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

Ling-ling CHEN; Lin-ye WANG; Shu XIAO; Jian-hua ZOU; Xu-hui ZHU; Dong-ge MA

doi:10.37188/CJLCD.2020-0237

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

Organic Light-Emitting Materials and Devices | 更新时间：2021-02-01

- Triazine-based electron-transport material for stable phosphorescent organic light-emitting diodes
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 1, Pages: 53-61(2021)
- 作者机构：
  
  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
- 作者简介：
  
  [ "陈玲玲 (1992-)，女，四川成都人，博士，2020年于华南理工大学获得博士学位，主要从事有机小分子电子传输材料的设计合成及其在OLED中的应用研究。E-mail: chenlingling0301@126.com" ]
  [ "邹建华(1983-)，男，博士，研究员，2010年于华南理工大学获得博士学位，主要从事高性能OLED器件、白光照明、柔性OLED显示屏彩色化实现方案以及喷墨打印OLED器件的技术研究。E-mail: zjh@newvision-cn.com" ]
  [ "朱旭辉 (1972-)，男，博士，教授，2000年于南京大学获得博士学位，先后在德国Martin-Luther-Universät Halle-Wittenberg，法国Université d’Angers和复旦大学从事博士后工作，主要研究方向为有机、无机、有机-无机杂化光电材料及其应用。E-mail: xuhuizhu@scut.edu.cn" ]
- 基金信息：
  
  国家重点研发计划;NFSC-广东联合基金;广东省重点领域研发计划
- DOI：10.37188/CJLCD.2020-0237
  CLC： TP394.1;TN383.1
- Received：14 September 2020，
  
  Accepted：27 September 2020，
  
  Published：2021-01
- 稿件说明：
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Ling-ling CHEN, Lin-ye WANG, Shu XIAO, et al. Triazine-based electron-transport material for stable phosphorescent organic light-emitting diodes[J]. Chinese journal of liquid crystals and displays, 2021, 36(1): 53-61.
DOI：

Ling-ling CHEN, Lin-ye WANG, Shu XIAO, et al. Triazine-based electron-transport material for stable phosphorescent organic light-emitting diodes[J]. Chinese journal of liquid crystals and displays, 2021, 36(1): 53-61. DOI： 10.37188/CJLCD.2020-0237.

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-

-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CH

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

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-

-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-

-TRZ的电子迁移率高达6.23×10

-5

~7.19×10

-4

·V

-1

·s

-1

=(2~5)×10

V·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Liq：NaAN-

-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

约为2 567 h@1 000 cd·m

-2

；发光效率、功率效率分别为72.2 cd·A

-1

、81 lm·W

-1

@1 000 cd·m

-2

(绿光发光材料为Ir(ppy)

(

-mbppy))。

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-

-TRZ (

m/z

=611.73) is obtained through coupling the 4

6-diphenyl-1

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

hence eliminating a high-risk factor for OLED stability. Thermal analyses show that it exhibits a

of 157℃ and decomposition temperature of 353℃ at 1% weight loss. NaAN-

-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-

-TRZ with 50% (mass fraction) Liq yields impressive electron mobility of 6.23×10

-5

~7.19×10

-4

·V

-1

·s

-1

=(2~5)×10

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-

-TRZ:Liq electron-transport layer

the top-emission green phosphorescent OLED involving Ir(ppy)

(

-mbppy) produces extraordinary durability with projected lifetime

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

Keywords

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Related Author

Ling-ling CHEN

Lin-ye WANG

Jian-hua ZOU

Xu-hui ZHU

Related Institution

State Key Laboratory of Luminescent Materials and Devices， Institute of Polymer Optoelectronic Materials and Devices， South China University of Technology （SCUT）

Guangzhou New Vision Opto-Electronic Technology Co.， Ltd.

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