Highly efficient phosphorescent organic light-emitting diodes using alkyl-substituted iridium complexes as a solution-processible host material

被引：9

作者：

Tsuzuki, Toshimitsu ^{[1
]}

Tokito, Shizuo ^{[1
]}

机构：

[1] NHK Japan Broadcasting Corp, Sci & Tech Res Labs, Setagaya Ku, Tokyo 1578510, Japan

来源：

APPLIED PHYSICS EXPRESS | 2008年 / 1卷 / 02期

关键词：

D O I：

10.1143/APEX.1.021805

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We fabricated highly efficient organic light-emitting diodes (OLEDs) using the solution processible iridium complexes which have long alkyl or cycloalkyl substituents in an ancillary ligand as a host material and a red phosphorescent iridium complex as an emitting guest by spin coating method. The OLEDs emitted red phosphorescence from the guest and the luminance reached around 10,000 cd/m(2). The efficiency of the OLED improved after we added an electron transport material (ETM) to the emitting layer, The OLED using a mixture of the alkyl substituted iridium complex and ETM as the host showed an external quantum efficiency of 10%. (c) 2008 The Japan Society of Applied Physics.

引用

页数：3

共 15 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] 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

[4] 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

[5] Efficient low-molecule phosphorescent organic light-emitting diodes fabricated by wet-processing [J].

Hino, Y ;

Kajii, H ;

Ohmori, Y .

ORGANIC ELECTRONICS, 2004, 5 (05) :265-270

[6] 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

[7] White organic light-emitting devices with a solution-processed and molecular host-employed emission layer [J].

Jou, JH ;

Sun, MC ;

Chou, HH ;

Li, CH .

APPLIED PHYSICS LETTERS, 2005, 87 (04)

[8] Highly phosphorescent bis-cyclometalated iridium complexes: Synthesis, photophysical characterization, and use in organic light emitting diodes [J].

Lamansky, S ;

Djurovich, P ;

Murphy, D ;

Abdel-Razzaq, F ;

Lee, HE ;

Adachi, C ;

Burrows, PE ;

Forrest, SR ;

Thompson, ME .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (18) :4304-4312

[9] Improved energy transfer in electrophosphorescent devices [J].

O'Brien, DF ;

Baldo, MA ;

Thompson, ME ;

Forrest, SR .

APPLIED PHYSICS LETTERS, 1999, 74 (03) :442-444

[10] Durability test of solution-processed organic electrophosphorescent devices with small organic molecules [J].

Ooe, M ;

Naka, S ;

Okada, H ;

Onnagawa, H .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 2006, 45 (1A) :250-254

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