Acceptor-Donor-Acceptor π-Stacking Boosts Intramolecular Through-Space Charge Transfer towards Efficient Red TADF and High-PerformanceOLEDS
作者机构：Shenzhen Key Laboratory of New Information Display and Storage MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China
出 版 物：《Research》 (研究（英文）)
年 卷 期：2022年第2022卷第4期
页 面：283-294页
核心收录：
学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：This work was supported by the National Natural Science Foundation of China(21801170) Guangdong Basic and Applied Basic Research Foundation(2021A1515010175) Shenzhen Science and Technology Program(JCYJ20190808172203553 and ZDSYS20210623091813040) K.L.acknowledges support from the Department of Science and Technology of Guangdong Province(2019QN01C617)
摘 要：Organic push-pull systems featuring through-space charge transfer(TSCT)excited states have been disclosed to be capable of exhibiting thermally activated delayed fluorescence(TADF),but to realize high-efficiency long-wavelength emission still remains a ***,we report a series of strongly emissive orange-red and red TSCT-TADF emitters having(quasi)planar and rigid donor and acceptor segments which are placed in close proximity and orientated in a cofacial *** maxima(λ_(em))of 594−599 nm with photoluminescence quantum yields(PLQYs)of up to 91%and delayed fluorescence lifetimes of down to 4.9μs have been achieved for new acceptor-donor-acceptor(A-D-A)molecules in doped thin *** presence of multiple acceptors and the strong intramolecularπ-stacking interactions have been unveiled to be crucial for the efficient low-energy TSCT-TADF *** light-emitting diodes(OLEDs)based on the new A-D-A emitters demonstrated electroluminescence with maximum external quantum efficiencies(EQEs)of up to 23.2%for the red TSCT-TADF *** EQE of 18.9%at the brightness of 1000 cd m^(-2) represents one of the highest values for red TADF *** work demonstrates a modular approach for developing high-performance red TADF emitters through engineering through-space interactions,and it may also provide implications to the design of TADF emitter with other colours.
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