Increase of the blue upconversion emission in YAG:Tm3+ nanopowders by codoping with Yb3+ ions
Identifieur interne :
000655 ( Pascal/Corpus );
précédent :
000654;
suivant :
000656
Increase of the blue upconversion emission in YAG:Tm3+ nanopowders by codoping with Yb3+ ions
Auteurs : P. Haro-Gonzalez ;
I. R. Martin ;
S. Gonzalez-Perez ;
M. Liu ;
S. W. Wang ;
N. Capuj ;
F. LahozSource :
-
Journal of luminescence [ 0022-2313 ] ; 2008.
RBID : Pascal:08-0285317
Descripteurs français
- Pascal (Inist)
- Photoluminescence,
Codopage,
Coprécipitation,
Dimension particule,
Dépendance temps,
Conversion fréquence,
Etat excité,
Addition ytterbium,
Addition thulium,
Etat impureté,
Processus 2 photons,
Grenat aluminium yttrium,
Nanopoudre,
Nanocristal.
English descriptors
- KwdEn :
- Codoping,
Coprecipitation,
Excited states,
Frequency conversion,
Impurity states,
Nanocrystal,
Nanopowder,
Particle size,
Photoluminescence,
Thulium additions,
Time dependence,
Two-photon processes,
YAG,
Ytterbium additions.
Abstract
The YAG nanopowders were prepared by a co-precipitation method using nitrate and ammonium hydrogen carbonate as raw materials. To obtain homogenous precipitate, reverse-strike (adding salt solutions to the precipitant solution) technique was adopted. Therefore, single (Tm3+) and codoped (Tm3+-Yb3+) YAG nanopowders with a size between 40-90 nm have been obtained. Blue upconversion emission at around 480 nm has been found in YAG: Tm3+ nanopowders under excitation to the 3H4 level of Tm3 + at around 800 nm. However, this upconversion emission in nanopowders codoped with Tm3+-Yb3+ ions is increased by a factor of about 10. The analysis of the temporal evolution of the involved levels and the dependence of the upconversion intensity on the pump power at 800 nm allowed to distinguish the upconversion mechanism. In YAG: Tm3+ nanopowders the upconversion mechanism is due to excited state absorption processes. However, in the codoped samples, Yb3+ ions acts as the sensitizers; in consequence, the blue upconversion is strongly increased.
Notice en format standard (ISO 2709)
Pour connaître la documentation sur le format Inist Standard.
| pA |
| A01 | 01 | 1 | | @0 0022-2313 |
|---|
| A02 | 01 | | | @0 JLUMA8 |
|---|
| A03 | | 1 | | @0 J. lumin. |
|---|
| A05 | | | | @2 128 |
|---|
| A06 | | | | @2 5-6 |
|---|
| A08 | 01 | 1 | ENG | @1 Increase of the blue upconversion emission in YAG:Tm3+ nanopowders by codoping with Yb3+ ions |
|---|
| A09 | 01 | 1 | ENG | @1 Proceesings of th 16th International Conference on Dynamical processes in Excited States of Solids |
|---|
| A11 | 01 | 1 | | @1 HARO-GONZALEZ (P.) |
|---|
| A11 | 02 | 1 | | @1 MARTIN (I. R.) |
|---|
| A11 | 03 | 1 | | @1 GONZALEZ-PEREZ (S.) |
|---|
| A11 | 04 | 1 | | @1 LIU (M.) |
|---|
| A11 | 05 | 1 | | @1 WANG (S. W.) |
|---|
| A11 | 06 | 1 | | @1 CAPUJ (N.) |
|---|
| A11 | 07 | 1 | | @1 LAHOZ (F.) |
|---|
| A12 | 01 | 1 | | @1 GARCIA-SOLE (José) @9 ed. |
|---|
| A12 | 02 | 1 | | @1 DE ANDRES (Alicia) @9 ed. |
|---|
| A12 | 03 | 1 | | @1 BAUSA (Luisa) @9 ed. |
|---|
