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Élaboration, caractérisation et modélisation des phénomènes de luminescence du monoaluminate de strontium dopé à l'europium et au dysprosium SrAl2O4

Abstract : This work has been dedicated to the study of a phosphorescent pigment (phosphor), the strontium monoaluminate activated with europium and dysprosium: SrAl2O4 : Eu, Dy. It led to the modeling of the luminescence (fluorescence & thermoluminescence (TL)) (chapter IV). This system is acting as battery. Exposed to sunlight, it stores energy by trapping electrons and holes in the compound's point defects. At ambient temperature, these charge carriers are released and the following recombination process gives rise to the observed green light emission (525nm). The role of each part of the system (the matrix, SrAl2O4, and the doping elements, Eu & Dy) had to be clarified to understand the underlying optoelectronic mechanisms. The first part of this work has thus been dedicated to the matrix study, leading to the set up of a solid state synthesis route, from strontium carbonate and gamma alumina. The influence of the synthesis parameters (reactants' stoechiometry, duration, temperature and atmosphere) allowed to characterize the optoelectronic properties of the matrix (Blue fluorescence at 440nm & 3 TL peaks at -170, -70 and O°C). The dysprosium rolé, the europium one and then their interaction have been particularly studied (chapter III). The green emission has thus been ascribed to divalent europium (Eu2+), while the Eu-Dy interaction is responsible for the phosphorescence process.
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Submitted on : Wednesday, July 10, 2013 - 10:29:25 AM
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  • HAL Id : tel-00843012, version 1

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Christian Beauger. Élaboration, caractérisation et modélisation des phénomènes de luminescence du monoaluminate de strontium dopé à l'europium et au dysprosium SrAl2O4. Génie des procédés. Ecole Nationale Supérieure des Mines de Saint-Etienne, 1999. Français. ⟨NNT : 1999INPG4214⟩. ⟨tel-00843012⟩

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