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

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

机构地区：[1]State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates,South China University of Technology,Guangzhou 510640,China. [2]School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China. [3]School of Science and Engineering,Shenzhen Institute of Aggregate Science and Technology,The Chinese University of Hong Kong,Shenzhen,Guangdong 518172,China

出　　处：《Light(Science & Applications)》2024年第7期1372-1382,共11页光（科学与应用)（英文版）

基　　金：the National Natural Science Foundation of China(22375066,U23A20594 and 21788102);the GuangDong Basic and Applied Basic Research Foundation(2023B1515040003 and 2022A1515010315).

摘　　要：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 MRTADF 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.

关 键 词：OLEDS INTERLAYER SENSITIZATION 

分 类 号：O657.3[理学—分析化学]