Charge-carrier injection characteristics at organic/organic heterojunction interfaces in organic light-emitting diodes

被引：37
|
作者：
Matsushima, Toshinori
Goushi, Kenichi
Adachi, Chihaya
机构：
[1] Kyushu Univ, Ctr Future Chem, Nishi Ku, Fukuoka 8190395, Japan
[2] Japan Sci & Technol Agcy, JST, Core Res Evolut Sci & Technol Program, CREST, Tokyo 1500011, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2007年 / 435卷 / 4-6期
关键词：
D O I：
10.1016/j.cplett.2007.01.010
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Organic light-emitting diodes (OLEDs) having various guest molecules doped in an organic host matrix layer are fabricated [the OLED structure is anode/hole-transporting layer (HTL)/guest-host emitting layer/hole-blocking layer/electron-transporting layer/cathode], and the dependence of current density-voltage (J-V) characteristics of the OLEDs on highest occupied molecular orbital (HOMO) levels of guest molecules are investigated. From the J-V characteristics of these OLEDs, we find two important results: (1) J-V characteristics of the OLEDs are controlled by the direct hole injection from the neighboring HTL to guest molecules, and (2) HOMO level alignment between the HTL and guest molecules provides efficient hole injection at this interface. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：327 / 330
页数：4
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