| A14 | 01 | | | @1 Departamento de Física Fundamental y Experimental, Electrdnica y Sistemas, Universidad de La Laguna @2 38206 La Laguna, Tenerife @3 ESP @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 7 aut. |
|---|
| A14 | 02 | | | @1 Shanghai Institute of Ceramics, Chinese Academy of Sciences @2 Shanghai 200050 @3 CHN @Z 4 aut. @Z 5 aut. |
|---|
| A14 | 03 | | | @1 Departamento de Física Básica, Universidad de La Laguna @2 38206 La Laguna,Tenerife @3 ESP @Z 6 aut. |
|---|
| A15 | 01 | | | @1 Departamento de Física de Materiales, Universidad Autónoma de Madrid @2 28049 Madrid @3 ESP @Z 1 aut. @Z 2 aut. |
|---|
| A15 | 02 | | | @1 Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas @2 28049 Madrid @3 ESP @Z 3 aut. |
|---|
| A20 | | | | @1 924-926 |
|---|
| A21 | | | | @1 2008 |
|---|
| A23 | 01 | | | @0 ENG |
|---|
| A43 | 01 | | | @1 INIST @2 14666 @5 354000172659770680 |
|---|
| A44 | | | | @0 0000 @1 © 2008 INIST-CNRS. All rights reserved. |
|---|
| A45 | | | | @0 8 ref. |
|---|
| A47 | 01 | 1 | | @0 08-0285317 |
|---|
| A60 | | | | @1 P @2 C |
|---|
| A61 | | | | @0 A |
|---|
| A64 | 01 | 1 | | @0 Journal of luminescence |
|---|
| A66 | 01 | | | @0 NLD |
|---|
| C01 | 01 | | ENG | @0 The YAG nanopowders were prepared by a co-precipitation method using nitrate and ammonium hydrogen carbonate as raw materials. To obtain homogenous precipitate, reverse-strike (adding salt solutions to the precipitant solution) technique was adopted. Therefore, single (Tm3+) and codoped (Tm3+-Yb3+) YAG nanopowders with a size between 40-90 nm have been obtained. Blue upconversion emission at around 480 nm has been found in YAG: Tm3+ nanopowders under excitation to the 3H4 level of Tm3 + at around 800 nm. However, this upconversion emission in nanopowders codoped with Tm3+-Yb3+ ions is increased by a factor of about 10. The analysis of the temporal evolution of the involved levels and the dependence of the upconversion intensity on the pump power at 800 nm allowed to distinguish the upconversion mechanism. In YAG: Tm3+ nanopowders the upconversion mechanism is due to excited state absorption processes. However, in the codoped samples, Yb3+ ions acts as the sensitizers; in consequence, the blue upconversion is strongly increased. |
|---|
| C02 | 01 | 3 | | @0 001B70H67B |
|---|
| C03 | 01 | 3 | FRE | @0 Photoluminescence @5 02 |
|---|
| C03 | 01 | 3 | ENG | @0 Photoluminescence @5 02 |
|---|
| C03 | 02 | X | FRE | @0 Codopage @5 03 |
|---|
| C03 | 02 | X | ENG | @0 Codoping @5 03 |
|---|
| C03 | 02 | X | SPA | @0 Codrogado @5 03 |
|---|
| C03 | 03 | 3 | FRE | @0 Coprécipitation @5 04 |
|---|
| C03 | 03 | 3 | ENG | @0 Coprecipitation @5 04 |
|---|
| C03 | 04 | 3 | FRE | @0 Dimension particule @5 05 |
|---|
| C03 | 04 | 3 | ENG | @0 Particle size @5 05 |
|---|
| C03 | 05 | 3 | FRE | @0 Dépendance temps @5 06 |
|---|
| C03 | 05 | 3 | ENG | @0 Time dependence @5 06 |
|---|
| C03 | 06 | X | FRE | @0 Conversion fréquence @5 07 |
|---|
| C03 | 06 | X | ENG | @0 Frequency conversion @5 07 |
|---|
| C03 | 06 | X | SPA | @0 Conversión frecuencia @5 07 |
