Confinement of triplet energy on phosphorescent molecules for highly-efficient organic blue-light-emitting devices

被引：602

作者：

Tokito, S

Iijima, T

Suzuri, Y

Kita, H

Tsuzuki, T

Sato, F

机构：

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

[2] Tokyo Univ Sci, Tokyo 1628610, Japan

[3] Konica Corp, Hino, Tokyo 1918511, Japan

来源：

APPLIED PHYSICS LETTERS | 2003年 / 83卷 / 03期

关键词：

D O I：

10.1063/1.1594834

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have significantly improved the emission efficiency in an organic light-emitting device (OLED) based on iridium (III)bis[(4,6-di-fluoropheny)-pyridinato-N,C2']picolinate (FIrpic). To improve the efficiency, 4,4'-bis(9-carbazolyl)-2,2'-dimethyl-biphenyl, which has a high triplet energy, was used as the carrier-transporting host for the emissive layer. The FIrpic-based OLED exhibited a maximum external quantum efficiency of 10.4%, corresponding to a current efficiency of 20.4 cd/A, and a maximum power efficiency of 10.5 lm/W. The efficiency was drastically improved compared to that of a previously reported FIrpic-based OLED. This result indicates that triplet energy is efficiently confined on FIrpic molecules, resulting in the high efficiency. (C) 2003 American Institute of Physics.

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页码：569 / 571

页数：3

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