Optical properties and mechanisms in Cr3+,Bi3+-codoped oxide-based spinel nanoparticles

Morgane Pellerin; Cristina Coelho-Diogo; Christian Bonhomme; Nadia Touatib; Laurent Binet; Didier Gourier; Jumpei Ueda; Setsuhisa Tanabe; Bruno Viana; Corinne Chanéac

doi:10.1117/12.2253852

16 February 2017 Optical properties and mechanisms in Cr³⁺, Bi³⁺-codoped oxide-based spinel nanoparticles

Morgane Pellerin, Cristina Coelho-Diogo, Christian Bonhomme, Nadia Touatib, Laurent Binet, Didier Gourier, Jumpei Ueda, Setsuhisa Tanabe, Bruno Viana, Corinne Chanéac

Author Affiliations +

Proceedings Volume 10100, Optical Components and Materials XIV; 101000B (2017) https://doi.org/10.1117/12.2253852
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

At the nanoscale, the ZnGa₂O₄ spinel doped with chromium (III) is an interesting material for in vivo optical imaging due to its bright red persistent luminescence after UV and visible excitation. Moreover its persistent luminescent properties can be improved with the incorporation of bismuth (III) as a co-dopant without any structure changes. The nanoparticles are synthesized by soft chemistry using microwave heating in aqueous media. These very small sized nanophosphors (around 10 nm) present interesting long lasting persistent luminescence after annealing at 1000°C and they can be excited both under UV and under visible LED excitation. In this work we try to understand the mechanisms of the persistent luminescent properties of such nanomaterials. Thermoluminescence is performed to investigate trapping and detrapping processes as well as trap distribution. The chromium local environment is studied by Electron Paramagnetic Resonance. ⁷¹Ga Nuclear Magnetic Resonance is used to get information on the gallium ions repartition (tetrahedral or octahedral site) in the structure. Comparison of optical properties versus local structure increases the understanding of the persistent luminescence mechanism and gives insights to the new modalities for their use as nanoprobes for in vivo imaging.

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Morgane Pellerin, Cristina Coelho-Diogo, Christian Bonhomme, Nadia Touatib, Laurent Binet, Didier Gourier, Jumpei Ueda, Setsuhisa Tanabe, Bruno Viana, and Corinne Chanéac "Optical properties and mechanisms in Cr³⁺, Bi³⁺-codoped oxide-based spinel nanoparticles", Proc. SPIE 10100, Optical Components and Materials XIV, 101000B (16 February 2017); https://doi.org/10.1117/12.2253852

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