Carbazole-based polymers as hosts for solution-processed organic light-emitting diodes: Simplicity, efficacy

Highly efficient red phosphorescent organic light-emitting diodes based on solution processed emissive layer

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.

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

Poly(2-(N-carbazolyl)ethyl acrylate) as a host for high efficiency polymer light-emitting devices

Color optimization of conjugated-polymer/InGaN hybrid white light emitting diodes by incomplete energy transfer

Efficient green-phosphorescent light-emitting diodes based on polymeric binary-host systems

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Efficient green-phosphorescent light-emitting diodes based on polymeric binary-host systems