Abstract
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 °C γ-AlOOH (BOE:Tbx%) or at 700 °C γ-Al2O3 (?TA: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.
Highlights
“Alumina” is the general name encompassing a large number of products with different chemical formulas and/or structures
On the basis of these preceding observations, we present here a systematic investigation of Asn:aluminates:Tb nanostructured particles
The peak positions matched with the gamma-alumina standard apart from the absence of (111) and (222), which should be observed in well crystallized transition aluminas.[2,5]
Summary
“Alumina” is the general name encompassing a large number of products with different chemical formulas and/or structures. For the high Asn composition (0.5Asn:1BOE:Tb1%), the sample was observed to be composed off a mixture of nanoparticles and crystallized Asn; concerning the lower content (0.1 Asn), changes on alumina particles were not measureable.
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