Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 7, Issue 6, Pages 1362-1373Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9qi01584a
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Funding
- National Science Foundation [CHE-1846831]
- Welch Foundation [E-1887]
- Eby Nell McElrath postdoctoral fellowship
- University of Houston
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In this work, we describe bis-cyclometalated iridium complexes with efficient deep-red luminescence. Two different cyclometalating ((CN)-N-boolean AND) ligands-1-phenylisoquinoline (piq) and 2-(2-pyridyl)benzothiophene (btp)-are used with five strong pi-donating ancillary ligands ((LX)-X-boolean AND) to furnish a suite of nine new complexes with the general formula Ir((CN)-N-boolean AND)(2)((LX)-X-boolean AND). 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 (k(r)) and/or reduce the non-radiative rate constant (k(nr)). Five of the complexes were characterized by X-ray crystallography, and all of them were investigated by in-depth spectroscopic and electrochemical measurements.
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