ThuliumV1, Main, Exploration, bibRecord, 000400

Er3+/Tm3+ codoped tellurite glass for blue upconversion-Structure, thermal stability and spectroscopic properties

Identifieur interne : 000400 ( Main/Exploration ); précédent : 000399; suivant : 000401

Er3+/Tm3+ codoped tellurite glass for blue upconversion-Structure, thermal stability and spectroscopic properties

Auteurs : DANDAN YIN [République populaire de Chine] ; YAWEI QI [République populaire de Chine] ; SHENGXI PENG [République populaire de Chine] ; SHICHAO ZHENG [République populaire de Chine] ; FEN CHEN [République populaire de Chine] ; GAOBO YANG [République populaire de Chine] ; XUNSI WANG [République populaire de Chine] ; YAXUN ZHOU [République populaire de Chine]

Source :

Journal of luminescence [ 0022-2313 ] ; 2014.

RBID : Pascal:14-0191327

Descripteurs français

Pascal (Inist)
- Codopage, Conversion fréquence, Stabilité structurale, Stabilité thermique, Photoluminescence, Spectre absorption, Oxyde de tungstène, Oxyde de tellure, Oxyde d'erbium, Oxyde de thulium, Spectre visible, Fluorescence, Transfert énergie, Nitrure de calcium, Phonon, WO3, TeO2, Er2O3, Verre de tellurite.

English descriptors

KwdEn :
- Absorption spectra, Calcium nitride, Codoping, Energy transfer, Erbium oxides, Fluorescence, Frequency conversion, Phonons, Photoluminescence, Structure stability, Tellurite glass, Tellurium oxide, Thermal stability, Thulium oxides, Tungsten oxide, Visible spectra.

Abstract

The Er³⁺/Tm³⁺ codoped WO₃ modified tellurite glasses with molar composition of (75-x)TeO₂-20ZnO- 5Na₂O-xWO₃-0.2 wt%Er₂O₃-0.8 wt%Tm₂O₃ (x=0,4,8,12 mol%) were prepared to realize the blue upconversion emission. The absorption spectra, visible upconversion spectra and 1.53 μm band fluorescence spectra of glass samples were measured, together with the quantitative calculations of relevant spectroscopic parameters of Tm³⁺ and energy transfer micro-parameters between Er³⁺ and Tm³⁺ ions, to evaluate the effects of WO₃ oxide on the spectroscopic properties of Er³⁺-Tm³⁺ ions. It was found that the introduction of WO₃ oxide can further improve the blue upconversion emission of Tm³⁺ through an enhanced phonon-assisted energy transfer process. Meanwhile, with the increase of WO₃ amount, the thermal stability of glass hosts, characterized by the difference between the glass crystallization onset temperature and the transition temperature which obtained from the measured differential scanning calorimeter (DSC) curves, increased and no obvious crystallization peak was detected when the WO₃ amount increased to 12 mol%. Furthermore, the glass structure was briefly analyzed with the obtained Judd-Ofelt intensity parameters, the measured Raman spectra and X-ray diffraction (XRD) curves. The present results demonstrate the feasibility of realizing strong blue upconversion emission by introducing WO₃ oxide with high phonon energy into the Er³⁺/Tm³⁺ codoped tellurite glass and also indicate its potential application as a glass host applied for the blue upconversion lasers.

Affiliations:

République populaire de Chine

Links toward previous steps (curation, corpus...)

to stream Pascal, to step Corpus: 000036
to stream Pascal, to step Curation: 000036
to stream Pascal, to step Checkpoint: 000029
to stream Main, to step Merge: 000400
to stream Main, to step Curation: 000400

