Solution-processable highly efficient yellow- and red-emitting phosphorescent organic light emitting devices from a small molecule bipolar host and iridium complexes

被引：73

作者：

Tao, Youtian ^{[1
]}

Wang, Qiang ^{[2
,3
]}

Yang, Chuluo ^{[1
]}

Zhang, Kai ^{[1
]}

Wang, Qi ^{[2
,3
]}

Zou, Taotao ^{[1
]}

Qin, Jingui ^{[1
]}

Ma, Dongge ^{[2
]}

机构：

[1] Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China

[2] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China

[3] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2008年 / 18卷 / 34期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1039/b806306k

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：

A bipolar transport compound, 2,5-bis(4-(9-(2-ethylhexyl)-9H-carbazol-3-yl) phenyl)-1,3,4-oxadiazole (CzOXD), incorporating both electron-and hole-transport functionalities, was synthesized and fully characterized by H-1 NMR, C-13 NMR, elemental analysis and mass spectrometry. Its thermal, electrochemical, electronic absorption and photoluminescent properties were studied. The atomic force microscopy images indicate that smooth and homogeneous films can be obtained by spin-coating from a chloroform solution of CzOXD/iridium complex blends. Highly efficient small-molecule-based organic light emitting devices were fabricated by a wet process. With the device structure of ITO/PEDOT:PSS/Ir complex : CzOXD/BCP/Alq(3)/LiF/Al, a maximum luminance of 15232 cd m(-2) and current efficiency of 20 cd A(-1) for a yellow-emitting OLED, and 4896 cd m(-2), 4.6 cd A(-1) for a red-emitting OLED were achieved under ambient conditions.

引用

页码：4091 / 4096

页数：6

共 55 条

[1] 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

[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] Tris-cyclometalated iridium(III) complexes of carbazole(fluorenyl)pyridine ligands: Synthesis, redox and photophysical properties, and electrophosphoreseent light-emitting diodes [J].

Bettington, Sylvia ;

Tavasli, Mustafa ;

Bryce, Martin R. ;

Beeby, Andrew ;

Al-Attar, Hameed ;

Monkman, Andrew P. .

CHEMISTRY-A EUROPEAN JOURNAL, 2007, 13 (05) :1423-1431

[5] Carbazole compounds as host materials for triplet emitters in organic light-emitting diodes:: Tuning the HOMO level without influencing the triplet energy in small molecules [J].

Brunner, K ;

van Dijken, A ;

Börner, H ;

Bastiaansen, JJAM ;

Kiggen, NMM ;

Langeveld, BMW .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (19) :6035-6042

[6] Highly efficient blue electrophosphorescent devices with a new series of host materials: polyphenylene-dendronized oxadiazole derivatives [J].

Chen, Shiyan ;

Xu, Xinjun ;

Liu, Yunqi ;

Qiu, Wenfeng ;

Yu, Gui ;

Sun, Xiaobo ;

Zhang, Hengjun ;

Qi, Ting ;

Lu, Kun ;

Gao, Xike ;

Liu, Ying ;

Zhu, Daoben .

JOURNAL OF MATERIALS CHEMISTRY, 2007, 17 (36) :3788-3795

[7] Triplet energy back transfer in conjugated polymers with pendant phosphorescent iridium complexes [J].

Evans, Nicholas R. ;

Devi, Lekshmi Sudha ;

Mak, Chris S. K. ;

Watkins, Scott E. ;

Pascu, Sofia I. ;

Koehler, Anna ;

Friend, Richard H. ;

Williams, Charlotte K. ;

Holmes, Andrew B. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (20) :6647-6656

[8] The synthesis and properties of solution processable red-emitting phosphorescent dendrimers [J].

Frampton, MJ ;

Namdas, EB ;

Lo, SC ;

Burn, PL ;

Samuel, IDW .

JOURNAL OF MATERIALS CHEMISTRY, 2004, 14 (19) :2881-2888

[9] High efficiency and small roll-off electrophosphorescence from a new iridium complex with well-matched energy levels [J].

Gao, Zhi Qiang ;

Mi, Bao Xiu ;

Tam, Hoi Lam ;

Cheah, Kok Wai ;

Chen, Chin Hsin ;

Wong, Man Shing ;

Lee, Shuit Tong ;

Lee, Chun Sing .

ADVANCED MATERIALS, 2008, 20 (04) :774-+

[10] Solution-processible bipolar triphenylamine-benzimidazole derivatives for highly efficient single-layer organic light-emitting diodes [J].

Ge, Ziyi ;

Hayakawa, Teruaki ;

Ando, Shinji ;

Ueda, Mitsuru ;

Akiike, Toshiyuki ;

Miyamoto, Hidetoshi ;

Kajita, Toru ;

Kakimoto, Masa-Aki .

CHEMISTRY OF MATERIALS, 2008, 20 (07) :2532-2537

← 1 2 3 4 5 6 →