Balanced ambipolar charge carrier mobility in mixed layers for application in hybrid white organic light-emitting diodes

被引：69

作者：

Schwartz, Gregor ^{[1
]}

Ke, Tung-Huei ^{[1
]}

Wu, Chung-Chih ^{[1
]}

Walzer, Karsten ^{[1
]}

Leoc, Karl ^{[1
]}

机构：

[1] Tech Univ Dresden, Inst Angew Photophys, D-01069 Dresden, Germany

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 07期

关键词：

D O I：

10.1063/1.2973151

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate the electron and hole mobility in mixed layers of N, N '-di(naphthalen-1-yl)-N, N '-diphenyl-benzidine and bis(2-methyl-8-quinolinato)-4-phenylphenolate aluminum with different mix ratios, using both space-charge limited currents of single-carrier devices with electrically doped charge transport layers and time-of-flight measurements. Both experimental methods yield consistent results. The 1:1 blend shows balanced ambipolar charge carrier transport, which is advantageous for the application as exciton blocking interlayer in hybrid white organic light-emitting diodes: The electroluminescence spectrum is rather stable against changes in interlayer thickness and driving current. Moreover, the external quantum efficiency is enhanced by a factor of 2.5 as compared to a device without interlayer. (c) 2008 American Institute of Physics.

引用

页数：3

共 15 条

[1] CHARGE TRANSPORT IN DISORDERED ORGANIC PHOTOCONDUCTORS - A MONTE-CARLO SIMULATION STUDY [J].

BASSLER, H .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1993, 175 (01) :15-56

[2] Low voltage organic light emitting diodes featuring doped phthalocyanine as hole transport material [J].

Blochwitz, J ;

Pfeiffer, M ;

Fritz, T ;

Leo, K .

APPLIED PHYSICS LETTERS, 1998, 73 (06) :729-731

[3] Thickness scaling of the space-charge-limited current in poly(p-phenylene vinylene) -: art. no. 092105 [J].

Blom, PWM ;

Tanase, C ;

de Leeuw, DM ;

Coehoorn, R .

APPLIED PHYSICS LETTERS, 2005, 86 (09) :1-3

[4] White organic light-emitting devices with a bipolar transport layer between blue fluorescent and orange phosphorescent emitting layers [J].

Chen, Ping ;

Xie, Wenfa ;

Li, Jiang ;

Guan, Tao ;

Duan, Yu ;

Zhao, Yi ;

Liu, Shiyong ;

Ma, Chunsheng ;

Zhang, Liying ;

Li, Bin .

APPLIED PHYSICS LETTERS, 2007, 91 (02)

[5] Hole mobility of N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl) benzidine investigated by using space-charge-limited currents [J].

Chu, Ta-Ya ;

Song, Ok-Keun .

APPLIED PHYSICS LETTERS, 2007, 90 (20)

[6] Employing ambipolar oligofluorene as the charge-generation layer in time-of-flight mobility measurements of organic thin films [J].

Hung, WY ;

Ke, TH ;

Lin, YT ;

Wu, CC ;

Hung, TH ;

Chao, TC ;

Wong, KT ;

Wu, CI .

APPLIED PHYSICS LETTERS, 2006, 88 (06)

[7]

HUNZE A, 2007, P SPIE, V6555

[8] Charge carrier mobility of mixed-layer organic light-emitting diodes [J].

Liu, Shun-Wei ;

Lee, Jiun-Haw ;

Lee, Chih-Chien ;

Chen, Chin-Ti ;

Wanga, Juen-Kai .

APPLIED PHYSICS LETTERS, 2007, 91 (14)

[9] THEORY OF SPACE-CHARGE-LIMITED CURRENT ENHANCED BY FRENKEL EFFECT [J].

MURGATROYD, PN .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1970, 3 (02) :151-+

[10] Ambipolar charge carrier transport in mixed organic layers of phthalocyanine and fullerene [J].

Opitz, Andreas ;

Bronner, Markus ;

Bruetting, Wolfgang .

JOURNAL OF APPLIED PHYSICS, 2007, 101 (06)

← 1 2 →