应用于稳定有机磷光二极管的三嗪基电子传输材料  

Triazine-based electron-transport material for stable phosphorescent organic light-emitting diodes

作　　者：陈玲玲 王林叶 肖曙 邹建华 朱旭辉[1] 马东阁 CHEN Ling-ling;WANG Lin-ye;XIAO Shu;ZOU Jian-hua;ZHU Xu-hui;MA Dong-ge(State Key Laboratory of Luminescent Materials and Devices,Institute of Polymer Optoelectronic Materials and Devices,South China University of Technology,Guangzhou 510640,China;Guangzhou New vision Opto-Electronic Technology Co.,Ltd.,Guangzhou 510730,China)

机构地区：[1]华南理工大学发光材料与器件国家重点实验室,广东广州510640 [2]广州新视界光电科技有限公司,广东广州510730

出　　处：《液晶与显示》2021年第1期53-61,共9页Chinese Journal of Liquid Crystals and Displays

基　　金：国家重点研发计划(No.2016YFB0400701);NFSC-广东联合基金(No.U1801258);广东省重点领域研发计划(No.2019B010924003)。

摘　　要：本文报道了一类面向有机电致磷光器件应用的电子传输材料,其具有易合成纯化、分子量低、玻璃化转变温度高以及经8-羟基喹啉锂(Liq)掺杂,电子迁移率高等优点。通过1,3-亚苯基,4,6-二苯基-1,3,5-三嗪-2-基单元与10-(萘基-2-基)-蒽-9-基偶联,得到分析纯的NaAN-m-TRZ(m/z=611.73)。残留的含溴中间体可以容易地通过柱层析和/或由CH2Cl2重结晶去除,从而避免了高风险卤代杂质对于OLED稳定性的影响。热分析表明,其Tg为157℃;在失重率为1%时,分解温度为353℃。根据紫外光电子能谱测量,NaAN-m-TRZ的HOMO能级为-5.76 eV,其LUMO估算为-2.84 eV。利用空间电荷限制电流模型,经由质量分数为50%Liq掺杂的NaAN-m-TRZ的电子迁移率高达6.23×10-5~7.19×10-4 cm2·V-1·s-1@E=(2~5)×105V·cm-1,有助于抑制磷光OLED器件中的三重态极化子湮灭。因此,基于LiqNaAN-m-TRZ的单层电子传输层,顶发射绿光磷光器件展现出高稳定性,预计寿命t97约为2567 h@1000 cd·m-2;发光效率、功率效率分别为72.2 cd·A-1、81 lm·W-1@1000 cd·m-2(绿光发光材料为Ir(ppy)2(m-mbppy))。An organic electron-transport compound for phosphorescent OLEDs is reported,which possesses the advantages of low molecular weight,enhanced glass transition temperature and electron mobility upon doping with 8-hydroxyquinolatolithium(Liq)as well as facile synthesis and purification.The analytically pure NaAN-m-TRZ(m/z=611.73)is obtained through coupling the 4,6-diphenyl-1,3,5-triazin-2-yl unit via a 1,3-phenylene linker with 10-(naphth-2-yl)-anthracen-9-yl moiety.The residual bromo intermediate could be easily removed by column chromatography and/or recrystallization from CH 2Cl 2,hence eliminating a high-risk factor for OLED stability.Thermal analyses show that it exhibits a T g of 157℃and decomposition temperature of 353℃at 1%weight loss.NaAN-m-TRZ has a HOMO level of-5.76 eV determined by the ultraviolet photoelectron spectroscopy measurement and an estimated LUMO level of-2.84 eV.Doping NaAN-m-TRZ with 50%(mass fraction)Liq yields impressive electron mobility of 6.23×10-5~7.19×10-4 cm 2·V-1·s-1@E=(2~5)×105 V·cm-1 using space-charge-limited current model,which contributes to suppressing triplet-polaron annihilation in the phosphorescent OLEDs.Consequently,based on the single NaAN-m-TRZ∶Liq electron-transport layer,the top-emission green phosphorescent OLED involving Ir(ppy)2(m-mbppy)produces extraordinary durability with projected lifetime t 97 of 2567 h@1000 cd·m-2 as well as a luminous efficiency of 72.2 cd·A-1 and power efficiency of 81 lm·W-1@1000 cd·m-2.

关 键 词：三嗪 蒽 低分子量 玻璃化转变温度 电子迁移率 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TN383+.1[自动化与计算机技术—计算机科学与技术]