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Recherche de nouvelles couleurs et morphologies dans les matériaux à luminescence persistante

Abstract : Persistant luminescence is the property of some materials to store energy of light (basically UV). This energy is stored as electrons and (or) holes traped by defects. This materials may also be able to give back this energy as visible light or near infrared during some hours. The mecanism involved in this phenomena is still poorly understood. The aim of this PhD project is to clarify this mecanism by studying diferent kinds of persistant luminescence materials and to try this property in a new application field: outdoor applications (sunlight charging) or to able this materials to be excited by non-containing UV lamps (white LEDs). Therefore, it's necessary to learn more about the "charging" process. The PhD student will study to kinds of matrix: i) Transparent ceramics in which nanocristals of persistant luminescence materials will be precipitated. Excitation, trapping and emission phenomena will be studied by optical spectroscopies and EPR after optical excitation. This work will be done at the IRCP in collaboration with Didier Gourier's group (IRCP) and Mathieu Allix (CEMHTI, Orléans). ii) Persistant cristals. Here the student will show and caracterise this phenomena on diferent monocristals in order to get persistant cristals that emit in a wide range of colors. In both cases, the mecanism will be studied from the bulk material to nanoparticles.
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Victor Castaing. Recherche de nouvelles couleurs et morphologies dans les matériaux à luminescence persistante. Matériaux. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEC030⟩. ⟨tel-03199627⟩

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