液晶与显示2021，Vol.36Issue(1)：53-61,9.DOI:10.37188/CJLCD.2020-0237
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
摘要
Abstract
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 CH2Cl2,hence eliminating a high-risk factor for OLED stability.Thermal analyses show that it exhibits a Tg 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 cm2 · V-1 · s-1@E =(2 ～ 5)× 105V · 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 t97 of 2 567 h@1 000 cd · m-2 as well as a luminous efficiency of 72.2 cd · A-1 and power efficiency of 81 lm · W-1@1 000 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Key words
triazines/anthracenes/low molecular weight/glass transition temperature/electron mobility分类
信息技术与安全科学引用本文复制引用
陈玲玲,王林叶,肖曙,邹建华,朱旭辉,马东阁..应用于稳定有机磷光二极管的三嗪基电子传输材料[J].液晶与显示,2021,36(1):53-61,9.基金项目
国家重点研发计划(No.2016YFB0400701) （No.2016YFB0400701）
NFSC-广东联合基金(No.U1801258) （No.U1801258）
广东省重点领域研发计划(No.2019B010924003)Supported by National Key R & D Program of China (No.2016YFB0400701) （No.2019B010924003）
NSFC-Guangdong Joint Program (No.U1801258) （No.U1801258）
Key-Area Research and Development Program of Guangdong Province (No.2019B010924003). （No.2019B010924003）
