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首页> 外文期刊>Advanced Functional Materials >Manipulating Complementarity of Binary White Thermally Activated Delayed Fluorescence Systems for 100% Exciton Harvesting in OLEDs
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Manipulating Complementarity of Binary White Thermally Activated Delayed Fluorescence Systems for 100% Exciton Harvesting in OLEDs

机译：在OLED中操纵二元白色热活化延迟荧光系统的二元热激活延迟荧光系统的互补性

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Different to fluorescent and phosphorescent counterparts, white thermally activated delayed fluorescence (TADF) involves in multiple reverse intersystem crossing (RISC), leading to the correlation but competition between blue and other color components in both singlet and triplet allocations. Herein, three blue TADF emitters SSFAPO, DSFAPO, and TSFAPO, collectively named xSFAPO are developed, featuring a moderately electron-withdrawing phosphine oxide (P(sic)O) acceptor respectively linked 1-3 donors. Despite nearly identical blue emissions, photoluminescence quantum yields of xSFAPO are proportional to donor number. But, their RISC efficiencies are below 70%, markedly less than 85% of a conventional yellow TADF emitter 2,3,5,6-tetrakis(3,6-di-(tert-butyl)carbazol-9-yl)-1,4-dicyanobenzene (4CzTPNBu). Furthermore, sp(3) hybrid configuration of P(sic)O enlarges steric hindrance of peripheral donor groups. So, Dexter energy transfer is impeded by increasing donor numbers. Among xSFAPO and 4CzTPNBu dually doped white-emitting films, yellow emission from SSFAPO-based film is the strongest, reflecting the predominance of fast Dexter energy transfer in triplet allocation. Therefore, SSFAPO endowed its warm-white organic light-emitting diodes (WOLEDs) with an external quantum efficiency of 25.1%, corresponding to 100% internal quantum efficiency, which are 1.25 and 1.60 folds of those of DSFAPO and TSFAPO-based WOLEDs. These results suggest advantage complementarity of different components is crucial for developing white-emitting systems with 100% exciton utilization.
机译：不同，以荧光和磷光的对应，白色热活化延迟荧光（TADF）涉及在多个反向系间窜越（RISC），导致在这两个单态和三重态分配的相关性，但蓝色和其他颜色成分之间的竞争。这里，三个蓝色TADF发射器SSFAPO，DSFAPO，和TSFAPO，统称为xSFAPO被开发，具有适度吸电子氧化膦（P（原文如此）O）受体分别链接1-3供体。尽管几乎相同的蓝色的排放，xSFAPO的光致发光量子产率正比于供体数。但是，它们的RISC效率是70％以下，常规的黄色TADF的显着小于85％发射极2,3,5,6-四（3,6-二 - （叔丁基）咔唑-9-基）-1- ，4-二氰基苯（4CzTPNBu）。此外，P的SP（3）混合配置（原文如此）O下放大立体周供体基团的位阻。所以，德克斯特能量传递是通过增加供体数量的阻碍。间xSFAPO和4CzTPNBu双重掺杂的发射白光的薄膜，从基于SSFAPO膜黄色发射是最强的，反映了三重态分配快速德克斯特能量转移的优势。因此，SSFAPO赋予其暖白色有机发光二极管（的WOLED），用25.1％的外部量子效率，相应于100％的内部量子效率，这是那些DSFAPO和基于TSFAPO-的WOLED的1.25和1.60倍。这些结果表明不同的组件的优点互补是开发白色发射系统，用100％的激子的利用是至关重要的。

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