Issue 6, 2020

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

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

Supplementary files

Article information

Article type
Research Article
Submitted
04 Dec 2019
Accepted
06 Feb 2020
First published
07 Feb 2020

Inorg. Chem. Front., 2020,7, 1362-1373

Author version available

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, 7, 1362 DOI: 10.1039/C9QI01584A

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