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Upconversion luminescence of Tm3+ and Yb3+-codoped lutetium oxide nanopowders

Identifieur interne : 001314 ( Main/Exploration ); précédent : 001313; suivant : 001315

Upconversion luminescence of Tm3+ and Yb3+-codoped lutetium oxide nanopowders

Auteurs : LIQIONG AN [République populaire de Chine] ; JIAN ZHANG [République populaire de Chine] ; MIN LIU [République populaire de Chine] ; SHIWEI WANG [République populaire de Chine]

Source :

RBID : Pascal:08-0402967

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English descriptors

Abstract

Lutetium oxide nanopowders codoped with Tm3+ and Yb3+ were synthesized by the co-precipitation method. Upconversion luminescence properties of the powder compacts have been investigated upon continuous wave excitation at 980 nm. Blue emission band was observed by naked eye, which was corresponded to the 1G43H6 transition of Tm3+ ions. However, upconversion spectra revealed that the strongest emission was centered at 809 nm, assigned to the 3H43H6 transition. Weak red emission centered at 651.5 nm was attributed to the 1G43F4 transition while considerably weaker ultraviolet emission centered at 361 nm was ascribed to the 1D23H6transition. The dependence of the intensity of upconversion emissions on the pump power implies two-step and three-step excitation mechanisms of the 3H4 and 1G4 levels, respectively. The possible upconversion schemes are discussed in this paper. Lutetium oxide powders can be sintered into transparent ceramics and high intensity of up-converted IR and blue emissions associated with the 3H43H6 and 1G43H6 transitions of Tm3+ in this matrix may offer lasers potential.


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Le document en format XML

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<sup>3+</sup>
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<title xml:lang="en" level="a">Upconversion luminescence of Tm
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-codoped lutetium oxide nanopowders</title>
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<term>Codoping</term>
<term>Coprecipitation</term>
<term>Energy transfer</term>
<term>Energy-level transitions</term>
<term>Frequency conversion</term>
<term>Lutetium oxides</term>
<term>Nanopowder</term>
<term>Photoluminescence</term>
<term>Powder compaction</term>
<term>Sintering</term>
<term>Thulium additions</term>
<term>Ytterbium additions</term>
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<keywords scheme="Pascal" xml:lang="fr">
<term>Photoluminescence</term>
<term>Codopage</term>
<term>Coprécipitation</term>
<term>Compactage poudre</term>
<term>Transition niveau énergie</term>
<term>Conversion fréquence</term>
<term>Frittage</term>
<term>Transfert énergie</term>
<term>Addition thulium</term>
<term>Addition ytterbium</term>
<term>Oxyde de lutétium</term>
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<front>
<div type="abstract" xml:lang="en">Lutetium oxide nanopowders codoped with Tm
<sup>3+</sup>
and Yb
<sup>3+</sup>
were synthesized by the co-precipitation method. Upconversion luminescence properties of the powder compacts have been investigated upon continuous wave excitation at 980 nm. Blue emission band was observed by naked eye, which was corresponded to the
<sup>1</sup>
G
<sub>4</sub>
<sup>3</sup>
H
<sub>6</sub>
transition of Tm
<sup>3+</sup>
ions. However, upconversion spectra revealed that the strongest emission was centered at 809 nm, assigned to the
<sup>3</sup>
H
<sub>4</sub>
<sup>3</sup>
H
<sub>6</sub>
transition. Weak red emission centered at 651.5 nm was attributed to the
<sup>1</sup>
G
<sub>4</sub>
<sup>3</sup>
F
<sub>4</sub>
transition while considerably weaker ultraviolet emission centered at 361 nm was ascribed to the
<sup>1</sup>
D
<sub>2</sub>
<sup>3</sup>
H
<sub>6</sub>
transition. The dependence of the intensity of upconversion emissions on the pump power implies two-step and three-step excitation mechanisms of the
<sup>3</sup>
H
<sub>4</sub>
and
<sup>1</sup>
G
<sub>4</sub>
levels, respectively. The possible upconversion schemes are discussed in this paper. Lutetium oxide powders can be sintered into transparent ceramics and high intensity of up-converted IR and blue emissions associated with the
<sup>3</sup>
H
<sub>4</sub>
<sup>3</sup>
H
<sub>6</sub>
and
<sup>1</sup>
G
<sub>4</sub>
<sup>3</sup>
H
<sub>6</sub>
transitions of Tm
<sup>3+</sup>
in this matrix may offer lasers potential.</div>
</front>
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