Thermally Activated Delayed Fluorescence Warm White Organic Light Emitting Devices with External Quantum Efficiencies Over 30%,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. 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.)

Thermally Activated Delayed Fluorescence Warm White Organic Light Emitting Devices with External Quantum Efficiencies Over 30%
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-05-31 , DOI: 10.1002/adfm.202101647
Jia‐Xiong Chen _{1,

2,

3} , Kai Wang ₁ , Ya‐Fang Xiao ₂ , Chen Cao ₂ , Ji‐Hua Tan ₂ , Hui Wang ₁ , Xiao‐Chun Fan ₁ , Jia Yu ₁ , Feng‐Xia Geng ₃ , Xiao‐Hong Zhang ₁ , Chun‐Sing Lee ₂

Affiliation

While monochrome organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) emitters have achieved over 30% external quantum efficiencies (EQEs), all-TADF white OLEDs (WOLEDs) are still lagging behind. Herein, a simple system based on two color-complementary TADF emitters is exploited to realize high-performance WOLEDs. By doping a high-performance orange–red TADF fluorophor (BPPZ-DPXZ) into a blue TADF host (DBFCz-Trz), energy transfer, and triplet-to-singlet conversion in the host-dopant system can be optimized to simultaneously achieve full exciton utilization and color balance. With this design, all-TADF single-emitting-layer WOLEDs with a maximum EQE up to 32.8% are demonstrated. This high efficiency surpasses EQEs of reported WOLEDs based on both TADF as well as phosphorescence. It is expected that this finding can provide new insight for designing highly efficient all-TADF WOLEDs.

中文翻译：

外量子效率超过 30% 的热激活延迟荧光暖白色有机发光器件

虽然基于热激活延迟荧光 (TADF) 发射器的单色有机发光二极管 (OLED) 已实现超过 30% 的外部量子效率 (EQE)，但全 TADF 白色 OLED (WOLED) 仍然落后。在此，基于两个颜色互补的 TADF 发射器的简单系统被用来实现高性能 WOLED。通过将高性能橙红色 TADF 荧光团 (BPPZ-DPXZ) 掺杂到蓝色 TADF 主体 (DBFCz-Trz) 中，可以优化主体 - 掺杂剂系统中的能量转移和三重态到单重态的转换，以同时实现完全激子利用和色彩平衡。通过这种设计，展示了最大 EQE 高达 32.8% 的全 TADF 单发射层 WOLED。这种高效率超过了报道的基于 TADF 和磷光的 WOLED 的 EQE。

更新日期：2021-08-05

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南