Enhanced electroluminescence based on thermally activated delayed fluorescence from a carbazole-triazine derivative

被引：112

作者：

Serevicius, Tomas ^{[1
,2
]}

Nakagawa, Tetsuya ^{[1
]}

Kuo, Ming-Cheng ^{[3
]}

Cheng, Shuo-Hsien ^{[3
]}

Wong, Ken-Tsung ^{[3
]}

Chang, Chih-Hao ^{[4
]}

Kwong, Raymond C. ^{[5
]}

Xia, Sean ^{[5
]}

Adachi, Chihaya ^{[1
,6
,7
]}

机构：

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

[2] Vilnius State Univ, Inst Appl Res, LT-10222 Vilnius, Lithuania

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

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

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

[6] Kyushu Univ, Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan

[7] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 38期

基金：

日本学术振兴会;

关键词：

LIGHT-EMITTING-DIODES; PHOSPHORESCENT OLEDS; HOST MATERIALS; EFFICIENCY; COMPLEXES;

D O I：

10.1039/c3cp52255e

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：

Thermally activated delayed fluorescence (TADF) properties of a dicarbazole-triazine compound, 9-(4,6diphenyl-1,3,5-triazin-2-yl)-9'-phenyl-3,3'-bicarbazole (CzT), and its OLED characteristics were investigated. An estimated small energy gap of about 90 meV between the singlet and triplet energy states of CzT made the up-conversion of triplet excitons back to a singlet state possible. The origin of the observed delayed fluorescence has been shown to be thermally activated delayed fluorescence. An organic light emitting diode (OLED) with CzT as an emitter showed the maximum external quantum efficiency (EQE) of 6%. For comparison, another carbazole-triazine derivative of 3-(2'-( 4,6-diphenyl-1,3,5-triazin-2-yl)[1,1'-biphenyl]-2-yl)-9-phenyl-9H-carbazole (PhCzTAZ) with a similar structure was also studied. PhCzTAZ showed a low fluorescence quantum yield with no TADF.

引用

页码：15850 / 15855

页数：6

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