Harnessing White-Light Luminescence via Tunable Singlet-and Triplet-Derived Emissions Based on Gold(III) Complexes

Michael Bachmann; Olivier Blacque; Koushik Venkatesan

doi:10.1002/chem.201702341

Harnessing White-Light Luminescence via Tunable Singlet-and Triplet-Derived Emissions Based on Gold(III) Complexes

Chemistry. 2017 Jul 18;23(40):9451-9456. doi: 10.1002/chem.201702341. Epub 2017 Jul 5.

Authors

Michael Bachmann¹, Olivier Blacque¹, Koushik Venkatesan^{1

2}

Affiliations

¹ Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.
² Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2019, Australia.

PMID: 28589572
DOI: 10.1002/chem.201702341

Abstract

White light emitting gold(III) complexes were synthesized by tuning the percentage of metal dπ contribution in the charge transfer. This was achieved through specific tailoring of the ligand scaffold, which led to increase in the HOMO π-energy properties, resulting in a decrease of efficiency on the intersystem crossing (ISC). As a consequence, monomolecular based singlet- and triplet-derived emission covering the entire visible spectrum with quantum yield up to 28 % and CIE-1931 chromaticity coordinates of (0.29, 0.33) to (0.32, 0.40) could be obtained. Furthermore, two complexes displayed excitation-dependent emission property due to hyper-ISC allowing the regulation of the ratio between fluorescence versus phosphorescence intensity and accomplish precise tuning of white light emission.

Keywords: cyclometalation; dual emission; fluorescence; gold; phosphorescence; white light.