|---|
| C03 | 07 | 3 | FRE | @0 Etat excité @5 08 |
|---|
| C03 | 07 | 3 | ENG | @0 Excited states @5 08 |
|---|
| C03 | 08 | 3 | FRE | @0 Addition ytterbium @5 09 |
|---|
| C03 | 08 | 3 | ENG | @0 Ytterbium additions @5 09 |
|---|
| C03 | 09 | 3 | FRE | @0 Addition thulium @5 10 |
|---|
| C03 | 09 | 3 | ENG | @0 Thulium additions @5 10 |
|---|
| C03 | 10 | 3 | FRE | @0 Etat impureté @5 11 |
|---|
| C03 | 10 | 3 | ENG | @0 Impurity states @5 11 |
|---|
| C03 | 11 | 3 | FRE | @0 Processus 2 photons @5 12 |
|---|
| C03 | 11 | 3 | ENG | @0 Two-photon processes @5 12 |
|---|
| C03 | 12 | 3 | FRE | @0 Grenat aluminium yttrium @5 16 |
|---|
| C03 | 12 | 3 | ENG | @0 YAG @5 16 |
|---|
| C03 | 13 | X | FRE | @0 Nanopoudre @5 18 |
|---|
| C03 | 13 | X | ENG | @0 Nanopowder @5 18 |
|---|
| C03 | 13 | X | SPA | @0 Nanopolvo @5 18 |
|---|
| C03 | 14 | X | FRE | @0 Nanocristal @5 19 |
|---|
| C03 | 14 | X | ENG | @0 Nanocrystal @5 19 |
|---|
| C03 | 14 | X | SPA | @0 Nanocristal @5 19 |
|---|
| N21 | | | | @1 182 |
|---|
|
|---|
| pR |
| A30 | 01 | 1 | ENG | @1 International Conference on Dynamical processes in Excited States of Solids, DPC 07 @2 16 @3 Segovia ESP @4 2007-06-17 |
|---|
|
|---|
Format Inist (serveur)
| NO : | PASCAL 08-0285317 INIST |
|---|
| ET : | Increase of the blue upconversion emission in YAG:Tm3+ nanopowders by codoping with Yb3+ ions |
|---|
| AU : | HARO-GONZALEZ (P.); MARTIN (I. R.); GONZALEZ-PEREZ (S.); LIU (M.); WANG (S. W.); CAPUJ (N.); LAHOZ (F.); GARCIA-SOLE (José); DE ANDRES (Alicia); BAUSA (Luisa) |
|---|
| AF : | Departamento de Física Fundamental y Experimental, Electrdnica y Sistemas, Universidad de La Laguna/38206 La Laguna, Tenerife/Espagne (1 aut., 2 aut., 3 aut., 7 aut.); Shanghai Institute of Ceramics, Chinese Academy of Sciences/Shanghai 200050/Chine (4 aut., 5 aut.); Departamento de Física Básica, Universidad de La Laguna/38206 La Laguna,Tenerife/Espagne (6 aut.); Departamento de Física de Materiales, Universidad Autónoma de Madrid/28049 Madrid/Espagne (1 aut., 2 aut.); Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas/28049 Madrid/Espagne (3 aut.) |
|---|
| DT : | Publication en série; Congrès; Niveau analytique |
|---|
| SO : | Journal of luminescence; ISSN 0022-2313; Coden JLUMA8; Pays-Bas; Da. 2008; Vol. 128; No. 5-6; Pp. 924-926; Bibl. 8 ref. |
|---|
| LA : | Anglais |
|---|
| EA : | The YAG nanopowders were prepared by a co-precipitation method using nitrate and ammonium hydrogen carbonate as raw materials. To obtain homogenous precipitate, reverse-strike (adding salt solutions to the precipitant solution) technique was adopted. Therefore, single (Tm3+) and codoped (Tm3+-Yb3+) YAG nanopowders with a size between 40-90 nm have been obtained. Blue upconversion emission at around 480 nm has been found in YAG: Tm3+ nanopowders under excitation to the 3H4 level of Tm3 + at around 800 nm. However, this upconversion emission in nanopowders codoped with Tm3+-Yb3+ ions is increased by a factor of about 10. The analysis of the temporal evolution of the involved levels and the dependence of the upconversion intensity on the pump power at 800 nm allowed to distinguish the upconversion mechanism. In YAG: Tm3+ nanopowders the upconversion mechanism is due to excited state absorption processes. However, in the codoped samples, Yb3+ ions acts as the sensitizers; in consequence, the blue upconversion is strongly increased. |
