Highly efficient, deep-blue phosphorescent organic light emitting diodes with a double-emitting layer structure

被引：110

作者：

Fukagawa, H. ^{[1
]}

Watanabe, K. ^{[2
]}

Tsuzuki, T. ^{[1
]}

Tokito, S. ^{[1
]}

机构：

[1] NHK Japan Broadcasting Corp, Setagaya Ku, Tokyo 1578510, Japan

[2] Tokyo Univ Sci, Tokyo 1628610, Japan

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 13期

关键词：

D O I：

10.1063/1.2996572

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have demonstrated a highly efficient, deep-blue organic light-emitting diode (OLED) using a host material with a high triplet energy. The OLED device that we have prepared utilizes a phosphorescent guest material, iridium (III) bis (4', 6',-difluorophenylpyridinato)tetrakis(1-pyrazolyl) borate, exhibits a peak quantum efficiency of about 15.7%. We employed a double-emitting layer (DEL) structure that distributes the carrier recombination region within the device. In this DEL structure, the emission mechanism is such that the energy transfers from the host material in one emitting layer, and the other emitting layer provides for direct charge trapping in the guest material. This DEL structure proved to be quite useful in achieving the reported device characteristics. (C) 2008 American Institute of Physics.

引用

页数：3

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