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Issue 48, 2013
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Carbazole based polymers as hosts for blue iridium emitters: synthesis, photophysics and high efficiency PLEDs

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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.

Graphical abstract: Carbazole based polymers as hosts for blue iridium emitters: synthesis, photophysics and high efficiency PLEDs

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Publication details

The article was received on 24 Jul 2013, accepted on 23 Oct 2013, published on 23 Oct 2013 and first published online on 23 Oct 2013


Article type: Paper
DOI: 10.1039/C3TC31441C
Citation: J. Mater. Chem. C, 2013,1, 8209-8221
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    Carbazole based polymers as hosts for blue iridium emitters: synthesis, photophysics and high efficiency PLEDs

    E. Stanislovaityte, J. Simokaitiene, S. Raisys, H. Al-Attar, J. V. Grazulevicius, A. P. Monkman and V. Jankus, J. Mater. Chem. C, 2013, 1, 8209
    DOI: 10.1039/C3TC31441C

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