|---|
| CC : | 001B70H67B |
|---|
| FD : | Photoluminescence; Codopage; Coprécipitation; Dimension particule; Dépendance temps; Conversion fréquence; Etat excité; Addition ytterbium; Addition thulium; Etat impureté; Processus 2 photons; Grenat aluminium yttrium; Nanopoudre; Nanocristal |
|---|
| ED : | Photoluminescence; Codoping; Coprecipitation; Particle size; Time dependence; Frequency conversion; Excited states; Ytterbium additions; Thulium additions; Impurity states; Two-photon processes; YAG; Nanopowder; Nanocrystal |
|---|
| SD : | Codrogado; Conversión frecuencia; Nanopolvo; Nanocristal |
|---|
| LO : | INIST-14666.354000172659770680 |
|---|
| ID : | 08-0285317 |
|---|
Links to Exploration step
Pascal:08-0285317
Le document en format XML
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</publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Increase of the blue upconversion emission in YAG:Tm<sup>3+</sup>
nanopowders by codoping with Yb<sup>3+</sup>
ions</title><author><name sortKey="Haro Gonzalez, P" sort="Haro Gonzalez, P" uniqKey="Haro Gonzalez P" first="P." last="Haro-Gonzalez">P. Haro-Gonzalez</name>
<affiliation><inist:fA14 i1="01"><s1>Departamento de Física Fundamental y Experimental, Electrdnica y Sistemas, Universidad de La Laguna</s1>
<s2>38206 La Laguna, Tenerife</s2>
<s3>ESP</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14><author><name sortKey="Martin, I R" sort="Martin, I R" uniqKey="Martin I" first="I. R." last="Martin">I. R. Martin</name>
<affiliation><inist:fA14 i1="01"><s1>Departamento de Física Fundamental y Experimental, Electrdnica y Sistemas, Universidad de La Laguna</s1>
<s2>38206 La Laguna, Tenerife</s2>
<s3>ESP</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14><author><name sortKey="Gonzalez Perez, S" sort="Gonzalez Perez, S" uniqKey="Gonzalez Perez S" first="S." last="Gonzalez-Perez">S. Gonzalez-Perez</name>
<affiliation><inist:fA14 i1="01"><s1>Departamento de Física Fundamental y Experimental, Electrdnica y Sistemas, Universidad de La Laguna</s1>
<s2>38206 La Laguna, Tenerife</s2>
<s3>ESP</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14><author><name sortKey="Liu, M" sort="Liu, M" uniqKey="Liu M" first="M." last="Liu">M. Liu</name>
<affiliation><inist:fA14 i1="02"><s1>Shanghai Institute of Ceramics, Chinese Academy of Sciences</s1>
<s2>Shanghai 200050</s2>
<s3>CHN</s3>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14><author><name sortKey="Wang, S W" sort="Wang, S W" uniqKey="Wang S" first="S. W." last="Wang">S. W. Wang</name>
<affiliation><inist:fA14 i1="02"><s1>Shanghai Institute of Ceramics, Chinese Academy of Sciences</s1>
<s2>Shanghai 200050</s2>
