Electron Injection Process in Light-Emitting Diodes Made from Polysilanes as Manifested by Incorporation of Electron Injection Layers
作者:
Hiroyuki Suzuki,
Satoshi Hoshino,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 315,
issue 1
页码: 199-204
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808044332
出版商: Taylor & Francis Group
关键词: organic LEDs;polysilanes;electron injection;oxadiazoles
数据来源: Taylor
摘要:
The electron injection process was investigated for poly(methylphenylsilane) (PMPS) in two-layer light-emitting diodes (TL-LEDs) composed of a PMPS film and a vacuum-deposited film of oxadiazole molecules (OXDs). The latter acts as an electron injection layer. The basic characteristics of the TL-LEDs were markedly better than those of single-layer LEDs. The magnitude of the accompanying red-shift in the EL spectrum coincides with the energy difference between the conduction band and/or the one-dimensional exciton level of PMPS, and the conduction band of an OXD layer. This study has revealed that electron injection in PMPS is an energy selective process occurring via surface defect levels which exist below the conduction band of the OXD layer in terms of energy, and that the electron-hole recombination takes place in the PMPS layer near the interface with the OXD layer.
点击下载:
PDF (274KB)
返 回