Alcohol-Soluble Electron-Transport Materials for Fully Solution-Processed Green PhOLEDs

被引:12
作者
Chen, Fudong [1 ,2 ]
Wang, Shirong [1 ,2 ]
Xiao, Yin [1 ,2 ]
Peng, Feng [3 ]
Zhou, Nonglin [1 ,2 ]
Ying, Lei [3 ]
Li, Xianggao [1 ,2 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
[2] Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China
[3] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
关键词
electron-transport materials; light-emitting diodes; materials science; nitrogen heterocycles; phosphorescence; LIGHT-EMITTING-DIODES; EFFICIENT BLUE; BIPOLAR HOST; DERIVATIVES; DEVICES; ELECTROLUMINESCENCE; FABRICATION; MOLECULE; MOBILITY; POLYMER;
D O I
10.1002/asia.201800320
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Two alcohol-soluble electron-transport materials (ETMs), diphenyl(4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)phosphine oxide (pPBIPO) and (3,5-bis(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)diphenylphosphine oxide (mBPBIPO), have been synthesized. The physical properties of these ETMs were investigated and they both exhibited high electron-transport mobilities (1.67x10(-4) and 2.15x10(-4)cm(2)V(-1)s(-1)), high glass-transition temperatures (81 and 110 degrees C), and low LUMO energy levels (-2.87 and -2.82eV, respectively). The solubility of PBIPO in n-butyl alcohol was more than 20mgmL(-1), which meets the requirement for fully solution-processed organic light-emitting diodes (OLEDs). Fully solution-processed green-phosphorescent OLEDs were fabricated by using alcohol-soluble PBIPO as electron-transport layers (ETLs), and they exhibited high current efficiencies, power efficiencies, and external quantum efficiencies of up to 38.43cdA(-1), 26.64lmW(-1), and 10.87%, respectively. Compared with devices that did not contain PBIPO as an ETM, the performance of these devices was much improved, which indicated the excellent electron-transport properties of PBIPO.
引用
收藏
页码:1335 / 1341
页数:7
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