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Photoluminescence et couplage plasmonique des nanocristaux d'AgInS2-ZnS

Abstract : AgInS2-ZnS nanocrystals are promising materials for the development of non-toxic, highly efficient nano-phosphors. Their size and strong absorption allow them to exploit nano-optical effects potentially enhancing both their absorption and emission processes. This work presents a method combining quantum yield measurements with time resolved emission spectroscopy allowing for the study of both radiative and non-radiative properties of each recombination pathways. Modifying the size, surface chemistry, and core structure of the nanocrystals, we construct a global model explaining the role of their composition and emphasizing the critical aspect of their surface. New strategies are identified to increase the internal quantum yield of these materials. Combining these approaches, it is now possible to expect 90% efficiencies. In a second step, a simulation method was developed to predict the nano-optical effects induced by a plasmonic nanostructure on a given phosphor. We applied this method on core/shell/shell (metal/insulator/AgInS2-ZnS) nanostructures and theoretically determined optimal configurations of the system. A particularly efficient nanostructure achieving coupling on both absorbed and emitted light is identified. Hybrid plasmonic nanostructures are synthesized. Their performances are in accordance with both our understanding of the fluorescence mechanisms of AgInS2-ZnS nanocrystals and the predictions made via simulation.
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https://tel.archives-ouvertes.fr/tel-01697872
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Submitted on : Wednesday, January 31, 2018 - 3:49:45 PM
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  • HAL Id : tel-01697872, version 1

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Théo Chevallier. Photoluminescence et couplage plasmonique des nanocristaux d'AgInS2-ZnS. Science des matériaux [cond-mat.mtrl-sci]. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAY092⟩. ⟨tel-01697872⟩

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