Luminescent Terbium Doped Aluminate Particles: Properties and Surface Modification with Asparagine

Journal of the Brazilian Chemical Society

José M. A. Caiut¹  Younes Messaddeq¹  Hervé Dexpert¹  Marc Verelst¹  Sidney J. L. Ribeiro¹  Jeannette Dexpert-ghys¹ 

关键词: hybrid;    spray pyrolysis;    alumina;    rare earth;    terbium luminescence;   

DOI  :  10.5935/0103-5053.20150213

来源: SciELO

【 摘 要 】

New luminescent organic-inorganic hybrid particles based on Tb-doped aluminates and asparagine (Asn) surface modifiers were investigated. The Tb3+ doped inorganic core was obtained by spray pyrolysis, at 200 ºC γ-AlOOH (BOE:Tbx%) or at 700 ºC γ-Al2O3 (γTA:Tbx%). The reaction of Asn with boehmite in water disaggregated the sub-micronic boehmite particles to give stable dispersion of surface modified nanoparticles Asn:BOE:Tbx% (x = 1 or 5). Concerning the Asn:γTA:Tbx% system, an Asn film wrapping alumina particles was observed. Photoluminescence spectra exhibited the bands assigned to Tb3+5D4 → 7FJ = 6-3 transitions. A broad absorption band (240 nm) was assigned to the host (aluminate) to ion (Tb3+) energy transfer. Efficient energy transfer was observed when active ions are incorporated in the defect-spinel structure of γTA, whereas it was relatively weak for BOE:Tb where Tb3+ are bonded to the hydroxyls groups at nanocrystals surface. It is noticeable that Asn strengthens the linkage of Tb3+ with the aluminate matrix, enhancing the host to dopant energy transfer.

【 授权许可】

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