序控制结构为提高 TSCT 型 TADF 聚合物的发光效率提供了指导。

更新日期：2022-02-25

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