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Improved deep-red phosphorescence in cyclometalated iridium complexes via ancillary ligand modification

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Abstract

In this work, we describe bis-cyclometalated iridium complexes with efficient deep-red luminescence. Two different cyclometalating (C^N) ligands-1-phenylisoquinoline (piq) and 2-(2-pyridyl)benzothiophene (btp)-are used with five strong π-donating ancillary ligands (L^X) to furnish a suite of nine new complexes with the general formula Ir(C^N)2(L^X). Improvements in deep-red photoluminescence quantum yields were accomplished by the incorporation of sterically encumbering substituents onto the ancillary ligand, which can enhance the radiative rate constant (kr) and/or reduce the non-radiative rate constant (knr). Five of the complexes were characterized by X-ray crystallography, and all of them were investigated by in-depth spectroscopic and electrochemical measurements.

Graphical abstract: Improved deep-red phosphorescence in cyclometalated iridium complexes via ancillary ligand modification

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Supplementary files

Article information


Submitted
04 Dec 2019
Accepted
06 Feb 2020
First published
07 Feb 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

Improved deep-red phosphorescence in cyclometalated iridium complexes via ancillary ligand modification

E. Kabir, Y. Wu, S. Sittel, B. Nguyen and T. S. Teets, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QI01584A

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