Improved stability of blue TADF organic electroluminescent diodes via OXD-7 based mixed host  

作　　者：Weiguang LI Jie TANG Yanqiong ZHENG Junbiao PENG Jianhua ZHANG Bin WEI Xifeng LI 

机构地区：[1]Key Laboratory of Advanced Display and System Applications of Ministry of Education,School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200072,China [2]School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China [3]State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China

出　　处：《Frontiers of Optoelectronics》2021年第4期491-498,共8页光电子前沿（英文版）

基　　金：the National Key Research and Development Program of China(No.2017YFB0404404);the Open Fund of State Key Laboratory of Luminescent Materials and Devices(South China University of Technology),China。

摘　　要：Thermally activated delayed fluorescence(TADF)organic light-emitting diodes(OLEDs)have been demonstrated in applications such as displays and solid-state lightings.However,weak stability and ineffi-cient emission of blue TADF OLEDs are two key bottlenecks limiting the development of solution processable displays and white light sources.This work presents a solution-processed OLED using a blue-emitting TADF small molecule bis[4-(9,9-dimethyl-9,10-dihydroacridine)phenyl]sulfone(DMAC-DPS)as an emitter.We comparatively investigated the effects of single host poly(Nvinylcarbazole)(PVK)and a co-host of 60%PVK and 30%2,2′-(1,3-phenylene)-bis[5-(4-tert-butylphenyl)-1,3,4-oxadiazole](OXD-7)on the device performance(the last 10%is emitter DMAC-DPS).The co-host device shows lower turn-on voltage,similar maximum luminance,and much slower external quantum efficiency(EQE)rolloff.In other words,device stability improved by doping OXD-7 into PVK,and the device impedance simultaneously and significantly reduced from 8.6103 to 4.2103 W at 1000 Hz.Finally,the electroluminescent stability of the co-host device was significantly enhanced by adjusting the annealing temperature.

关 键 词：blue thermally activated delayed fluorescence organic light-emitting diode(TADF OLED) 2 2′-(1 3-phenylene)-bis[5-(4-tert-butylphenyl)-1 3 4-oxadiazole](OXD-7) bis[4-(9 9-dimethyl-9 10-dihydroacridine)phenyl]sulfone(DMAC-DPS) STABILITY 

分 类 号：TN312.8[电子电信—物理电子学]