Highly efficient polymer light-emitting devices using ambipolar phosphorescent polymers

被引：116

作者：

Suzuki, M

Tokito, S

Sato, F

Igarashi, T

Kondo, K

Koyama, T

Yamaguchi, T

机构：

[1] NHK Japan Broadcasting Corp, Setagaya Ku, Tokyo 1578510, Japan

[2] Showa Denko Co Ltd, Corp R&D Ctr, Midori Ku, Chiba 2670056, Japan

来源：

APPLIED PHYSICS LETTERS | 2005年 / 86卷 / 10期

关键词：

D O I：

10.1063/1.1879102

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We. report on highly efficient polymer light-emitting devices (PLEDs) achieved using a phosphorescent polymer, which is a copolymer that has bis(2-phenylpyridine)iridium (acetylacetonate) [Ir(ppy)(2)(acac)], N,N'-diphenyl-NN'-bis(3-methylphenyl)-[1,1'-biphenyl]-4,4' -diamine (TPD) and 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as a side group. The phosphorescent polymer has an ambipolar charge-transport ability. An increase in PBD unit concentration allows an improvement in the efficiency of the PLEDs. Ba and Cs were used for electron-injection layers as well as Ca, to improve the electron injection. An external quantum efficiency of 11.8% and a power efficiency of 38.6 lm/W were obtained by using Cs. The results indicate that this can be attributed to an improvement in the charge balance of electrons and holes. (c) 2005 American Institute of Physics.

引用

收藏

页码：1 / 3

页数：3

相关论文

共 17 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] 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

[3] Impact of the metal cathode and CsF buffer layer on the performance of organic light-emitting devices [J].

Chan, MY ;

Lai, SL ;

Fung, MK ;

Lee, CS ;

Lee, ST .

JOURNAL OF APPLIED PHYSICS, 2004, 95 (10) :5397-5402

[4] High-performance polymer light-emitting diodes doped with a red phosphorescent iridium complex [J].

Chen, FC ;

Yang, Y ;

Thompson, ME ;

Kido, J .

APPLIED PHYSICS LETTERS, 2002, 80 (13) :2308-2310

[5] Red electrophosphorescence from polymer doped with iridium complex [J].

Gong, X ;

Ostrowski, JC ;

Bazan, GC ;

Moses, D ;

Heeger, AJ .

APPLIED PHYSICS LETTERS, 2002, 81 (20) :3711-3713

[6] Efficient, deep-blue organic electrophosphorescence by guest charge trapping [J].

Holmes, RJ ;

D'Andrade, BW ;

Forrest, SR ;

Ren, X ;

Li, J ;

Thompson, ME .

APPLIED PHYSICS LETTERS, 2003, 83 (18) :3818-3820

[7] 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

[8] Energy transfer in polymer electrophosphorescent light emitting devices with single and multiple doped luminescent layers [J].

Kawamura, Y ;

Yanagida, S ;

Forrest, SR .

JOURNAL OF APPLIED PHYSICS, 2002, 92 (01) :87-93

[9] Cyclometalated Ir complexes in polymer organic light-emitting devices [J].

Lamansky, S ;

Djurovich, PI ;

Abdel-Razzaq, F ;

Garon, S ;

Murphy, DL ;

Thompson, ME .

JOURNAL OF APPLIED PHYSICS, 2002, 92 (03) :1570-1575

[10] Polymer phosphorescent light-emitting devices doped with tris(2-phenylpyridine) iridium as a triplet emitter [J].

Lee, CL ;

Lee, KB ;

Kim, JJ .

APPLIED PHYSICS LETTERS, 2000, 77 (15) :2280-2282