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Highly Efficient OLEDs by Using a Brominated Thermally Activated Delayed Fluorescent Host due to Balanced Carrier Transport and Enhanced Exciton Upconversion
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-09-20 , DOI: 10.1021/acsami.3c10003
Xiaocui Ma 1 , Jiwei Zhang 1 , Hengyuan Zhang 1 , Ming Zhang 1 , Hui Lin 1 , Caijun Zheng 1 , Xiaoyang Du 1 , Silu Tao 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-09-20 , DOI: 10.1021/acsami.3c10003
Xiaocui Ma 1 , Jiwei Zhang 1 , Hengyuan Zhang 1 , Ming Zhang 1 , Hui Lin 1 , Caijun Zheng 1 , Xiaoyang Du 1 , Silu Tao 1
Affiliation
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Thermally activated delayed fluorescent (TADF) materials are naturally bipolar and can potentially serve as hosts. However, triplet excitons in TADF materials are long-lived and prone to unfavorable bimolecular processes. Implementing an efficient reverse system intersection (RISC) process is an effective solution. Moreover, although the general TADF host is bipolar, polarity differences still cause a mobility imbalance. In this work, we designed and synthesized a novel TADF host material, 11-(3-(4-(3-bromophenyl)-6-phenyl-1,3,5-triazin-2-yl)phenyl)-12,12-dimethyl-11,12-dihydroindeno[2,1-a]carbazole (Br-DMIC-TRZ). The upconversion of the TADF host and its doped films is facilitated due to enhanced spin–orbit coupling (SOC) induced by bromine, which exhibits a higher rate of RISC. This progress facilitates the involvement of more triplet excitons in luminescence. Meanwhile, the attachment of bromine to the acceptor fragment of TADF enhances the electron mobility, where hole mobility and electron mobility are more comparable. Enhanced exciton upconversion and balanced carrier transport allow devices formed based on brominated TADF hosts to outperform other hosts. The Br-TADF-based devices with three dopants sensitized achieved improvements of 29.8, 21.4, and 24.4% compared to the DMIC-TRZ-based device. This work provides a feasible molecular design strategy for further developing efficient hosts.
中文翻译:
使用溴化热激活延迟荧光主体实现平衡载流子传输和增强激子上转换的高效 OLED
热激活延迟荧光 (TADF) 材料本质上是双极性的,可以作为主体。然而,TADF 材料中的三重态激子寿命较长,并且容易发生不利的双分子过程。实施高效的逆向系统交叉(RISC)流程是一种有效的解决方案。而且,虽然一般的TADF宿主是双极性的,但极性差异仍然会导致迁移率不平衡。在这项工作中,我们设计并合成了一种新型的TADF主体材料,11-(3-(4-(3-溴苯基)-6-苯基-1,3,5-三嗪-2-基)苯基)-12,12 -二甲基-11,12-二氢茚并[2,1- a ]咔唑(Br-DMIC-TRZ)。由于溴诱导的自旋轨道耦合(SOC)增强,TADF主体及其掺杂薄膜的上转换得到促进,从而表现出更高的RISC速率。这一进展促进了更多三线态激子参与发光。同时,溴与TADF受体片段的连接增强了电子迁移率,其中空穴迁移率和电子迁移率更具可比性。增强的激子上转换和平衡的载流子传输使得基于溴化TADF主体形成的器件优于其他主体。与基于 DMIC-TRZ 的器件相比,具有三种掺杂剂敏化的基于 Br-TADF 的器件实现了 29.8%、21.4% 和 24.4% 的改进。这项工作为进一步开发高效宿主提供了可行的分子设计策略。
更新日期:2023-09-20
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
使用溴化热激活延迟荧光主体实现平衡载流子传输和增强激子上转换的高效 OLED
热激活延迟荧光 (TADF) 材料本质上是双极性的,可以作为主体。然而,TADF 材料中的三重态激子寿命较长,并且容易发生不利的双分子过程。实施高效的逆向系统交叉(RISC)流程是一种有效的解决方案。而且,虽然一般的TADF宿主是双极性的,但极性差异仍然会导致迁移率不平衡。在这项工作中,我们设计并合成了一种新型的TADF主体材料,11-(3-(4-(3-溴苯基)-6-苯基-1,3,5-三嗪-2-基)苯基)-12,12 -二甲基-11,12-二氢茚并[2,1- a ]咔唑(Br-DMIC-TRZ)。由于溴诱导的自旋轨道耦合(SOC)增强,TADF主体及其掺杂薄膜的上转换得到促进,从而表现出更高的RISC速率。这一进展促进了更多三线态激子参与发光。同时,溴与TADF受体片段的连接增强了电子迁移率,其中空穴迁移率和电子迁移率更具可比性。增强的激子上转换和平衡的载流子传输使得基于溴化TADF主体形成的器件优于其他主体。与基于 DMIC-TRZ 的器件相比,具有三种掺杂剂敏化的基于 Br-TADF 的器件实现了 29.8%、21.4% 和 24.4% 的改进。这项工作为进一步开发高效宿主提供了可行的分子设计策略。