<s3>CHN</s3>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14><author><name sortKey="Capuj, N" sort="Capuj, N" uniqKey="Capuj N" first="N." last="Capuj">N. Capuj</name>
<affiliation><inist:fA14 i1="03"><s1>Departamento de Física Básica, Universidad de La Laguna</s1>
<s2>38206 La Laguna,Tenerife</s2>
<s3>ESP</s3>
<sZ>6 aut.</sZ>
</inist:fA14><author><name sortKey="Lahoz, F" sort="Lahoz, F" uniqKey="Lahoz F" first="F." last="Lahoz">F. Lahoz</name>
<affiliation><inist:fA14 i1="01"><s1>Departamento de Física Fundamental y Experimental, Electrdnica y Sistemas, Universidad de La Laguna</s1>
<s2>38206 La Laguna, Tenerife</s2>
<s3>ESP</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14><series><title level="j" type="main">Journal of luminescence</title>
<title level="j" type="abbreviated">J. lumin.</title>
<idno type="ISSN">0022-2313</idno>
<imprint><date when="2008">2008</date>
</imprint><seriesStmt><title level="j" type="main">Journal of luminescence</title>
<title level="j" type="abbreviated">J. lumin.</title>
<idno type="ISSN">0022-2313</idno>
</seriesStmt><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Codoping</term>
<term>Coprecipitation</term>
<term>Excited states</term>
<term>Frequency conversion</term>
<term>Impurity states</term>
<term>Nanocrystal</term>
<term>Nanopowder</term>
<term>Particle size</term>
<term>Photoluminescence</term>
<term>Thulium additions</term>
<term>Time dependence</term>
<term>Two-photon processes</term>
<term>YAG</term>
<term>Ytterbium additions</term>
</keywords><keywords scheme="Pascal" xml:lang="fr"><term>Photoluminescence</term>
<term>Codopage</term>
<term>Coprécipitation</term>
<term>Dimension particule</term>
<term>Dépendance temps</term>
<term>Conversion fréquence</term>
<term>Etat excité</term>
<term>Addition ytterbium</term>
<term>Addition thulium</term>
<term>Etat impureté</term>
<term>Processus 2 photons</term>
<term>Grenat aluminium yttrium</term>
<term>Nanopoudre</term>
<term>Nanocristal</term>
</keywords><front><div type="abstract" xml:lang="en">The YAG nanopowders were prepared by a co-precipitation method using nitrate and ammonium hydrogen carbonate as raw materials. To obtain homogenous precipitate, reverse-strike (adding salt solutions to the precipitant solution) technique was adopted. Therefore, single (Tm<sup>3+</sup>
) and codoped (Tm<sup>3+</sup>
-Yb<sup>3+</sup>
) YAG nanopowders with a size between 40-90 nm have been obtained. Blue upconversion emission at around 480 nm has been found in YAG: Tm<sup>3+</sup>
nanopowders under excitation to the <sup>3</sup>
H<sub>4</sub>
level of Tm<sup>3</sup>
<sup>+</sup>
at around 800 nm. However, this upconversion emission in nanopowders codoped with Tm<sup>3+</sup>
-Yb<sup>3+</sup>
ions is increased by a factor of about 10. The analysis of the temporal evolution of the involved levels and the dependence of the upconversion intensity on the pump power at 800 nm allowed to distinguish the upconversion mechanism. In YAG: Tm<sup>3+</sup>
nanopowders the upconversion mechanism is due to excited state absorption processes. However, in the codoped samples, Yb<sup>3+</sup>
