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2021-03-18
Chemistry of Materials 33,7:2457–2465

Enhancement of X-ray-Excited Red Luminescence of Chromium-Doped Zinc Gallate via Ultrasmall Silicon Carbide Nanocrystals

doi:10.1021/acs.chemmater.0c04671

X-ray-activated near-infrared luminescent nanoparticles are considered as new alternative optical probes due to being free of autofluorescence, while both their excitation and emission possess a high penetration efficacy in vivo. Herein, we report silicon carbide quantum dot sensitization of trivalent chromium-doped zinc gallate nanoparticles with enhanced near-infrared emission upon X-ray and UV–vis light excitation. We have found that a ZnGa2O4 shell is formed around the SiC nanoparticles during seeded hydrothermal growth, and SiC increases the emission efficiency up to 1 order of magnitude due to band alignment that channels the excited electrons to the chromium ion.

Authors
Beke Dávid
Marco V. Nardi
Bortel Gábor
Melanie Timpel
Czigány Zsolt
Luca Pasquali
Andrea Chiappini
Giorgio Bais
Rudolf Mátyás
Zalka Dóra
Franca Bigi
Francesca Rossi
Bencs László
Pekker Áron
Márkus G. Bence
Giancarlo Salviati
Stephen E. Saddow
Kamarás Katalin
Ferenc Simon
Ádám Gali
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