Improved color purity and efficiency of blue organic light-emitting diodes via suppression of exciplex formation

被引：35

作者：

Chen, BJ

Zhang, XH

Lin, XQ

Kwong, HL

Wong, NB

Lee, CS

Gambling, WA

Lee, ST ^{[1
]}

机构：

[1] City Univ Hong Kong, COSDAF, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China

[2] City Univ Hong Kong, Optoelect Res Ctr, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China

[3] City Univ Hong Kong, COSDAF, Dept Biol & Chem, Hong Kong, Hong Kong, Peoples R China

[4] Jilin Univ, Dept Elect Engn, State Key Lab Integrated Optoelect, Changchun 130023, Peoples R China

来源：

SYNTHETIC METALS | 2001年 / 118卷 / 1-3期

关键词：

electroluminescence; blue OLED; exciplex;

D O I：

10.1016/S0379-6779(00)00278-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Exciplex emission has been suppressed by doping an emitter in an electron-transporting host in blue organic light-emitting diodes. The dopant, 5,5'-bis(dimesitylboryl)-2,2'-bithiophene (BMB-2T), was a thermally stable electron-transporting material with a high fluorescence quantum efficiency. BMB-2T was doped into a trimer of N-arylbenzimidazoles (TPBI) which functioned as the host and electron-transporting layer. N,N'-bis(3-methylphenyl)-N,N'-diphenyl-{1,1'-biphenyl]-4,4'-diamine (TPD) was used as the hole-transporting layer. The device, with a structure of indium tin oxide (ITO)/TPD/TPBI:BMB-2T/TPBI/Mg:Ag, showed a bright emission of 2200 cd/m(2) at a current density of 240 mA/cm(2) and with a pure blue emission peaking at 446 nm (chromaticity coordinates: x=0.15, y=0.12) at 3 wt.% dopant concentration. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：193 / 196

页数：4

共 20 条

[1] Boron derivatives containing a bithiophene bridge as new materials for non-linear optics [J].