ions acts as the sensitizers; in consequence, the blue upconversion is strongly increased.</div><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0022-2313</s0>
</fA01><fA02 i1="01"><s0>JLUMA8</s0>
</fA02><fA03 i2="1"><s0>J. lumin.</s0>
</fA03><fA05><s2>128</s2>
</fA05><fA06><s2>5-6</s2>
</fA06><fA08 i1="01" i2="1" l="ENG"><s1>Increase of the blue upconversion emission in YAG:Tm<sup>3+</sup>
nanopowders by codoping with Yb<sup>3+</sup>
ions</s1><fA09 i1="01" i2="1" l="ENG"><s1>Proceesings of th 16th International Conference on Dynamical processes in Excited States of Solids</s1>
</fA09><fA11 i1="01" i2="1"><s1>HARO-GONZALEZ (P.)</s1>
</fA11><fA11 i1="02" i2="1"><s1>MARTIN (I. R.)</s1>
</fA11><fA11 i1="03" i2="1"><s1>GONZALEZ-PEREZ (S.)</s1>
</fA11><fA11 i1="04" i2="1"><s1>LIU (M.)</s1>
</fA11><fA11 i1="05" i2="1"><s1>WANG (S. W.)</s1>
</fA11><fA11 i1="06" i2="1"><s1>CAPUJ (N.)</s1>
</fA11><fA11 i1="07" i2="1"><s1>LAHOZ (F.)</s1>
</fA11><fA12 i1="01" i2="1"><s1>GARCIA-SOLE (José)</s1>
<s9>ed.</s9>
</fA12><fA12 i1="02" i2="1"><s1>DE ANDRES (Alicia)</s1>
<s9>ed.</s9>
</fA12><fA12 i1="03" i2="1"><s1>BAUSA (Luisa)</s1>
<s9>ed.</s9>
</fA12><fA14 i1="01"><s1>Departamento de Física Fundamental y Experimental, Electrdnica y Sistemas, Universidad de La Laguna</s1>
<s2>38206 La Laguna, Tenerife</s2>
<s3>ESP</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>7 aut.</sZ>
</fA14><fA14 i1="02"><s1>Shanghai Institute of Ceramics, Chinese Academy of Sciences</s1>
<s2>Shanghai 200050</s2>
<s3>CHN</s3>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</fA14><fA14 i1="03"><s1>Departamento de Física Básica, Universidad de La Laguna</s1>
<s2>38206 La Laguna,Tenerife</s2>
<s3>ESP</s3>
<sZ>6 aut.</sZ>
</fA14><fA15 i1="01"><s1>Departamento de Física de Materiales, Universidad Autónoma de Madrid</s1>
<s2>28049 Madrid</s2>
<s3>ESP</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
</fA15><fA15 i1="02"><s1>Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas</s1>
<s2>28049 Madrid</s2>
<s3>ESP</s3>
<sZ>3 aut.</sZ>
</fA15><fA20><s1>924-926</s1>
</fA20><fA21><s1>2008</s1>
</fA21><fA23 i1="01"><s0>ENG</s0>
</fA23><fA43 i1="01"><s1>INIST</s1>
<s2>14666</s2>
<s5>354000172659770680</s5>
</fA43><fA44><s0>0000</s0>
<s1>© 2008 INIST-CNRS. All rights reserved.</s1>
</fA44><fA45><s0>8 ref.</s0>
</fA45><fA47 i1="01" i2="1"><s0>08-0285317</s0>
</fA47><fA60><s1>P</s1>
<s2>C</s2>
</fA60><fA64 i1="01" i2="1"><s0>Journal of luminescence</s0>
</fA64><fA66 i1="01"><s0>NLD</s0>
</fA66><fC01 i1="01" l="ENG"><s0>The YAG nanopowders were prepared by a co-precipitation method using nitrate and ammonium hydrogen carbonate as raw materials. To obtain homogenous precipitate, reverse-strike (adding salt solutions to the precipitant solution) technique was adopted. Therefore, single (Tm<sup>3+</sup>
) and codoped (Tm<sup>3+</sup>
-Yb<sup>3+</sup>
) YAG nanopowders with a size between 40-90 nm have been obtained. Blue upconversion emission at around 480 nm has been found in YAG: Tm<sup>3+</sup>
nanopowders under excitation to the <sup>3</sup>
H<sub>4</sub>
level of Tm<sup>3</sup>
<sup>+</sup>
