Charge carrier transport in an emissive layer of green electrophosphorescent devices

被引：69

作者：

Matsusue, N ^{[1
]}

Ikame, S ^{[1
]}

Suzuki, Y ^{[1
]}

Naito, H ^{[1
]}

机构：

[1] Osaka Prefecture Univ, Dept Phys & Elect, Osaka 5998531, Japan

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 18期

关键词：

D O I：

10.1063/1.1813628

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Charge carrier generation and transport in fac tris (2-phenylpyridine) iridium (III) (Ir(ppy)(3)) doped in 4,4(')-N,N-'-dicarbazole-biphenel (CBP) thin films have been studied in terms of time-of-flight and time-resolved photoluminescence spectroscopies. It is found that the excitation energy rapidly transfer from CBP to Ir(ppy)(3), and that the charge carriers are generated on Ir(ppy)(3) sites. With increasing Ir(ppy)(3) concentration, the electron drift mobility is slightly decreased, while the hole transit signals become unobservable. The electron and hole transport properties of Ir(ppy)(3) doped CBP thin films result from the energy levels of the lowest unoccupied molecular orbital and the highest occupied molecular orbital of Ir(ppy)(3) with respect to those of CBP. (C) 2004 American Institute of Physics.

引用

页码：4046 / 4048

页数：3

共 13 条

[1] Nearly 100% internal phosphorescence efficiency in an organic light-emitting device [J].

Adachi, C ;

Baldo, MA ;

Thompson, ME ;

Forrest, SR .

JOURNAL OF APPLIED PHYSICS, 2001, 90 (10) :5048-5051

[2] High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine)iridium doped into electron-transporting materials [J].

Adachi, C ;

Baldo, MA ;

Forrest, SR ;

Thompson, ME .

APPLIED PHYSICS LETTERS, 2000, 77 (06) :904-906

[3]

BALDO M, 2001, THESIS PRINCETON U

[4] Very high-efficiency green organic light-emitting devices based on electrophosphorescence [J].

Baldo, MA ;

Lamansky, S ;

Burrows, PE ;

Thompson, ME ;

Forrest, SR .

APPLIED PHYSICS LETTERS, 1999, 75 (01) :4-6

[5] Transient analysis of organic electrophosphorescence: I. Transient analysis of triplet energy transfer [J].

Baldo, MA ;

Forrest, SR .

PHYSICAL REVIEW B, 2000, 62 (16) :10958-10966

[6] Dispersive electron transport in an electroluminescent polyfluorene copolymer measured by the current integration time-of-flight method [J].

Campbell, AJ ;

Bradley, DDC ;

Antoniadis, H .

APPLIED PHYSICS LETTERS, 2001, 79 (14) :2133-2135

[7] Effect of dipoles on carrier drift and diffusion of molecularly doped polymers [J].

Hirao, A ;

Nishizawa, H .

PHYSICAL REVIEW B, 1997, 56 (06) :R2904-R2907

[8] Highly efficient phosphorescence from organic light-emitting devices with an exciton-block layer [J].

Ikai, M ;

Tokito, S ;

Sakamoto, Y ;

Suzuki, T ;

Taga, Y .

APPLIED PHYSICS LETTERS, 2001, 79 (02) :156-158

[9] Quenching effects in organic electrophosphorescence [J].

Kalinowski, J ;

Stampor, W ;

Mezyk, J ;

Cocchi, M ;

Virgili, D ;

Fattori, V ;

Di Marco, P .

PHYSICAL REVIEW B, 2002, 66 (23) :1-15

[10] Nondispersive electron transport in Alq3 [J].

Malliaras, GG ;

Shen, YL ;

Dunlap, DH ;

Murata, H ;

Kafafi, ZH .

APPLIED PHYSICS LETTERS, 2001, 79 (16) :2582-2584

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