Structural and optical spectroscopy of LiNbO3:Tm nanocrystals embedded in a SiO2 glass matrix
Identifieur interne : 001344 ( Main/Curation ); précédent : 001343; suivant : 001345Structural and optical spectroscopy of LiNbO3:Tm nanocrystals embedded in a SiO2 glass matrix
Auteurs : M. P. F. Graca [Portugal] ; M. Peres [Portugal] ; M. A. Valente [Portugal] ; A. J. Neves [Portugal] ; T. Monteiro [Portugal]Source :
- Journal of non-crystalline solids [ 0022-3093 ] ; 2008.
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- Pascal (Inist)
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- topic : Dopage.
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Abstract
Transparent SiO2:Li2O:Nb2O5 glass doped with Tm3+ has been prepared by the sol-gel method, and heat-treated in air (HT) at temperatures between 500 and 800 °C. X-ray diffraction (XRD) patterns and Raman spectroscopy show SiO2 and LiNbO3 phases in samples HT above 650 °C, and a NbTmO4 phase for T > 750 °C. The XRD SEM analysis show increasing particle size and number with the increase of HT temperature. Intra-4f12 transitions due to Tm3+ ion dispersed in the matrix are observed in samples with T>650°C. The luminescence is dominated by the 1G4→3F4 (∼650nm), 1D2→3F3 (∼780nm), 3 H4 → 3H6 (∼800 nm), 3H5 → 3H6 (∼1200 nm) and 3H4 → 3F4 (∼1500 nm) transitions under resonant excitation to the ion levels.
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Structural and optical spectroscopy of LiNbO<sub>3</sub>
:Tm nanocrystals embedded in a SiO<sub>2</sub>
glass matrix</title>
<author><name sortKey="Graca, M P F" sort="Graca, M P F" uniqKey="Graca M" first="M. P. F." last="Graca">M. P. F. Graca</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Physics Department (13N), Aveiro University, Campus Universitário de Santiago</s1>
<s2>3800-193 Aveiro</s2>
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<sZ>1 aut.</sZ>
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</inist:fA14>
<country>Portugal</country>
<wicri:noRegion>3800-193 Aveiro</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Peres, M" sort="Peres, M" uniqKey="Peres M" first="M." last="Peres">M. Peres</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Physics Department (13N), Aveiro University, Campus Universitário de Santiago</s1>
<s2>3800-193 Aveiro</s2>
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</affiliation>
</author>
<author><name sortKey="Valente, M A" sort="Valente, M A" uniqKey="Valente M" first="M. A." last="Valente">M. A. Valente</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Physics Department (13N), Aveiro University, Campus Universitário de Santiago</s1>
<s2>3800-193 Aveiro</s2>
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<country>Portugal</country>
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</affiliation>
</author>
<author><name sortKey="Neves, A J" sort="Neves, A J" uniqKey="Neves A" first="A. J." last="Neves">A. J. Neves</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Physics Department (13N), Aveiro University, Campus Universitário de Santiago</s1>
<s2>3800-193 Aveiro</s2>
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<country>Portugal</country>
<wicri:noRegion>3800-193 Aveiro</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Monteiro, T" sort="Monteiro, T" uniqKey="Monteiro T" first="T." last="Monteiro">T. Monteiro</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Physics Department (13N), Aveiro University, Campus Universitário de Santiago</s1>
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</analytic>
<series><title level="j" type="main">Journal of non-crystalline solids</title>
<title level="j" type="abbreviated">J. non-cryst. solids</title>
<idno type="ISSN">0022-3093</idno>
<imprint><date when="2008">2008</date>
</imprint>
</series>
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<seriesStmt><title level="j" type="main">Journal of non-crystalline solids</title>
<title level="j" type="abbreviated">J. non-cryst. solids</title>
<idno type="ISSN">0022-3093</idno>
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</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Doping</term>
<term>Energy transfer</term>
<term>Energy-level transitions</term>
<term>Heat treatments</term>
<term>Impurities</term>
<term>Lithium niobates</term>
<term>Nanocrystal</term>
<term>Particle size</term>
<term>Photoluminescence</term>
<term>Raman spectra</term>
<term>Scanning electron microscopy</term>
<term>Sol-gel process</term>
<term>Thulium additions</term>
<term>XRD</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Dopage</term>
<term>Procédé sol gel</term>
<term>Traitement thermique</term>
<term>Diffraction RX</term>
<term>Spectre Raman</term>
<term>Microscopie électronique balayage</term>
<term>Dimension particule</term>
<term>Photoluminescence</term>
<term>Transfert énergie</term>
<term>Transition niveau énergie</term>
<term>Impureté</term>
<term>Addition thulium</term>
<term>Niobate de lithium</term>
<term>Nanocristal</term>
<term>LiNbO3</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Dopage</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Transparent SiO<sub>2</sub>
:Li<sub>2</sub>
O:Nb<sub>2</sub>
O<sub>5</sub>
glass doped with Tm<sup>3+</sup>
has been prepared by the sol-gel method, and heat-treated in air (HT) at temperatures between 500 and 800 °C. X-ray diffraction (XRD) patterns and Raman spectroscopy show SiO<sub>2</sub>
and LiNbO<sub>3</sub>
phases in samples HT above 650 °C, and a NbTmO<sub>4</sub>
phase for T > 750 °C. The XRD SEM analysis show increasing particle size and number with the increase of HT temperature. Intra-4f<sup>12</sup>
transitions due to Tm<sup>3+</sup>
ion dispersed in the matrix are observed in samples with T>650°C. The luminescence is dominated by the <sup>1</sup>
G<sub>4</sub>
→<sup>3</sup>
F<sub>4</sub>
(∼650nm), <sup>1</sup>
D<sub>2</sub>
→<sup>3</sup>
F<sub>3</sub>
(∼780nm), <sup>3</sup>
H<sub>4</sub>
→ <sup>3</sup>
H<sub>6</sub>
(∼800 nm), <sup>3</sup>
H<sub>5</sub>
→ <sup>3</sup>
H<sub>6</sub>
(∼1200 nm) and <sup>3</sup>
H<sub>4</sub>
→ <sup>3</sup>
F<sub>4</sub>
(∼1500 nm) transitions under resonant excitation to the ion levels.</div>
</front>
</TEI>
</record>
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