Issue 40, 2015

New bipolar host materials for high performance of phosphorescent green organic light-emitting diodes

Abstract

We report a series of four bipolar host materials with indenocarbozole and biphenyl pyrimidine moieties for efficient phosphorescent green organic light-emitting diodes (OLEDs). All four host materials possess excellent electro-optical properties as well as good thermal and morphological stability due to their high glass transition temperature of 129 °C and decomposition temperature of 363–401 °C. The new materials also show good triplet energy of 2.76 eV and excellent charge carrier transport properties. The fabricated OLED device with 11-[3-(2,6-diphenyl-pyrimidin-4-yl)-phenyl]-12,12-dimethyl-11,12-dihydro-11-aza-indeno[2,1-a]fluorene (mDPPICz1) as green host shows maximum current and power efficiency as high as 75.8 cd A−1 and 87.1 lm W−1 at 1000 cd m−2, and an almost ideal external quantum efficiency of 21.7%.

Graphical abstract: New bipolar host materials for high performance of phosphorescent green organic light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
17 Mar 2015
Accepted
20 Mar 2015
First published
20 Mar 2015

RSC Adv., 2015,5, 31282-31291

Author version available

New bipolar host materials for high performance of phosphorescent green organic light-emitting diodes

G. H. Kim, R. Lampande, J. H. Kong, J. M. Lee, J. H. Kwon, J. K. Lee and J. H. Park, RSC Adv., 2015, 5, 31282 DOI: 10.1039/C5RA04593B

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