Issue 1, 2015

Homoleptic tris-cyclometalated iridium(iii) complexes with phenylimidazole ligands for highly efficient sky-blue OLEDs

Abstract

As an extension of our previous study, three sky-blue homoleptic iridium(III) complexes 1–3 with fluorine-free phenylimidazole ligands were synthesized and their photophysical, electrochemical and thermal properties were studied. All the complexes showed high photoluminescence quantum yields ranging from 0.50 to 0.53. The introduction of a bulky isopropyl group at the 2,6-position of N-phenyl of the phenylimidazole ligands increases the quantum yield and the decomposition temperature of the iridium(III) complexes. As the conjugated system of the ligand becomes larger, a very small bathochromic-shift of 1 nm was observed in complex 3 (475 nm) compared with complexes 1 (474 nm) and 2 (474 nm). All the OLED devices showed high current efficiencies of over 20 cd A−1 at the luminance of 1000 cd m−2. Devices incorporated with complexes 1–3 all showed longer lifetime in comparison with that of a FIrpic-based device.

Graphical abstract: Homoleptic tris-cyclometalated iridium(iii) complexes with phenylimidazole ligands for highly efficient sky-blue OLEDs

Article information

Article type
Paper
Submitted
06 Aug 2014
Accepted
08 Oct 2014
First published
28 Oct 2014

New J. Chem., 2015,39, 246-253

Author version available

Homoleptic tris-cyclometalated iridium(III) complexes with phenylimidazole ligands for highly efficient sky-blue OLEDs

J. Zhuang, W. Li, W. Wu, M. Song, W. Su, M. Zhou and Z. Cui, New J. Chem., 2015, 39, 246 DOI: 10.1039/C4NJ01316F

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