Electro-active oligomers containing pendent carbazolyl or indolyl groups as host materials for OLEDs
✍ Scribed by R. Zostautiene; D. Mazetyte; J. V. Grazulevicius; Y. M. Lai; W. B. Wang; J. H. Jou; S. Grigalevicius
- Book ID
- 101597268
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 204 KB
- Volume
- 122
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Abstract
Oligoethers containing electroactive carbazolyl, indolyl or 2‐phenylindolyl fragments were synthesized and characterized by NMR spectroscopy, elemental analysis and gel permeation chromatography. The oligomers represent amorphous materials of high thermal stability with glass transition temperatures of 107–161°C. The electron photoemission spectra of layers of the synthesized oligomers showed ionization potentials of 5.9–5.95 eV. Some of the derivatives were tested as host materials in phosphorescent OLEDs with iridium(III) [bis(4,6‐difluorophenyl)‐pyridinato‐N,C2′]picolinate as the guest. The device based on oligomer containing carbazolyl fragments exhibited the best overall performance with a turn‐on voltage of 3.5 V, maximum power efficiency of 4.1 lm/W and maximum brightness of 937 cd/m^2^. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011