Ambipolar conductive 2,7-carbazole derivatives for electroluminescent devices

Jiun Yi Shen, Xiang Lin Yang, Tai Hsiang Huang, Jiann T. Lin, Tung Huei Ke, Li Yin Chen, Chung Chih Wu, Ming-Chang P. Yeh

Research output: Contribution to journalArticle

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Abstract

A series of 2,7-disubstituted carbazole (2,7-carb) derivatives incorporating arylamines at the 2 and 7 positions are synthesized via palladium-catalyzed C-N or C-C bond formation. These compounds possess glass transition temperatures ranging from 87 to 217 °C and exhibit good thermal stabilities, with thermal decomposition temperatures ranging from 388 to 480 °C. They are fluorescent and emit in the purple-blue to orange region. Two types of organic light emitting diodes (OLEDs) were constructed from these compounds: (I) indium tin oxide (ITO)/2,7-carb (40 nm)/1,3,5-tris(N- phenylbenzimidazol-2-yl)benzene (TPBI, 40 nm)/Mg:Ag; and (II) ITO/2,7-carb (40 nm)/tris(8-hydroxyquinoline) aluminum (Alq3,40 nm)/Mg:Ag. In type I devices, the 2,7-disubstituted carbazoles function as both hole-transporting and emitting material. In type II devices, light is emitted from either the 2,7-disubstituted carbazole layer or Alq3. The devices appear to have a better performance compared to devices fabricated with their 3,6-disubstituted carbazole congeners. Some of the new compounds exhibit ambipolar conductive behavior, with hole and electron mobilities up to 10 -4 cm2 V-1 s-1.

Original languageEnglish
Pages (from-to)983-995
Number of pages13
JournalAdvanced Functional Materials
Volume17
Issue number6
DOIs
Publication statusPublished - 2007 Apr 16

Fingerprint

Luminescent devices
carbazoles
Tin oxides
Indium
Derivatives
Hole mobility
Electron mobility
Organic light emitting diodes (OLED)
Palladium
Benzene
Pyrolysis
Thermodynamic stability
Aluminum
Carbazoles
indium oxides
tin oxides
congeners
hole mobility
electron mobility
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Ambipolar conductive 2,7-carbazole derivatives for electroluminescent devices. / Shen, Jiun Yi; Yang, Xiang Lin; Huang, Tai Hsiang; Lin, Jiann T.; Ke, Tung Huei; Chen, Li Yin; Wu, Chung Chih; Yeh, Ming-Chang P.

In: Advanced Functional Materials, Vol. 17, No. 6, 16.04.2007, p. 983-995.

Research output: Contribution to journalArticle

Shen, JY, Yang, XL, Huang, TH, Lin, JT, Ke, TH, Chen, LY, Wu, CC & Yeh, M-CP 2007, 'Ambipolar conductive 2,7-carbazole derivatives for electroluminescent devices', Advanced Functional Materials, vol. 17, no. 6, pp. 983-995. https://doi.org/10.1002/adfm.200600921
Shen, Jiun Yi ; Yang, Xiang Lin ; Huang, Tai Hsiang ; Lin, Jiann T. ; Ke, Tung Huei ; Chen, Li Yin ; Wu, Chung Chih ; Yeh, Ming-Chang P. / Ambipolar conductive 2,7-carbazole derivatives for electroluminescent devices. In: Advanced Functional Materials. 2007 ; Vol. 17, No. 6. pp. 983-995.
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