A dicarbazole-triazine hybrid bipolar host material for highly efficient green phosphorescent OLEDs

被引：113

作者：

Chang, Chih-Hao ^{[1
]}

Kuo, Ming-Cheng ^{[2
]}

Lin, Wei-Chieh ^{[1
]}

Chen, Yu-Ting ^{[1
]}

Wong, Ken-Tsung ^{[2
]}

Chou, Shu-Hua ^{[2
]}

Mondal, Ejabul ^{[2
]}

Kwong, Raymond C. ^{[3
]}

Xia, Sean ^{[3
]}

Nakagawa, Tetsuya ^{[4
]}

Adachi, Chihaya ^{[4
]}

机构：

[1] Yuan Ze Univ, Dept Photon Engn, Chungli 32003, Taiwan

[2] Natl Taiwan Univ, Dept Chem, Taipei 10617, Taiwan

[3] Universal Display Corp, Ewing, NJ 08618 USA

[4] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2012年 / 22卷 / 09期

关键词：

LIGHT-EMITTING-DIODES; BLUE; DESIGN;

D O I：

10.1039/c2jm14686j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A novel bipolar host material 9-(4,6-diphenyl-1,3,5-triazin-2-yl)-9'-phenyl-3,3'-bicarbazole (CzT) comprising a dicarbazole donor linking to an electron deficient 1,3,5-triazine acceptor was synthesized and characterized. The molecular design of CzT allows the spatial separation of HOMO and LUMO on the donor and acceptor moieties, respectively, giving sufficient triplet energy (2.67 eV) together with promising physical properties and morphological stability (T-g = 134 degrees C). This tailor-made material was used as a host for an efficient yellowish-green iridium complex, bis(o-tolylpyrimidinato-N,C-2')Ir(III) acetylacetonate [(TPm)(2)Ir(acac)]; the as-fabricated phosphorescent OLEDs (PHOLEDs) demonstrated high performance, with maximum efficiencies of 20.0% (75.7 cd A(-1) and 71.3 lm W-1) and 20.1% (76.3 cd A(-1) and 72.7 lm W-1) achieved in trilayer and bilayer device architectures, respectively. The efficiency of the trilayer device can sustain similar to 20% over a wide brightness range from 10(2) to 10(3) cd m(-2) due to the more effective confinement of emissive excitons within the emitting layer.

引用

页码：3832 / 3838

页数：7

共 33 条

[1] Nearly 100% internal phosphorescence efficiency in an organic light-emitting device [J].