δ-Carboline-based bipolar host materials for deep blue thermally activated delayed fluorescence OLEDs with high efficiency and low roll-off characteristic
作者:Ji Su Moon、Dae Hyun Ahn、Si Woo Kim、Seung Yeon Lee、Ju Young Lee、Jang Hyuk Kwon
DOI:10.1039/c8ra01761a
日期:——
results in high delayed photoluminescence quantum yields by reducing the energy gap between singlet and triplet states of TADF materials. In addition, these hosts have high enough triplet energies of 3.05 eV to transfer exciton energy to a deep blue TADF emitter. A deep blue TADF OLED fabricated with a CzCbPy host exhibited high external quantum efficiency of 22.9% and low efficiency roll-off (19.2% at
两种双极性主体材料,8-(9 H -carbazol-9-yl)-5-(pyridin-2-yl)-5 H -pyrido [3,2 - b ]indole ( CzCbPy ) 和 5-(6-( 9 H -carbazol-9-yl)pyridin-2-yl)-8-(9 H -carbazol -9-yl)-5 H -pyrido [3,2 - b ]indole ( 2CzCbPy ), 合成深蓝热激活延迟荧光有机发光二极管(TADF OLED)。CzCbPy和2CzCbPy _主体具有高极性的双极特性,通过减少TADF材料的单重态和三重态之间的能隙,从而导致高延迟光致发光量子产率。此外,这些主体具有足够高的 3.05 eV 三重态能量,可以将激子能量转移到深蓝色 TADF 发射器。用CzCbPy主体制造的深蓝色 TADF OLED表现出 22.9% 的高外部量子效率和低效率滚降(在 1000
JP5741091
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