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Issue 33, 2013

Small single–triplet energy gap bipolar host materials for phosphorescent blue and white organic light emitting diodes

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Abstract

We report extremely high efficiency tandem white organic light-emitting diodes (OLEDs) with newly synthesized host materials. Our new host materials have well balanced bipolar characteristics and very small singlet to triplet splitting energies (∼0.4 eV) due to almost no orbital overlapping between ground and excited states. The fabricated blue phosphorescent device with one of these host materials shows very high external quantum efficiency of 25.7%, low onset and driving voltages of 2.47 V and 3.49 V at 1 and 1000 cd m−2, respectively. High performance asymmetric tandem OLEDs could be fabricated by adopting these efficient and low driving voltage blue unit and very efficient yellow unit devices. Power efficiency of 63.1 lm W−1 and current efficiency of 128.8 cd A−1 at 1000 cd m−2 were achieved without any light out-coupling technology. We expect that blue phosphorescent OLEDs with our new narrow band-gap bipolar host materials could be a promising solution to make high efficiency white OLEDs for display and lighting applications.

Graphical abstract: Small single–triplet energy gap bipolar host materials for phosphorescent blue and white organic light emitting diodes

Article information


Submitted
11 Apr 2013
Accepted
25 Jun 2013
First published
22 Jul 2013

J. Mater. Chem. C, 2013,1, 5008-5014
Article type
Paper

Small single–triplet energy gap bipolar host materials for phosphorescent blue and white organic light emitting diodes

Y. H. Son, Y. J. Kim, M. J. Park, H. Oh, J. S. Park, J. H. Yang, M. C. Suh and J. H. Kwon, J. Mater. Chem. C, 2013, 1, 5008 DOI: 10.1039/C3TC30671B

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