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Issue 19, 2016
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A facile color-tuning strategy for constructing a library of Ir(iii) complexes with fine-tuned phosphorescence from bluish green to red using a synergetic substituent effect of –OCH3 and –CN at only the C-ring of C^N ligand

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Abstract

By simply grafting a –CN group and/or a –OCH3 group onto the meta- and/or para-site of the C-ring, a series of Ir(III) complexes bearing a similar molecular platform of bis(1,2-diphenyl-1H-benzimidazolato-N,C2′)iridium(III)(acetylacetonate), but showing fine-tuned phosphorescence covering nearly the whole window of the visible spectrum with a wide color-tuning range of 109 nm was acquired. With the help of DFT calculations, it was revealed that if the C-related arene moiety of the C^N ligand (C-ring) contributes substantially to both the HOMO and LUMO of an Ir(III) complex, the concurrent introduction of an electron-donating –OCH3 and an electron-withdrawing –CN groups on the C-ring at the meta- and para-sites relative to the Ir atom may lead to a favorable synergetic substituent effect on the color-tuning direction. This may represent a facile yet effective molecular design strategy for Ir(III) complexes with a desirous emission color. A bluish green organic light-emitting diode (OLED) based on one of the objective complexes displayed a maximum current efficiency of 62.1 cd A−1, an external quantum efficiency of 19.8%, and a brightness of 48 040 cd m−2, implying that high-performance red and blue OLED phosphors as well as libraries of Ir(III) complexes bearing similar molecular platforms may be developed through this –OCH3 and –CN synergetic substitution strategy.

Graphical abstract: A facile color-tuning strategy for constructing a library of Ir(iii) complexes with fine-tuned phosphorescence from bluish green to red using a synergetic substituent effect of –OCH3 and –CN at only the C-ring of C^N ligand

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Supplementary files

Article information


Submitted
13 Jan 2016
Accepted
31 Mar 2016
First published
31 Mar 2016

J. Mater. Chem. C, 2016,4, 4269-4277
Article type
Paper

A facile color-tuning strategy for constructing a library of Ir(III) complexes with fine-tuned phosphorescence from bluish green to red using a synergetic substituent effect of –OCH3 and –CN at only the C-ring of C^N ligand

Y. Jiao, M. Li, N. Wang, T. Lu, L. Zhou, Y. Huang, Z. Lu, D. Luo and X. Pu, J. Mater. Chem. C, 2016, 4, 4269
DOI: 10.1039/C6TC00153J

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