Highly Robust Cu(I)-TADF Emitters for Vacuum-deposited OLEDs with Luminance up to 222,200 cdm-2 and Device Lifetimes (LT90) up to 1,300 hours at an Initial Luminance of 1,000 cdm-2.
Highly Robust Cu(I)-TADF Emitters for Vacuum-deposited OLEDs with Luminance up to 222,200 cdm-2 and Device Lifetimes (LT90) up to 1,300 hours at an Initial Luminance of 1,000 cdm-2.
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适用于真空沉积 OLED 的高鲁棒性 Cu(I)-TADF 发射器，亮度高达 222,200 cdm-2，初始亮度为 1,000 cdm-2 时器件寿命 (LT90) 长达 1,300 小时。
DOI：
10.1002/anie.202203982
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发表时间：
2022
影响因子：
--
通讯作者：
C. Che
中科院分区：
文献类型：
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作者：
R. Tang;Shuo Xu;T. Lam;Gang Cheng;L. Du;Qingyun Wan;J. Yang;Faan;Kam;D. Phillips;C. Che
铜基有机发光二极管（OLED）的实际应用的关键步骤是弥合器件效率和实际亮度下的操作稳定性之间的巨大差距。描述了一组空气和热稳定的双配位Cu（I）发射体，其特征在于具有增强的酰胺-Cu-卡宾键合相互作用的大体积吡嗪-（PzIPr）或吡啶-稠合的N-杂环卡宾（PyIPr*）和咔唑（Cz）配体。这些Cu（I）发光体显示出1 LL'CT（Cz->PzIPr/PyIPr*）激发态的热激活延迟荧光（TADF），其辐射速率常数为1.1-2.2× 106 s-1。基于这些Cu（I）发光体的气相沉积OLED显示出优异的外量子效率和亮度，分别高达23.6%和222，200 cd m-2，同时在我们的实验室条件下，在1，000 cd m-2下记录器件寿命（LT 90）高达1，300 h，突出了Cu（I）-TADF发光体的实用性。
A critical step in advancing the practical application of copper-based organic light-emitting diodes (OLEDs) is to bridge the large gap between device efficiency and operational stability at practical luminance. Described is a panel of air- and thermally stable two-coordinate Cu(I) emitters featuring bulky pyrazine- (PzIPr) or pyridine-fused N-heterocyclic carbene (PyIPr*) and carbazole (Cz) ligands with enhanced amide-Cu-carbene bonding interactions. These Cu(I) emitters display thermally activated delayed fluorescence (TADF) from the 1 LL'CT(Cz->PzIPr/PyIPr*) excited states across the blue to red regions with exceptional radiative rate constants of 1.1-2.2×10 6 s -1 . Vapour-deposited OLEDs based on these Cu(I) emitters showed excellent external quantum efficiencies and luminance up to 23.6% and 222,200 cd m -2 , respectively, alongside record device lifetimes (LT 90 ) up to 1,300 h at 1,000 cd m -2 under our laboratory conditions, highlighting the practicality of the Cu(I)-TADF emitters.