近日，华南理工大学的赵祖金及其研究团队取得一项新进展。经过不懈努力，他们提出构建高性能蓝色高荧光有机发光二极管的层间敏化策略。相关研究成果已于2024年6月13日在国际知名学术期刊《光：科学与应用》上发表。

该研究团队旨在通过构建层间敏化配置，探索蓝色MR-TADF发射器的有效敏化策略。该策略中，蓝色TADF敏化剂和蓝色MR-TADF发射器分别被精确分配到两个相邻的高极性和低极性主体层中。基于该策略，研究人员采用不同的TADF敏化剂和不同的MR-TADF发射体实现了高效的蓝色高荧光OLED，并对其进行了验证，获得了高达38.8%的外量子效率和窄EL光谱。这些结果验证了这种层间增敏策略的可行性和通用性，为高性能蓝色高荧光OLED提供了有效的替代方案。

据悉，多重共振热激活延迟荧光(MR-TADF)材料是具有窄电致发光(EL)光谱的有机发光二极管(OLEDs)的有前途的候选材料。目前的研究主要集中在制造高荧光OLED，通过在单一主体层中共掺杂TADF敏化剂来提高MR-TADF发射体的EL效率。然而，在许多情况下，单一主体的极性可能不适合蓝色MR-TADF发射器和蓝色TADF敏化剂，导致高极性主体的EL光谱变宽，或低极性主体的EL效率降低。

附：英文原文

Title: Promising interlayer sensitization strategy for the construction of high-performance blue hyperfluorescence OLEDs

Author: Wang, Jianghui, Zou, Peng, Chen, Letian, Bai, Zhentao, Liu, Hao, Chen, Wen-Cheng, Huo, Yanping, Tang, Ben Zhong, Zhao, Zujin

Issue&Volume: 2024-06-13

Abstract: Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are promising candidates for organic light-emitting diodes (OLEDs) with narrow electroluminescence (EL) spectra. Current researches focus on fabricating hyperfluorescence OLEDs to improve EL efficiencies of MR-TADF emitters by co-doping them with TADF sensitizers in a single host layer. However, in many cases, the polarity of the single host could be not suitable for both blue MR-TADF emitters and blue TADF sensitizers, resulting in broadened EL spectra in high-polar hosts or decreased EL efficiencies in low-polar hosts. Herein, we wish to report an efficient sensitization strategy for blue MR-TADF emitters by constructing an interlayer-sensitizing configuration, in which the blue TADF sensitizers and blue MR-TADF emitters are separated into two closely aligned host layers with high polarity and low polarity, respectively. Based on this strategy, efficient blue hyperfluorescence OLEDs are realized and verified by employing various TADF sensitizers and different MR-TADF emitters, furnishing outstanding external quantum efficiencies of up to 38.8% and narrow EL spectra. These results validate the feasibility and universality of this interlayer sensitization strategy, which provides an effective alternative to high-performance blue hyperfluorescence OLEDs.

DOI: 10.1038/s41377-024-01490-6

Source: https://www.nature.com/articles/s41377-024-01490-6