Unity fluorescent carbene–gold(I)–acetylide complexes with two-photon absorption and energy-efficient blue FOLEDs

Alexander C. Brannan; Hwan-Hee Cho; Jonathan Daniel; Amelia J. Harvey; Charles T. Smith; Nguyen Le Phuoc; Mikko Linnolahti; Mireille Blanchard-Desce; Neil C. Greenham; Alexander S. Romanov

doi:10.1039/D4TC02845G

Unity fluorescent carbene–gold(i)–acetylide complexes with two-photon absorption and energy-efficient blue FOLEDs†

Alexander C. Brannan,^a Hwan-Hee Cho,

^b Jonathan Daniel,^c Amelia J. Harvey,^a Charles T. Smith,^d Nguyen Le Phuoc,^e Mikko Linnolahti,

*^e Mireille Blanchard-Desce,

*^c Neil C. Greenham

*^b and Alexander S. Romanov

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, The University of Manchester, Oxford Rd, Manchester M13 9PL, UK
E-mail: alexander.romanov@manchester.ac.uk

^b Department of Physics, Cavendish Laboratory, Cambridge University, Cambridge, UK
E-mail: ncg11@cam.ac.uk

^c Institut des Sciences Moléculaires (ISM, UMR5255), University of Bordeaux, Centre National de la Recherche Scientifique, Institut Polytechnique de Bordeaux, Bat A12, 351 Cours de la Libération, 33405 Talence, France
E-mail: mireille.blanchard-desce@u-bordeaux.fr

^d Department of Physics and Astronomy and the Photon Science Institute, The University of Manchester, Oxford Road, Manchester, UK

^e Department of Chemistry, University of Eastern Finland, FI-80101 Joensuu, Finland
E-mail: mikko.linnolahti@uef.fi

Abstract

Two fluorescent organometallic “carbene–gold(I)–acetylide” (CMAc) complexes based on bicyclic alkyl(amino) carbene (BIC), 4-ethynyl-2,1,3-benzothiadiazole (Au1) and 4,7-diethynyl-2,1,3-benzothiadiazole (Au2) have been synthesized and characterized. Compounds Au1 and Au2 exhibit blue to yellow fluorescence with up to unity fluorescence quantum yields and radiative rates exceeding 10⁸ s⁻¹. The dipolar Au1 complex exhibits a low two photon absorption cross-section (2PA σ₂) of 0.8 GM, whereas the quadrupolar Au2 complex shows a high 2PA σ₂ value of 90 GM. A fluorescent CMAc organic light emitting diode (OLED) emits blue electroluminescence with up to 4.7% external quantum efficiency.

This article is part of the themed collection: Celebrating the 200th Anniversary of the University of Manchester

Journal of Materials Chemistry C

Unity fluorescent carbene–gold(i)–acetylide complexes with two-photon absorption and energy-efficient blue FOLEDs†

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Unity fluorescent carbene–gold(I)–acetylide complexes with two-photon absorption and energy-efficient blue FOLEDs

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