Efficient low-molecule phosphorescent organic light-emitting diodes fabricated by wet-processing

被引：34

作者：

Hino, Y ^{[1
]}

Kajii, H ^{[1
]}

Ohmori, Y ^{[1
]}

机构：

[1] Osaka Univ, Res Ctr Adv Sci & Inovat CASI, Suita, Osaka 5650871, Japan

来源：

ORGANIC ELECTRONICS | 2004年 / 5卷 / 05期

关键词：

TDAPB; starburst molecule; phosphorescent material; organic light-emitting diode; simple device structure; wet-processing;

D O I：

10.1016/j.orgel.2004.07.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate high efficiency electrophosphorescence in organic light-emitting devices employing a phosphorescent dye doped into a low-molecule material. Methoxy-substituted 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB) was selected as the host material for the phosphorescent dopant fac-tris(2-phenylpyridine) iridium(III) [Ir(ppy)(3)], and organic films were fabricated by spin-coating. A peak external quantum efficiency of 8.2% (29 cd/A), luminous power efficiency of 17.3 lm/W, and luminance of 33,000 cd/m(2) were achieved at 9.4 V with a 90 nm-thick emitting layer. Emission from the host TDAPB material was not observed in the electroluminescence (EL) and photoluminescence (PL) spectra. The decrease in efficiencies at a high current is analyzed using the triplet-triplet annihilation model. The high performance for the simple device structure in this study is attributed to excellent film forming properties of the material and efficient energy transfer from the host to dopants. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：265 / 270

页数：6

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