Issue 17, 2016

Molecular design of host materials for high power efficiency in blue phosphorescent organic light-emitting diodes doped with an imidazole ligand based triplet emitter

Abstract

A molecular design strategy to facilitate electron injection and to reduce driving voltage was proposed to reach high power efficiency in blue phosphorescent organic light-emitting diodes (PHOLEDs) doped with a phenylimidazole ligand based triplet emitter. The host materials were designed to keep the hole transport properties and triplet energy of a parent molecule. One or two CN units were attached to 3- or 3,6-positions of carbazole of 3,3-di(9H-carbazol-9-yl)biphenyl (mCBP) to manage electron transport properties of the parent mCBP host. The CN unit donated electron accepting character to the mCBP host and increased electron current density in the device, which improved power efficiency of the blue PHOLEDs from 41.8 lm W−1 to 57.1 lm W−1.

Graphical abstract: Molecular design of host materials for high power efficiency in blue phosphorescent organic light-emitting diodes doped with an imidazole ligand based triplet emitter

Article information

Article type
Paper
Submitted
21 8 2015
Accepted
29 9 2015
First published
14 10 2015

J. Mater. Chem. C, 2016,4, 3792-3797

Molecular design of host materials for high power efficiency in blue phosphorescent organic light-emitting diodes doped with an imidazole ligand based triplet emitter

C. S. Oh, J. Y. Lee, C. H. Noh and S. H. Kim, J. Mater. Chem. C, 2016, 4, 3792 DOI: 10.1039/C5TC02595H

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