Simultaneous and Significant Improvements in Efficiency and Stability of Deep‐Blue Organic Light Emitting Diodes through Friedel‐Crafts Arylmethylation of a Fluorophore,ChemPhotoChem

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Simultaneous and Significant Improvements in Efficiency and Stability of Deep‐Blue Organic Light Emitting Diodes through Friedel‐Crafts Arylmethylation of a Fluorophore
ChemPhotoChem ( IF 3.0 ) Pub Date : 2020-01-22 , DOI: 10.1002/cptc.201900268
Quanyou Feng ₁ , Kesheng Tan ₁ , Xiaojun Zheng ₁ , Songlin Xie ₁ , Kai Xue ₁ , Yifan Bo ₁ , He Zhang ₁ , Dongqing Lin ₁ , Junfeng Rao ₁ , Xinmiao Xie ₁ , Linghai Xie ₁ , Hongtao Cao ₁ , Hongmei Zhang ₁ , Ying Wei ₁ , Wei Huang _{1,

2}

Affiliation

The molecular design of purely organic fluorophores for highly efficient and stable deep‐blue organic light‐emitting diodes (OLEDs) is still a challenge. Excellent performances in terms of Commission Internationale de l'Eclairage (CIE) coordinates, external quantum efficiency (EQE), brightness and lifespan, often cannot be achieved simultaneously in one deep‐blue OLED. Herein, a novel carbazole‐based thermally activated delayed fluorescence emitter DPFCz‐TRZ is designed and synthesized through Friedel‐Crafts arylmethylation of Cz‐TRZ. Compared with the parent compound Cz‐TRZ, the OLED based on DPFCz‐TRZ exhibits significantly improved performances with a maximum EQE of 15.5 % and brightness beyond 16000 cd m⁻², while retaining similar deep‐blue emission with a CIE coordinate of (0.15, 0.10), an electroluminescence (EL) maximum of λ=445 nm and full width at half maximum (FWHM) of 65 nm. Additionally, the device also shows a respectable lifetime (LT50, time to 50 % of initial luminance) of 78 h at 500 cd m⁻², corresponding to a LT50 of 1304 h at 100 cd m⁻². Impressively, a record high EQE of 5.2 % can be obtained at a very high luminance of 10000 cd m⁻². This work demonstrates the first report of simultaneous achievement over 15 % EQE and 1000 h LT50 (100 cd m⁻²) in deep‐blue purely organic electroluminescence devices with a coordinate of (≤0.15, ≤0.10) and maximum brightness beyond 16000 cd m⁻².

中文翻译：

通过荧光团的Friedel-Crafts芳基甲基化，同时显着提高深蓝色有机发光二极管的效率和稳定性

用于高效和稳定的深蓝色有机发光二极管（OLED）的纯有机荧光团的分子设计仍然是一个挑战。在一种深蓝色OLED中，通常无法同时获得国际照明委员会（CIE）坐标，外部量子效率（EQE），亮度和寿命方面的出色性能。在本文中，一个新的热咔唑系活化延迟荧光发射DPFCz - TRZ被设计并合成通过弗里德尔-克拉夫茨arylmethylation锆石- TRZ。与母体化合物Cz - TRZ相比，基于DPFCz - TRZ的OLED表现出显着改善的性能，最大EQE为15.5％，亮度超过16000 cd m ^-2，同时保持类似的深蓝色发射，CIE坐标为（0.15，0.10），电致发光（EL）最大值为λ = 445 nm，半高全宽（FWHM）为65 nm。此外，该器件在500 cd m ^-2的使用寿命（LT50，达到初始亮度的50％的时间）也显示为78 h ，对应于100 cd m ^-2的LT50为1304 h 。令人印象深刻的是，在10000 cd m ^-2的非常高的亮度下，可以获得5.2％的创纪录的高EQE 。这项工作展示了同时达到15％EQE和1000 h LT50（100 cd m ^-2）在深蓝色的纯有机电致发光器件中，坐标为（≤0.15，≤0.10），最大亮度超过16000 cd m ^-2。

更新日期：2020-01-22

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