at around 800 nm. However, this upconversion emission in nanopowders codoped with Tm<sup>3+</sup>
-Yb<sup>3+</sup>
ions is increased by a factor of about 10. The analysis of the temporal evolution of the involved levels and the dependence of the upconversion intensity on the pump power at 800 nm allowed to distinguish the upconversion mechanism. In YAG: Tm<sup>3+</sup>
nanopowders the upconversion mechanism is due to excited state absorption processes. However, in the codoped samples, Yb<sup>3+</sup>
ions acts as the sensitizers; in consequence, the blue upconversion is strongly increased.</s0><fC02 i1="01" i2="3"><s0>001B70H67B</s0>
</fC02><fC03 i1="01" i2="3" l="FRE"><s0>Photoluminescence</s0>
<s5>02</s5>
</fC03><fC03 i1="01" i2="3" l="ENG"><s0>Photoluminescence</s0>
<s5>02</s5>
</fC03><fC03 i1="02" i2="X" l="FRE"><s0>Codopage</s0>
<s5>03</s5>
</fC03><fC03 i1="02" i2="X" l="ENG"><s0>Codoping</s0>
<s5>03</s5>
</fC03><fC03 i1="02" i2="X" l="SPA"><s0>Codrogado</s0>
<s5>03</s5>
</fC03><fC03 i1="03" i2="3" l="FRE"><s0>Coprécipitation</s0>
<s5>04</s5>
</fC03><fC03 i1="03" i2="3" l="ENG"><s0>Coprecipitation</s0>
<s5>04</s5>
</fC03><fC03 i1="04" i2="3" l="FRE"><s0>Dimension particule</s0>
<s5>05</s5>
</fC03><fC03 i1="04" i2="3" l="ENG"><s0>Particle size</s0>
<s5>05</s5>
</fC03><fC03 i1="05" i2="3" l="FRE"><s0>Dépendance temps</s0>
<s5>06</s5>
</fC03><fC03 i1="05" i2="3" l="ENG"><s0>Time dependence</s0>
<s5>06</s5>
</fC03><fC03 i1="06" i2="X" l="FRE"><s0>Conversion fréquence</s0>
<s5>07</s5>
</fC03><fC03 i1="06" i2="X" l="ENG"><s0>Frequency conversion</s0>
<s5>07</s5>
</fC03><fC03 i1="06" i2="X" l="SPA"><s0>Conversión frecuencia</s0>
<s5>07</s5>
</fC03><fC03 i1="07" i2="3" l="FRE"><s0>Etat excité</s0>
<s5>08</s5>
</fC03><fC03 i1="07" i2="3" l="ENG"><s0>Excited states</s0>
<s5>08</s5>
</fC03><fC03 i1="08" i2="3" l="FRE"><s0>Addition ytterbium</s0>
<s5>09</s5>
</fC03><fC03 i1="08" i2="3" l="ENG"><s0>Ytterbium additions</s0>
<s5>09</s5>
</fC03><fC03 i1="09" i2="3" l="FRE"><s0>Addition thulium</s0>
<s5>10</s5>
</fC03><fC03 i1="09" i2="3" l="ENG"><s0>Thulium additions</s0>
<s5>10</s5>
</fC03><fC03 i1="10" i2="3" l="FRE"><s0>Etat impureté</s0>
<s5>11</s5>
</fC03><fC03 i1="10" i2="3" l="ENG"><s0>Impurity states</s0>
<s5>11</s5>
</fC03><fC03 i1="11" i2="3" l="FRE"><s0>Processus 2 photons</s0>
<s5>12</s5>
</fC03><fC03 i1="11" i2="3" l="ENG"><s0>Two-photon processes</s0>
<s5>12</s5>
</fC03><fC03 i1="12" i2="3" l="FRE"><s0>Grenat aluminium yttrium</s0>
<s5>16</s5>
</fC03><fC03 i1="12" i2="3" l="ENG"><s0>YAG</s0>
<s5>16</s5>
</fC03><fC03 i1="13" i2="X" l="FRE"><s0>Nanopoudre</s0>
<s5>18</s5>
</fC03><fC03 i1="13" i2="X" l="ENG"><s0>Nanopowder</s0>
<s5>18</s5>
</fC03><fC03 i1="13" i2="X" l="SPA"><s0>Nanopolvo</s0>
<s5>18</s5>
</fC03><fC03 i1="14" i2="X" l="FRE"><s0>Nanocristal</s0>
<s5>19</s5>
</fC03><fC03 i1="14" i2="X" l="ENG"><s0>Nanocrystal</s0>
<s5>19</s5>
</fC03><fC03 i1="14" i2="X" l="SPA"><s0>Nanocristal</s0>
<s5>19</s5>
</fC03><fN21><s1>182</s1>
</fN21><pR><fA30 i1="01" i2="1" l="ENG"><s1>International Conference on Dynamical processes in Excited States of Solids, DPC 07</s1>
