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Transferts d'énergie dans des titanates dopés Pr 3+ et application au développement d'afficheurs électroluminescents par pulvérisation cathodique

Abstract : This work reports on the pre-development of inorganic electroluminescent devices based on luminescent CaTiO3 :Pr3+ thin films. It includes two parts. The first part is dedicated to the deposition of CaTiO3: Pr3 + films by sputtering of a home-made target and post-treated for their crystallization. Influence of gas pressure during deposition and post-treatment conditions (temperature, oven…) on the morphology, structure, optical and electrical properties of the films was investigated. Finally, the possibility to obtain films crystallized in the orthorhombic phase, photoluminescent, transparent in the whole visible range and with electrical properties needed for the aimed application, was demonstrated. Conditions for further optimization are also given. The second part of the work aims to use the Intervalence Charge Transfer (IVCT) model that has been recently elaborated in the laboratory, as a tool for the design of new Pr3+-doped phosphors that could be integrated in electroluminescent devices. On this basis, the titanates (Ca,Sr)TiO3 :Pr3+, CaTiO3 :Bi3+ ;Pr3+ and Na1/2Ln1/2TiO3 :Pr3+ (Ln = La, Gd, Y, Lu) were prepared and characterized. The detailed analysis of the photoluminescence behaviors confirmed the IVCT model and allowed to propose new models. Further, the role of Bi3+ codopant as a sensitizer of the Pr3+ luminescence in CaTiO3 is demonstrated and interpreted. The red phosphor CaTiO3 :Bi3+ ;Pr3+ appears as a possible interesting candidate for applications in electroluminescence.
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https://tel.archives-ouvertes.fr/tel-00669553
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Submitted on : Monday, February 13, 2012 - 2:25:01 PM
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  • HAL Id : tel-00669553, version 1

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Ludovic Sarakha. Transferts d'énergie dans des titanates dopés Pr 3+ et application au développement d'afficheurs électroluminescents par pulvérisation cathodique. Autre. Université Blaise Pascal - Clermont-Ferrand II, 2011. Français. ⟨NNT : 2011CLF22105⟩. ⟨tel-00669553⟩

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