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Surface-Enhanced Luminescence of Cr3+‒doped ZnAl2O4 and MgAl2O4 using Ag@SiO2 and Au@SiO2 core-shell nanoparticles

Abstract : In this work, we investigate the significant interest of chromium-doped spinels (CDS) resulting in their characteristic red photoluminescence (PL) due to the strong crystal field and the octahedral coordination of the Cr3+ ion. An increase in the luminescence efficiency of these CDSs by interaction with plasmon excitation is studied with the objective of more efficient luminescence. We successfully synthesized the CDS using the citrate sol-gel method and metallic nanoparticles (MNPs), using the classical citrate-reduction method. Additionally, we covered the MNPs with silica shells, which were used to modify a surface. The surface-enhanced effect exerted by modified surfaces (MS) with Ag@SiO2 and Au@SiO2 core-shell nanoparticles on the PL of two CDS is studied. The silica shell of MNPs is used as a separator between the MNPs@SiO2-modified surface and CDS. An enhancement of CDS PL was found for CDS coupled to MNPs with respect to uncoupled CDS. The PL enhancement factor as well as the lifetimes were investigated. The interaction of CDS with MNPs has been investigated, and several factors were found to influence the PL of CDS. The main mechanism explaining the PL enhancement has been proposed. Our better understanding of the surface-enhanced luminescence (SEL) of CDS may lead to further improvement of this kind of system.
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https://hal.archives-ouvertes.fr/hal-03676326
Contributor : Julien Cardin Connect in order to contact the contributor
Submitted on : Monday, May 23, 2022 - 6:22:43 PM
Last modification on : Tuesday, June 14, 2022 - 7:09:05 AM

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  • HAL Id : hal-03676326, version 1

Citation

Rodrigo A. Valenzuela-Fernández, Julien Cardin, Xavier Portier, Christophe Labbé, Camilo Segura, et al.. Surface-Enhanced Luminescence of Cr3+‒doped ZnAl2O4 and MgAl2O4 using Ag@SiO2 and Au@SiO2 core-shell nanoparticles. Materials Advances, Royal Society of Chemistry, 2022. ⟨hal-03676326⟩

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