Highly efficient phosphorescent blue and white organic light-emitting devices with simplified architectures

被引：17

作者：

Chang, Chih-Hao ^{[1
]}

Ding, Yong-Shung ^{[1
]}

Hsieh, Po-Wei ^{[1
]}

Chang, Chien-Ping ^{[1
]}

Lin, Wei-Chieh ^{[1
]}

Chang, Hsin-Hua ^{[2
]}

机构：

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

[2] Vanung Univ, Dept Electroopt Engn, Chungli 32061, Taiwan

来源：

THIN SOLID FILMS | 2011年 / 519卷 / 22期

关键词：

Organic light-emitting devices; Architecture; Phosphorescence; Electroluminescence; ELECTROLUMINESCENT DEVICES; HOST MATERIAL; ELECTROPHOSPHORESCENT DEVICES; ENERGY-TRANSFER; ELECTRIC-FIELD; OLEDS; DIODES; COMPLEXES; EMISSION; OXIDE;

D O I：

10.1016/j.tsf.2011.05.061

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Blue phosphorescent organic light-emitting devices (PhOLEDs) with quantum efficiency close to the theoretical maximum were achieved by utilizing a double-layer architecture. Two wide-triplet-gap materials, 1,3-bis(9-carbazolyl)benzene and 1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene, were employed in the emitting and electron-transport layers respectively. The opposite carrier-transport characteristics of these two materials were leveraged to define the exciton formation zone and thus increase the probability of recombination. The efficiency at practical luminance (100 cd/m(2)) was as high as 20.8%, 47.7 cd/A and 31.2 Im/W, respectively. Furthermore, based on the design concept of this simplified architecture, efficient warmish-white PhOLEDs were developed. Such two-component white organic light-emitting devices exhibited rather stable colors over a wide brightness range and yielded electroluminescence efficiencies of 15.3%, 33.3 cd/A, and 22.7 Im/W in the forward directions. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：7992 / 7997

页数：6