Journal
THIN SOLID FILMS
Volume 517, Issue 2, Pages 943-947Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2008.07.005
Keywords
Organic electroluminescent devices; Phosphorescence; Host material; Carbazole
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Funding
- Chunghwa Picture Tubes, Ltd. (CPT)
- National Science Council of Taiwan
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A carbazole-based host material, 4,4'-N,N'-[di(3, 6-di(t-butyl)carbazole]biphenyl (ttbCBP), with four t-butyl steric spacers on peripheral carbazole moieties was effectively synthesized through Friedel-Crafts Alkylation. Owing to the presence of sterically hindered t-butyl groups, ttbCBP exhibits a high glass transition temperature (175 degrees C) and is morphologically stable. This host material also preserves the characteristics of wide band-gap of 3.2 eV and high triplet energy of 2.64 eV. In addition, ttbCBP has been shown to be effective hosts for green and red phosphorescent emitters in organic electrophosphorescent devices. (C) 2008 Elsevier B.V. All rights reserved.
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