The effect of electric field strength on electroplex emission at the interface of NPB/PBD organic light-emitting diodes

被引：33

作者：

Zhao, De-Wei

Xu, Zheng ^{[1
]}

Zhang, Fu-Jun

Song, Shu-Fang

Zhao, Su-Ling

Wang, Yong

Yuan, Guang-Cai

Zhang, Yan-Fei

Xu, Hong-Hua

机构：

[1] Beijing Jiaotong Univ, Minist Educ Beijing, Key Lab Luminescence & Opt Informat, Inst Optoelect Technol, Beijing 100044, Peoples R China

[2] Liaoning Univ, Fac Phys, Shenyang 110036, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2007年 / 253卷 / 08期

基金：

中国国家自然科学基金;

关键词：

electroplex emission; exciton emission; red-shift;

D O I：

10.1016/j.apsusc.2006.08.046

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 diode (OLED) based on two kinds of blue emission materials N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-diphenyl-4,4'-diamine (NPB) and 2-(4-biphenylyl)-5(4-tert-butyl-phenyl)-1,3,4-oxadiazole (PBD) was fabricated. There is only one emission peak in photoluminescence (PL) spectrum which originates from NPB exciton emission. And the electroluminescence (EL) emission peaks have an apparent red-shift with the increase of driving voltage. The red-shift emission from exciplex emission could be ruled out. Thus, by the method of Gaussian fitting it should be ascribed to the overlap of exciton emission and electroplex emission which occurs at the interface between NPB and PBD. The formation of the electroplex emission under high electric field is analyzed. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：4025 / 4028

页数：4

共 18 条

[1] High-efficiency fluorescent organic light-emitting devices using a phosphorescent sensitizer [J].

Baldo, MA ;

Thompson, ME ;

Forrest, SR .

NATURE, 2000, 403 (6771) :750-753

[2] Highly efficient phosphorescent emission from organic electroluminescent devices [J].

Baldo, MA ;

O'Brien, DF ;

You, Y ;

Shoustikov, A ;

Sibley, S ;

Thompson, ME ;

Forrest, SR .

NATURE, 1998, 395 (6698) :151-154

[3] Bright, saturated, red-to-yellow organic light-emitting devices based on polarization-induced spectral shifts [J].

Bulovic, V ;

Shoustikov, A ;

Baldo, MA ;

Bose, E ;

Kozlov, VG ;

Thompson, ME ;

Forrest, SR .

CHEMICAL PHYSICS LETTERS, 1998, 287 (3-4) :455-460

[4]

BULOVIC V, 2001, ORGANIC ELECT MAT

[5]

Chao C., 1998, APPL PHYS LETT, V72, P636

[6]

Duan Y, 2004, CHINESE PHYS LETT, V21, P534, DOI 10.1088/0256-307X/21/3/033

[7] Multicomponent emission from organic light emitting diodes based on polymer dispersion of an aromatic diamine and an oxadiazole derivative [J].

Giro, G ;

Cocchi, M ;

Kalinowski, J ;

Di Marco, P ;

Fattori, V .

CHEMICAL PHYSICS LETTERS, 2000, 318 (1-3) :137-141

[8] Effect of carbazole-oxadiazole excited-state complexes on the efficiency of dye-doped light-emitting diodes [J].

Jiang, XZ ;

Killeen, KA ;

Thompson, ME ;

Pschenitzka, F ;

Hebner, TR ;

Sturm, JC .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (10) :6717-6724

[9] Unusual disparity in electroluminescence and photoluminescence spectra of vacuum-evaporated films of 1,1-bis ((di-4-tolylamino) phenyl) cyclohexane [J].

Kalinowski, J ;

Giro, G ;

Cocchi, M ;

Fattori, V ;

Di Marco, P .

APPLIED PHYSICS LETTERS, 2000, 76 (17) :2352-2354

[10] A model of electroluminescence in organic double-layer light-emitting diodes [J].

Khramtchenkov, DV ;

Bassler, H ;

Arkhipov, VI .

JOURNAL OF APPLIED PHYSICS, 1996, 79 (12) :9283-9290

← 1 2 →