Luminescent beryllium, magnesium, calcium, strontium or barium aluminate nanotubes doped with cerium (III) and co-doped with other lanthanide ions M(1-x-y)N2O4: Cex, Lny

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Patent Details

Publication Number
WO2010114403
PT104486
Priority Date
2009-04-03
Publication Date
2010-10-07
International Patent Classification
C09K11/77

Figures

figura
Image of a luminescent SrAl2O4: Ce3+, Eu2+, Dy3+ nanotube, i.e. strontium aluminate nanotube co-doped with lanthanide ions, obtained by transmission electron microscopy. Scale bar = 120 nm.

Abstract

The present invention provides luminescent aluminate nanotubes doped with rare-earths, namely from the Lanthanide Series of Elements (Ln is La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Tm and Lu), formula of which proves to be M(1-x-y) N2O4:Cex, Lny, where M comprises an alkaline-earth-metal cation consisting of Be, Mg, Ca, Sr, Ba or mixtures thereof, N is Al, accepting the co- doping by a combination of lanthanide ions (co) activators of luminescence, where 0<x≤1 and 0≤y≤1. These nanotubes are obtained by a synthesis process consisting in a heat treatment of post-annealing of precursor micro- and nano-particles under a temperature range of about 573 Kelvin, or more, for a minimum time of 30 minutes, resulting in emissions in the (near) infrared and (visible) ultraviolet regions, wherein said nanotubes can be widely applied in optical devices, such as biomarkers and sensors.

Innovative aspects & main advantages

The innovation of these luminescent nanotubes represents an important advance in the field of luminescent materials at the nanoscale (less than 100 nm) because they can be obtained from a synthesis process on a large scale, which comprises a reaction in the solid state (micro and nano) precursor particles (e.g. monoclinic structure) and subsequent post-annealing (recrystallization), in a temperature range with a lower limit equal to or greater than 573 Kelvin. Moreover, these nanotubes can be obtained on various substrates, with mechanical deposition, pressing and post-annealing using laboratory or industrial techniques that result in this extraordinary nanostructure.

Applications

The nanotubes can be widely applied in optical devices, such as biomarkers and sensors, and in a variety of products with afterglow luminescence resulted from the optical emissions in the (near) infrared and (visible) ultraviolet regions. Furthermore, these inorganic optical nanomaterials present multifunctional properties (ex. thermo-, cathode-, piezo-, sono- and photo-luminescence) with short or long afterglow lifetime. Potential industries for large scale production and/or utilization of our luminescent nanotubes include the chemical, pharmaceutical, medical, materials, artificial lighting sources, equipment manufacturing, and afterglow-in-the-dark luminescent products.

Inventors

Zurba, Nadia

Applicant

Universidade de Aveiro

Groups Involved

G1 - Porous Materials and Nanosystems

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