Luminescent nano-composites generated from a spray |
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| Authors: | Jose Maurício A Caiut Laurent Bazin Robert Mauricot Hervé Dexpert Sidney JL Ribeiro Jeannette Dexpert-Ghys |
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| Institution: | 1. Centre d’Elaboration de Materiaux et d’Etudes Structurales/CNRS, B.P. 4347, 31055 Toulouse cedex 4, France;2. Institute of Chemistry, São Paulo State University, UNESP, CP 355, Araraquara, SP 14801-970, Brazil;1. Departamento de Engenharia de Materiais, Vitreous Materials Laboratory, Universidade Federal de São Carlos, São Carlos, SP, Brazil;2. Departamento de Quimica, Instituto de Quimica de Araraquara, UNESP, Araraquara, SP, Brazil;3. Laboratório de Materiais Fotonicos, Instituto de Quimica de Araraquara, UNESP, Araraquara, SP, Brazil |
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| Abstract: | The spray-pyrolysis (SP) synthesis technique has been employed to obtain SiO2:Eu3+ and γ-AlOOH:Eu3+. It was possible to obtain sub-micrometric spherical particles of SiO2 with luminescent Eu3+ ions bonded to the silica surface or embedded in amorphous silica beads, by controlling the synthesis and annealing process. Boehmite γ-AlOOH doped with Eu3+ nanoparticles were synthesized by SP at moderate temperature (200 °C) with Eu3+ ions bonded to the surface hydroxyls of the boehmite nanocrystals. Luminescent nano-composites were obtained by controlled reaction of γ-AlOOH:Eu3+ nanocrystals with ASN (asparagine). In these nano-composites, the Eu3+ are held at the surface of the boehmite nanocrystals and partially shielded from interactions with additional luminescence quenchers (hydroxyl groups, water molecules). |
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