E. Stanislovaityte
Carbazole based polymers as hosts for blue iridium emitters: synthesis, photophysics and high efficiency PLEDs
Stanislovaityte, E.; Simokaitiene, J.; Raisys, S.; Al-Attar, H.; Grazulevicius, J.V.; Monkman, A.P.; Jankus, V.
Authors
J. Simokaitiene
S. Raisys
H. Al-Attar
J.V. Grazulevicius
Professor Andrew Monkman a.p.monkman@durham.ac.uk
Professor
V. Jankus
Abstract
This article reports the synthesis of new carbazole based polymers and their application as hosts in sky-blue polymer light emitting devices (PLEDs) with a solution-processed emitting layer doped with a cyclometalated Ir(III) complex. We systematically investigate their effect on the PLED performance. A current efficiency of 19.7 cd A(-1) and a brightness of 1850 cd m(-2) were achieved with these polymers. The roll-off in electrophosphorescent quantum efficiency in PLEDs was shown to arise mainly from triplet-triplet annihilation between dopants in the hosts with tert-butyl groups. It has been shown that in the devices with hosts without tert-butyl groups the efficiency roll-off is additionally affected by electric field quenching. In these carbazole based polymers, triplet dimers are formed and tert-butyl groups do not limit the intermolecular interactions to prevent triplet dimer formation, nevertheless tert-butyl groups reduce charge transport.
Citation
Stanislovaityte, E., Simokaitiene, J., Raisys, S., Al-Attar, H., Grazulevicius, J., Monkman, A., & Jankus, V. (2013). Carbazole based polymers as hosts for blue iridium emitters: synthesis, photophysics and high efficiency PLEDs. Journal of Materials Chemistry C Materials for optical and electronic devices, 1(48), 8209-8221
Journal Article Type | Article |
---|---|
Publication Date | 2013 |
Deposit Date | Jan 18, 2017 |
Journal | Journal of Materials Chemistry C Materials for optical and electronic devices |
Print ISSN | 2050-7526 |
Electronic ISSN | 2050-7534 |
Publisher | Royal Society of Chemistry |
Volume | 1 |
Issue | 48 |
Pages | 8209-8221 |
Public URL | https://durham-repository.worktribe.com/output/1366174 |
Publisher URL | <Go to ISI>://WOS:000327546300030 |
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