The influence of exciton behavior on luminescent characteristics of organic light-emitting diodes

被引：4
作者：
Zhao, D. W. [1 ]
Zhang, F. J.
Song, S. F.
Xu, C.
Xu, Z.
机构：
[1] Jiao Tong Univ, Inst Optoelect Technol, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China
[2] Liaoning Univ, Coll Phys, Shenyang 110036, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2007年 / 253卷 / 18期
基金：
中国国家自然科学基金;
关键词：
photoluminescence (PL); electroluminescence (EL); polarization; dissociation; exciton; CONJUGATED POLYMERS; PHOTOLUMINESCENCE; DISSOCIATION;
D O I：
10.1016/j.apsusc.2007.03.044
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：
We used N,N'-bis-(1-naphthyl)-N,N'-1-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB), 4,4'-N,N'-dicarbazole-biphenyl (CBP) and tris(8-hydroxyquinoline) aluminum (Alq(3)) to fabricate tri-layer electroluminescent (EL) device (device structure: ITO/NPB/CBP/Alq(3)/Al). In photoluminescence (PL) spectra of this device, the emission from NPB shifted to shorter wavelength accompanying with the decrease of its emission intensity and moreover the emission intensity of Alq(3) increased relatively with the increase of reverse bias voltage. The blue-shifted emission and the decrease in emission intensity of NPB were attributed to the polarization and dissociation of NPB excitons under reverse bias voltage. The increase of emission intensity of Alq(3) benefited from the recombination of electrons (produced by the dissociation of NPB exciton) and holes (injected from the Al cathode). (c) 2007 Published by Elsevier B.V.
引用
收藏
页码：7412 / 7415
页数：4
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