EL Behavior for Blue-Emitting Aluminum Quinoline-Based Organic Light-Emitting Diodes

被引：7
|
作者：
Mori, Tatsuo [1 ]
Itoh, Takaaki [1 ]
机构：
[1] Nagoya Univ, Grad Sch Engn, Dept Elect Engn & Comp Sci, Chikusa Ku, Aichi 4648603, Japan
来源：
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY | 2009年 / 22卷 / 04期
关键词：
OLED; EL spectra; recombination zone; electron injection; THIN-FILMS; ELECTROLUMINESCENCE; DEVICES; EFFICIENCY; MECHANISM;
D O I：
10.2494/photopolymer.22.515
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We fabrucated bilayer organic light-emitting diodes (PLEDs) consisting of a diamine derivative (alpha-NPD) and aluminum(III) bis(2-methyl-8-quinolinate)4-phenylphenolate (BAlq) and investigated their EL properties depending on BAlq's thickness and a kind of cathode metal. Since the OLEDs showed EL spectra including both alpha-NPD and BAlq3 emissions, we discussed the recombunation mechanism of OLEDs from the ratio of alpha-NPD and BAlq3 emissions. The alpha-NPD/BAlq3 OLEDs have two recombination zones in alpha-NPD and BAlq layer, so that electrons are injected into alpha-NPD layer. To our surprise, when Al with a poor electron injection is used as the cathode, alpha-NPD content was found to increase as compared with the use of LiF/Al in spite of decreasing electron current. Electron injection into alpha-NPD was thought to be one of degradation factors.
引用
收藏
页码：515 / 520
页数：6
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