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

研究成果: 雜誌貢獻文章同行評審

97 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)983-995
頁數13
期刊Advanced Functional Materials
17
發行號6
DOIs
出版狀態已發佈 - 2007 四月 16

ASJC Scopus subject areas

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

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