Efficient,deep red phosphorescent OLEDs using 1,2,4-thiadiazole core-based novel bipolar host with low efficiency roll-off

查看全文 作　　者：Runda [1]GUO;Wenzhi [1]ZHANG;Qing [1]ZHANG;Xialei [1]LV;Lei [1]WANG

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Frontiers of Optoelectronics》索引2018年第11卷第4期,共10页

基　　金：the National Natural Science Foundation of China (Grant Nos.51573065and 51727809),China Postdoctoral Science Foundation (No.2017M620321);the science and technology support program of Hubei Province (No.2015BAA075);the Fundamental Research Funds for the Central Universities,HUST (No. 2018KFYXKJC043). 摘　　要：A series of 1,2,4-thiadiazole core-based bipolar materials,2,2'-(1,2,4-thiadiazole-3,5-diyl)bis(N,N- diphenylaniline)(o-TPATHZ),3,3'-(1,2,4-thiadiazole-3,5-diyl)bis(N,N-diphenylaniline)(m-TPATHZ)and 4,4'-(1,2,4-thiadiazole-3,5-diyl)bis(N,N-diphenylaniline)(1)-TPATHZ)were developed as the host matrixes for the deep red phosphorescent emitters tris(1-phenylisoqiuno-line)iridium (It(pie03)and [bis(2-methyldibenzo-[f,h]-quinoxaline)Ir(III)(acetylacetonate)](Ir(MDQ)2(acac)).By systematic studying,we demonstrated that there are two types of charge-trapping effect within the emissive layers through adjusting the host-guest compatibility.And,it is revealed that a symmetric charge-trapping effect can contribute to realizing a stable charge-balance,which led to a mitigating efficiency roll-off at high current density. Consequently,a maximum external quantum efficiency (EQE)of 16.2%was achieved by an optimized device with p-TPATHZ-Ir(piq)3emissive layer.Remarkably,the EQE still remained as high as 15.7%at the high luminance of 1000cd/m^2. 关键词：1 2 4-thiadiazole core low efficiency roll-off DEEP red PHOSPHORESCENT devices symmetrical chargetrapping effect

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Efficient,deep red phosphorescent OLEDs using 1,2,4-thiadiazole core-based novel bipolar host with low efficiency roll-off

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