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Electro‐active oligomers containing pendent carbazolyl or indolyl groups as host materials for OLEDs
Author(s) -
Zostautiene R.,
Mazetyte D.,
Grazulevicius J. V.,
Lai Y. M.,
Wang W. B.,
Jou J. H.,
Grigalevicius S.
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.34206
Subject(s) - oligomer , phosphorescence , glass transition , thermal stability , polymer chemistry , gel permeation chromatography , materials science , ionization energy , amorphous solid , oled , iridium , photochemistry , chemistry , ionization , organic chemistry , polymer , fluorescence , nanotechnology , ion , physics , layer (electronics) , quantum mechanics , composite material , catalysis
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