Novel donor-spacer-acceptor compound as the multifunctional component of exciplexes for efficient organic light-emitting diodes  

一种新型给体-间隔基-受体结构材料作为多功能组分实现高效激基复合物发光二极管

作　　者：Hao-Yu Yang Cai-Jun Zheng Ming Zhang Jue-Wen Zhao Yi-Zhong Shi Chun-Peng Pu Hui Lin Si-Lu Tao Xiao-Hong Zhang 杨浩宇;郑才俊;张明;赵决文;史益忠;蒲春鹏;林慧;陶斯禄;张晓宏(School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China;Institute of Functional Nano&Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University,Suzhou 215123,China)

机构地区：[1]School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China [2]Institute of Functional Nano&Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University,Suzhou 215123,China

出　　处：《Science China Materials》2022年第2期460-468,共9页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(51773029,52073040,51533005 and 51821002);the Fundamental Research Funds for the Central Universities(ZYGX2016Z010);the International Cooperation and Exchange Project of Science and Technology Department of Sichuan Province(2019YFH0057 and 2019YFH0059)。

摘　　要：By connecting tercarbazole(3 Cz)and triphenyltriazine(TRz)units with a diphenyl ether group,we designed and synthesized a new donor-spacer-acceptor structure molecule9’-(4-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenoxy)phenyl)-9’H-9,3’:6’,9"-tercarbazole(3 Cz-o-TRz)as the multifunctional component of exciplex emitters.As expected,the intermolecular charge-transfer transition is dominant for3 Cz-o-TRz because of the space-enough and conjugation-forbidden linkage of the diphenyl ether group,increasing the intrinsic characteristics of the 3 Cz and TRz moieties in its single-molecule state.Accordingly,three common electron acceptors(4,6-bis(3,5-di(pyridin-3-yl)phenyl)-2-methylpyrimidine(B3 PyMPm),4,6-bis(3,5-di(pyridin-4-yl)phenyl)-2-methylpyrimidine(B4 PyMPm),and(1,3,5-triazine-2,4,6-triyl)tris(benzene-3,1-diyl)tris(diphenylphosphineoxide)(POT2 T))and three common electron donors(4,4’-(cyclohexane-1,1-diyl)bis(N,N-di-p-tolylaniline)(TAPC),tris(4-(10 H-phenoxazin-10-yl)phenyl)amine(TPA-PXZ),and N1-phenyl-N4,N4-bis(4-(phenyl(m-tolyl)amino)phenyl)-N1-(m-tolyl)benzene-1,4-diamine(m-MTDATA))were chosen to construct six exciplex emitters with 3 Cz-o-TRz.In the organic light-emitting diodes(OLEDs),the emission spectra of these exciplex emitters could be gradually modulated from 510 to 590 nm.In addition,TAPC:3 Cz-o-TRz-and 3 Cz-o-TRz:PO-T2 T-based OLEDs achieved desirable performance with maximum external quantum efficiencies(EQEs)around 12%.Moreover,a simple tandem OLED containing TAPC:3 Cz-o-TRz and 3 Czo-TRz:PO-T2 T emitters realized optimal performance with an ultralow turn-on voltage of 2.4 V and a maximum EQE of14.1%.These results indicate the great potential of the donorspacer-acceptor structure compounds in developing exciplex emitters.为了实现高效的激基复合物发光二极管(OLED),我们设计并合成了一种新型给体-间隔基-受体(D-Spacer-A)结构分子3Cz-o-TRz.通过引入二苯醚基团作为间隔基,可以有效地抑制3Cz-o-TRz分子内的电荷转移过程,使其在单分子态下能够同时表现出给体和受体片段的本征特性,从而能够作为多功能组分来构建激基复合物.基于此,3Cz-oTRz分别与不同的受体材料和给体材料结合,构建了六种激基复合物发光分子.其中,基于3Cz-o-TRz分别作为给体和受体组分所构建的激基复合物OLED器件均实现了最大外部量子效率(EQE)约为12%的性能.并且,通过串联激基复合物TAPC:3Cz-o-TRz和3Cz-o-TRz:PO-T2T为发光分子进一步提高了器件性能,最大EQE可达14.1%.我们的工作证明了具有D-Spacer-A结构的分子在构建激基复合物OLED中具有巨大潜力.

关 键 词：EXCIPLEX donor-spacer-acceptor structure intermolecular charge-transfer organic light-emitting diode multifunctional component 

分 类 号：TB30[一般工业技术—材料科学与工程] TN312.8[电子电信—物理电子学]