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