Journal
DYES AND PIGMENTS
Volume 134, Issue -, Pages 348-357Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.06.003
Keywords
Triphenylamine; 4,5-Diazafluorene; Oligomer; Phosphorescent organic light-emitting diodes; Host; Solution-processable
Funding
- National Natural Science Foundation of China [21174061, 61106017, 61136003]
- Natural Science Foundation of Jiangsu Province [BM2012010, BK20131375]
- Synergetic Innovation Center for Organic Electronics and Information Displays, Nanjing University Testing Fund [0205001441]
- Program for Changjiang Scholars and Innovative Research Team in University of China [IRT1148]
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A bipolar macrospirocyclic trimer based on 4,5-diazafluorene and triphenylamine was prepared as a host for solution-processed blue phosphorescent organic light emitting diodes. The oligomer exhibits a high triplet energy of 2.88 eV, excellent thermal and morphological stability, good film-forming ability and solution processability. A solution-processed phosphorescent device based on Flrpic and the trimer achieved a maximum current efficiency of 10.0 cd A(-1) with a low current efficiency roll-off at the practical luminance (9.6, 10;0, 9.4 cd A(-1) at 102, 207, 1096 cd m(-2), respectively). The oligomer additionally showed excellent chemical compatibility with the common host for solution-processing technology. A blue phosphorescent device using mixed hosts of the trimer/4,4'-cyclohexylidenebis(N,N-bis(4-methyl -phenyl)benzenamine) achieved a low turn-on voltage of 3.0 V, a maximum luminance of 28,368 cd m(-2), and a maximum current efficiency of 17.7 cd A(-1) (11.9 lm W-1), which is almost three times that of a single 4,4'-cyclohexylidenebis(N,N- bis(4-methylphenyl)benzenamine)-hosted device. (C) 2016 Published by Elsevier Ltd.
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