<s2>16</s2>
<s3>Segovia ESP</s3>
<s4>2007-06-17</s4>
</fA30><server><NO>PASCAL 08-0285317 INIST</NO>
<ET>Increase of the blue upconversion emission in YAG:Tm<sup>3+</sup>
nanopowders by codoping with Yb<sup>3+</sup>
ions</ET><AU>HARO-GONZALEZ (P.); MARTIN (I. R.); GONZALEZ-PEREZ (S.); LIU (M.); WANG (S. W.); CAPUJ (N.); LAHOZ (F.); GARCIA-SOLE (José); DE ANDRES (Alicia); BAUSA (Luisa)</AU>
<AF>Departamento de Física Fundamental y Experimental, Electrdnica y Sistemas, Universidad de La Laguna/38206 La Laguna, Tenerife/Espagne (1 aut., 2 aut., 3 aut., 7 aut.); Shanghai Institute of Ceramics, Chinese Academy of Sciences/Shanghai 200050/Chine (4 aut., 5 aut.); Departamento de Física Básica, Universidad de La Laguna/38206 La Laguna,Tenerife/Espagne (6 aut.); Departamento de Física de Materiales, Universidad Autónoma de Madrid/28049 Madrid/Espagne (1 aut., 2 aut.); Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas/28049 Madrid/Espagne (3 aut.)</AF>
<DT>Publication en série; Congrès; Niveau analytique</DT>
<SO>Journal of luminescence; ISSN 0022-2313; Coden JLUMA8; Pays-Bas; Da. 2008; Vol. 128; No. 5-6; Pp. 924-926; Bibl. 8 ref.</SO>
<LA>Anglais</LA>
<EA>The YAG nanopowders were prepared by a co-precipitation method using nitrate and ammonium hydrogen carbonate as raw materials. To obtain homogenous precipitate, reverse-strike (adding salt solutions to the precipitant solution) technique was adopted. Therefore, single (Tm<sup>3+</sup>
) and codoped (Tm<sup>3+</sup>
-Yb<sup>3+</sup>
) YAG nanopowders with a size between 40-90 nm have been obtained. Blue upconversion emission at around 480 nm has been found in YAG: Tm<sup>3+</sup>
nanopowders under excitation to the <sup>3</sup>
H<sub>4</sub>
level of Tm<sup>3</sup>
<sup>+</sup>
at around 800 nm. However, this upconversion emission in nanopowders codoped with Tm<sup>3+</sup>
-Yb<sup>3+</sup>
ions is increased by a factor of about 10. The analysis of the temporal evolution of the involved levels and the dependence of the upconversion intensity on the pump power at 800 nm allowed to distinguish the upconversion mechanism. In YAG: Tm<sup>3+</sup>
nanopowders the upconversion mechanism is due to excited state absorption processes. However, in the codoped samples, Yb<sup>3+</sup>
ions acts as the sensitizers; in consequence, the blue upconversion is strongly increased.</EA><CC>001B70H67B</CC>
<FD>Photoluminescence; Codopage; Coprécipitation; Dimension particule; Dépendance temps; Conversion fréquence; Etat excité; Addition ytterbium; Addition thulium; Etat impureté; Processus 2 photons; Grenat aluminium yttrium; Nanopoudre; Nanocristal</FD>
<ED>Photoluminescence; Codoping; Coprecipitation; Particle size; Time dependence; Frequency conversion; Excited states; Ytterbium additions; Thulium additions; Impurity states; Two-photon processes; YAG; Nanopowder; Nanocrystal</ED>
<SD>Codrogado; Conversión frecuencia; Nanopolvo; Nanocristal</SD>
<LO>INIST-14666.354000172659770680</LO>
<ID>08-0285317</ID>
</server>
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