当前位置：
X-MOL 学术
›
Adv. Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Development of Pure Green Thermally Activated Delayed Fluorescence Material by Cyano Substitution
Advanced Materials ( IF 27.4 ) Pub Date : 2022-06-20 , DOI: 10.1002/adma.202201778 Susumu Oda 1 , Takumi Sugitani 1 , Hiroyuki Tanaka 1 , Keita Tabata 1 , Ryosuke Kawasumi 2 , Takuji Hatakeyama 3
Advanced Materials ( IF 27.4 ) Pub Date : 2022-06-20 , DOI: 10.1002/adma.202201778 Susumu Oda 1 , Takumi Sugitani 1 , Hiroyuki Tanaka 1 , Keita Tabata 1 , Ryosuke Kawasumi 2 , Takuji Hatakeyama 3
Affiliation
|
Multiple resonance (MR)-effect-induced thermally activated delayed fluorescence (TADF) materials have garnered significant attention because they can achieve both high color purity and high external quantum efficiency (EQE). However, the reported green-emitting MR-TADF materials exhibit broader emission compared to those of blue-emitting ones and suffer from severe efficiency roll-off due to insufficient rate constants of reverse intersystem crossing process (kRISC). Herein, a pure green MR-TADF material (ν-DABNA-CN-Me) with high kRISC of 105 s−1 is reported. The key to success is introduction of cyano groups into a blue-emitting MR-TADF material (ν-DABNA), which causes remarkable bathochromic shift without a loss of color purity. The organic light-emitting diode employing it as an emitter exhibits green emission at 504 nm with a small full-width at half-maximum of 23 nm, corresponding to Commission Internationale d'Éclairage coordinates of (0.13, 0.65). The device achieves a high maximum EQE of 31.9% and successfully suppresses the efficiency roll-off at a high luminance.
中文翻译：
氰基取代纯绿色热激活延迟荧光材料的研制
多重共振 (MR) 效应诱导的热激活延迟荧光 (TADF) 材料因其可以同时实现高色纯度和高外量子效率 (EQE) 而备受关注。然而，与蓝色发光材料相比，已报道的绿色发光 MR-TADF 材料具有更宽的发射范围，并且由于反向系统间交叉过程 ( k RISC ) 的速率常数不足，效率会严重下降。在此，报道了具有10 5 s -1的高k RISC的纯绿色MR-TADF材料( ν-DABNA-CN-Me ) 。成功的关键是将氰基引入蓝色发射 MR-TADF 材料（ν-DABNA)，这会导致显着的红移，而不会损失颜色纯度。使用它作为发射器的有机发光二极管在 504 nm 处显示绿色发射，半峰全宽为 23 nm，对应于国际照明委员会坐标 (0.13, 0.65)。该器件实现了 31.9% 的高最大 EQE，并成功抑制了高亮度下的效率滚降。
更新日期：2022-06-20
中文翻译：
氰基取代纯绿色热激活延迟荧光材料的研制
多重共振 (MR) 效应诱导的热激活延迟荧光 (TADF) 材料因其可以同时实现高色纯度和高外量子效率 (EQE) 而备受关注。然而，与蓝色发光材料相比，已报道的绿色发光 MR-TADF 材料具有更宽的发射范围，并且由于反向系统间交叉过程 ( k RISC ) 的速率常数不足，效率会严重下降。在此，报道了具有10 5 s -1的高k RISC的纯绿色MR-TADF材料( ν-DABNA-CN-Me ) 。成功的关键是将氰基引入蓝色发射 MR-TADF 材料（ν-DABNA)，这会导致显着的红移，而不会损失颜色纯度。使用它作为发射器的有机发光二极管在 504 nm 处显示绿色发射，半峰全宽为 23 nm，对应于国际照明委员会坐标 (0.13, 0.65)。该器件实现了 31.9% 的高最大 EQE，并成功抑制了高亮度下的效率滚降。
京公网安备 11010802027423号