Injection and transport of high current density over 1000A/cm2 in organic light emitting diodes under pulse excitation

被引：47

作者：

Nakanotani, H

Oyamada, T

Kawamura, Y

Sasabe, H

Adachi, C

机构：

[1] CIST, Dept Photon Mat Sci, Chitose, Hokkaido 0668655, Japan

[2] JST, CREST Program, Tokyo 1500011, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2005年 / 44卷 / 6A期

关键词：

organic light-emitting diode; organic laser diode; high current density; pulse voltage; singlet-singlet exciton annihilation;

D O I：

10.1143/JJAP.44.3659

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We succeeded in injecting and transporting a maximum high current density of J = 1163 A/cm(2) in organic light-emitting diodes using short-pulse excitation combined with a highly thermally conductive silicon substrate (thermal conductivity: 148W m(-1) K-1) and a small cathode configuration (cathode radius r = 50 pm). A maximum current density almost 20 times higher than that associated with direct current (DC) operation was observed by driving an OLED with a short pulse voltage. With short-pulse excitation, the decrease in external quantum efficiency. (eta(ext)) obeyed a typical singlet-singlet exciton annihilation model well, indicating that the generation of Joule heat in OLEDs can be suppressed under pulse operation.

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页码：3659 / 3662

页数：4

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