Improving Luminescent Performances of Thermally Activated Delayed Fluorescence Conjugated Polymer by Inhibiting the Intra‐ and Interchain Quenching,Advanced Optical Materials

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Improving Luminescent Performances of Thermally Activated Delayed Fluorescence Conjugated Polymer by Inhibiting the Intra‐ and Interchain Quenching
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-03-12 , DOI: 10.1002/adom.201701320
Yunhui Zhu _{1,

2} , Yike Yang _{1,

2} , Yanjie Wang _{1,

2} , Bing Yao ₁ , Xingdong Lin ₁ , Baohua Zhang ₁ , Hongmei Zhan ₁ , Zhiyuan Xie ₁ , Yanxiang Cheng ₁

Affiliation

Suppressing emission quenching is still a real issue for thermally activated delayed fluorescence (TADF) materials as the emitters generally tend to aggregate in condensed film, leading to deteriorating performance in devices. In contrast to the TADF small molecules adopting host–guest systems, polymers possess the advantage that the TADF chromophore can be chemically dispersed into the backbone and thus the quenching process can be inhibited effectively. Here, a strategy applied to the conjugated polymer is presented, in which a TADF chromophore with controlled content is embedded into the backbone of polycarbazole through its donor moiety. The oligomeric carbazole segment acts as the role of “blocking segment,” suppressing the intra‐ and interchain interactions. The polymers therefore exhibit superior photoluminescence quantum yield of up to 92.1%. More importantly, the efficiency roll‐offs of the relevant devices are significantly reduced, offering an external quantum yield (EQE) of 15.6% even at luminance of 1000 cd m⁻², corresponding to 92.3% to the maximum EQE.

中文翻译：

通过抑制链内和链间淬火来提高热活化延迟荧光共轭聚合物的发光性能

对于热激活延迟荧光（TADF）材料，抑制发射猝灭仍然是一个实际问题，因为发射器通常会在冷凝膜中聚集，从而导致器件性能下降。与采用主客体系统的TADF小分子相反，聚合物的优势在于TADF生色团可以化学分散到主链中，因此可以有效地抑制猝灭过程。在此，提出了一种适用于共轭聚合物的策略，其中具有受控含量的TADF生色团通过其供体部分嵌入聚咔唑的主链中。低聚咔唑链段起“封闭链段”的作用，抑制链内和链间相互作用。因此，这些聚合物显示出高达92的优异的光致发光量子产率。1％。更重要的是，即使在1000 cd m的亮度下，相关器件的效率下降也显着降低，可提供15.6％的外部量子产率（EQE）。^-2，相当于最大EQE的92.3％。

更新日期：2018-03-12

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