Blue Thermally Activated Delayed Fluorescence‐Emitting Phosphine Oxide Hosts for Ultrasimple and Highly Efficient White Organic Light‐Emitting Diodes,Advanced Optical Materials

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Blue Thermally Activated Delayed Fluorescence‐Emitting Phosphine Oxide Hosts for Ultrasimple and Highly Efficient White Organic Light‐Emitting Diodes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-04-10 , DOI: 10.1002/adom.201800020
Qianqian Liang ₁ , Chunmiao Han ₁ , Chunbo Duan ₁ , Hui Xu ₁

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Among a series of carbazole–diphenylphosphine oxide hybrids x2ArPO, blue thermally activated delayed fluorescence (TADF)‐emitting host m2tBCzPO with optimal electron‐withdrawing and steric effects is successfully constructed to demonstrate the superiority of blue TADF‐emitting host in adaptable exciton allocation for white light‐emitting diodes (WOLEDs), which realizes the negligible singlet–triplet splitting (ΔE_ST) of 0.02 eV, the photoluminescence quantum yield beyond 75% and the top‐rank external quantum efficiency (EQE) with the maxima of 13.8% and 22.2% from its blue and yellow devices. Its high‐efficiency blue TADF emission and excellent host characteristics are perfectly harmonized in its ultrasimple four‐layer WOLED with monodoping single‐emissive layer to support the state‐of‐the‐art performance, including EQE up to 21.3%, roll‐off within 10% at 1000 cd m⁻², and excellent spectral stability.

中文翻译：

蓝色热激活延迟发荧光的氧化膦主体，用于超简单和高效的白色有机发光二极管。

在一系列咔唑-二苯基氧化膦杂化物x 2ArPO中，成功构建了具有最佳吸电子和空间效应的蓝色热活化延迟荧光（TADF）发射宿主m 2tBCzPO，以证明蓝色TADF发射宿主在适应性激子分配方面的优越性用于白光发光二极管（WOLED），实现了可忽略的单重态-三重态分裂（ΔE _ST）0.02 eV时，其蓝色和黄色器件的光致发光量子产率超过75％，并且具有最高的外部量子效率（EQE），最大值分别为13.8％和22.2％。其高效的蓝色TADF发射和出色的宿主特性在其超简单的四层WOLED中实现了完美的协调，该WOLED具有单掺杂单发射层，可支持最先进的性能，包括高达21.3％的EQE，滚降1000 cd m ^-2时为10％，具有出色的光谱稳定性。

更新日期：2018-04-10

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