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首页> 外文期刊>Advanced Materials >Efficient and Stable Deep-Blue Fluorescent Organic Light-Emitting Diodes Employing a Sensitizer with Fast Triplet Upconversion
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Efficient and Stable Deep-Blue Fluorescent Organic Light-Emitting Diodes Employing a Sensitizer with Fast Triplet Upconversion

机译：高效稳定的深蓝色荧光有机发光二极管，采用具有快速三态上的敏化剂的敏化剂

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摘要

Multiple donor-acceptor-type carbazole-benzonitrile derivatives that exhibit thermally activated delayed fluorescence (TADF) are the state of the art in efficiency and stability in sky-blue organic light-emitting diodes. However, such a motif still suffers from low reverse intersystem crossing rates (k(RISC)) with emission peaks 470 nm. Here, a weak acceptor of cyanophenyl is adopted to replace the stronger cyano one to construct blue emitters with multiple donors and acceptors. Both linear donor-pi-donor and acceptor-pi-acceptor structures are observed to facilitate delocalized excited states for enhanced mixing between charge-transfer and locally excited states. Consequently, a high k(RISC) of 2.36 x 10(6) s(-1) with an emission peak of 456 nm and a maximum external quantum efficiency of 22.8% is achieved. When utilizing this material to sensitize a blue multiple-resonance TADF emitter, the corresponding device simultaneously realizes a maximum external quantum efficiency of 32.5%, CIEy approximate to 0.12, a full width at half maximum of 29 nm, and a T80 (time to 80% of the initial luminance) of 60 h at an initial luminance of 1000 cd m(-2).
机译：具有出现热活化的延迟荧光（TADF）的多种供体型咔唑 - 苄腈衍生物是天蓝色有机发光二极管效率和稳定性的技术。然而，这种基序仍然存在低反向线性交叉速率（K（RISC）），发射峰<470nm。这里，采用弱氰基弱受体来取代更强的氰基1，以构建具有多个供体和受体的蓝色发射器。观察到线性供体 - PI-供体和受体 - PI-ActionOR结构，以促进分层激发状态，以增强电荷转移和局部激发态之间的混合。因此，实现了4.36×10（6）秒（-1）的高k（RISC），排放峰值为456nm，最大外量子效率为22.8％。当利用这种材料敏感蓝色多谐振TADF发射器时，相应的装置同时实现了32.5％的最大外部量子效率，Ciey近似为0.12，半最大宽度为29nm，以及T80（时间为80初始亮度的百分比> 60h在1000cd m（-2）的初始亮度下。

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