Improved Device Lifetime of Organic Light Emitting Diodes with an Electrochemically Stable π-Conjugated Liquid Host in the Liquid Emitting Layer

被引：29

作者：

Hirata, Shuzo ^{[1
]}

Heo, Hyo Jung ^{[1
]}

Shibano, Yuki ^{[2
]}

Hirata, Osamu ^{[2
]}

Yahiro, Masayuki ^{[1
,3
]}

Adachi, Chihaya ^{[1
]}

机构：

[1] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Fukuoka 8190395, Japan

[2] Nissan Chem Ind Co Ltd, Funabashi, Chiba 2748507, Japan

[3] Inst Syst Informat Technol & Nanotechnol ISIT, Fukuoka 8140001, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2012年 / 51卷 / 04期

关键词：

CELLS; CHEMILUMINESCENCE; LUMINESCENCE; MOLECULES;

D O I：

10.1143/JJAP.51.041604

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The device lifetimes of organic light emitting diodes with a liquid emitting layer (liquid OLEDs) were improved by proper combination of host and guest molecules in the liquid emitting layer. The device lifetime strongly depends on the electrochemical stability of radical cations in the liquid emitting layer. The electrochemical stability of the liquid host materials was achieved by the dimerization of the alkyl-substituted carbazole 9,9'-{2[2-(2-methoxyethoxy)ethoxy]ethyl}-3,3'-bis(9H-carbazole) [(TEGCz)(2)]. The use of a guest compound with its highest occupied molecular orbital level higher in energy than that of (TEGCz)(2) is a critical factor for realizing stable electroluminescence performance. A liquid OLED with proper combination of the guest and host materials showed an improved device lifetime of longer than 1 h, which is 100 times longer than that of our previous reports. (C) 2012 The Japan Society of Applied Physics

引用

页数：9

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