Le document en format XML

<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Er3<sup>+</sup>
/Tm<sup>3+</sup>
 codoped tellurite glass for blue upconversion-Structure, thermal stability and spectroscopic properties</title>
<author><name sortKey="Dandan Yin" sort="Dandan Yin" uniqKey="Dandan Yin" last="Dandan Yin">DANDAN YIN</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Yawei Qi" sort="Yawei Qi" uniqKey="Yawei Qi" last="Yawei Qi">YAWEI QI</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Shengxi Peng" sort="Shengxi Peng" uniqKey="Shengxi Peng" last="Shengxi Peng">SHENGXI PENG</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Shichao Zheng" sort="Shichao Zheng" uniqKey="Shichao Zheng" last="Shichao Zheng">SHICHAO ZHENG</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Fen Chen" sort="Fen Chen" uniqKey="Fen Chen" last="Fen Chen">FEN CHEN</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratory of Infrared Materials and Devices, The Advanced Technology Research Institute, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Gaobo Yang" sort="Gaobo Yang" uniqKey="Gaobo Yang" last="Gaobo Yang">GAOBO YANG</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratory of Infrared Materials and Devices, The Advanced Technology Research Institute, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Xunsi Wang" sort="Xunsi Wang" uniqKey="Xunsi Wang" last="Xunsi Wang">XUNSI WANG</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratory of Infrared Materials and Devices, The Advanced Technology Research Institute, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Yaxun Zhou" sort="Yaxun Zhou" uniqKey="Yaxun Zhou" last="Yaxun Zhou">YAXUN ZHOU</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">INIST</idno>
<idno type="inist">14-0191327</idno>
<date when="2014">2014</date>
<idno type="stanalyst">PASCAL 14-0191327 INIST</idno>
<idno type="RBID">Pascal:14-0191327</idno>
<idno type="wicri:Area/Pascal/Corpus">000036</idno>
<idno type="wicri:Area/Pascal/Curation">000036</idno>
<idno type="wicri:Area/Pascal/Checkpoint">000029</idno>
<idno type="wicri:explorRef" wicri:stream="Pascal" wicri:step="Checkpoint">000029</idno>
<idno type="wicri:Area/Main/Merge">000400</idno>
<idno type="wicri:Area/Main/Curation">000400</idno>
<idno type="wicri:Area/Main/Exploration">000400</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Er3<sup>+</sup>
/Tm<sup>3+</sup>
 codoped tellurite glass for blue upconversion-Structure, thermal stability and spectroscopic properties</title>
<author><name sortKey="Dandan Yin" sort="Dandan Yin" uniqKey="Dandan Yin" last="Dandan Yin">DANDAN YIN</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Yawei Qi" sort="Yawei Qi" uniqKey="Yawei Qi" last="Yawei Qi">YAWEI QI</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Shengxi Peng" sort="Shengxi Peng" uniqKey="Shengxi Peng" last="Shengxi Peng">SHENGXI PENG</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Shichao Zheng" sort="Shichao Zheng" uniqKey="Shichao Zheng" last="Shichao Zheng">SHICHAO ZHENG</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Fen Chen" sort="Fen Chen" uniqKey="Fen Chen" last="Fen Chen">FEN CHEN</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratory of Infrared Materials and Devices, The Advanced Technology Research Institute, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Gaobo Yang" sort="Gaobo Yang" uniqKey="Gaobo Yang" last="Gaobo Yang">GAOBO YANG</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratory of Infrared Materials and Devices, The Advanced Technology Research Institute, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Xunsi Wang" sort="Xunsi Wang" uniqKey="Xunsi Wang" last="Xunsi Wang">XUNSI WANG</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratory of Infrared Materials and Devices, The Advanced Technology Research Institute, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>7 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Yaxun Zhou" sort="Yaxun Zhou" uniqKey="Yaxun Zhou" last="Yaxun Zhou">YAXUN ZHOU</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>College of Information Science and Engineering, Ningbo University</s1>
<s2>Zhejiang 315211</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>République populaire de Chine</country>
<wicri:noRegion>Zhejiang 315211</wicri:noRegion>
</affiliation>
</author>
</analytic>
<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="2014">2014</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
<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>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption spectra</term>
<term>Calcium nitride</term>
<term>Codoping</term>
<term>Energy transfer</term>
<term>Erbium oxides</term>
<term>Fluorescence</term>
<term>Frequency conversion</term>
<term>Phonons</term>
<term>Photoluminescence</term>
<term>Structure stability</term>
<term>Tellurite glass</term>
<term>Tellurium oxide</term>
<term>Thermal stability</term>
<term>Thulium oxides</term>
<term>Tungsten oxide</term>
<term>Visible spectra</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Codopage</term>
<term>Conversion fréquence</term>
<term>Stabilité structurale</term>
<term>Stabilité thermique</term>
<term>Photoluminescence</term>
<term>Spectre absorption</term>
<term>Oxyde de tungstène</term>
<term>Oxyde de tellure</term>
<term>Oxyde d'erbium</term>
<term>Oxyde de thulium</term>
<term>Spectre visible</term>
<term>Fluorescence</term>
<term>Transfert énergie</term>
<term>Nitrure de calcium</term>
<term>Phonon</term>
<term>WO3</term>
<term>TeO2</term>
<term>Er2O3</term>
<term>Verre de tellurite</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">The Er<sup>3+</sup>
/Tm<sup>3+</sup>
 codoped WO<sub>3</sub>
 modified tellurite glasses with molar composition of (75-x)TeO<sub>2</sub>
-20ZnO- 5Na<sub>2</sub>
O-xWO<sub>3</sub>
-0.2 wt%Er<sub>2</sub>
O<sub>3</sub>
-0.8 wt%Tm<sub>2</sub>
O<sub>3</sub>
 (x=0,4,8,12 mol%) were prepared to realize the blue upconversion emission. The absorption spectra, visible upconversion spectra and 1.53 μm band fluorescence spectra of glass samples were measured, together with the quantitative calculations of relevant spectroscopic parameters of Tm<sup>3+</sup>
 and energy transfer micro-parameters between Er<sup>3+</sup>
 and Tm<sup>3+</sup>
 ions, to evaluate the effects of WO<sub>3</sub>
 oxide on the spectroscopic properties of Er<sup>3+</sup>
-Tm<sup>3+</sup>
 ions. It was found that the introduction of WO<sub>3</sub>
 oxide can further improve the blue upconversion emission of Tm<sup>3+</sup>
 through an enhanced phonon-assisted energy transfer process. Meanwhile, with the increase of WO<sub>3</sub>
 amount, the thermal stability of glass hosts, characterized by the difference between the glass crystallization onset temperature and the transition temperature which obtained from the measured differential scanning calorimeter (DSC) curves, increased and no obvious crystallization peak was detected when the WO<sub>3</sub>
 amount increased to 12 mol%. Furthermore, the glass structure was briefly analyzed with the obtained Judd-Ofelt intensity parameters, the measured Raman spectra and X-ray diffraction (XRD) curves. The present results demonstrate the feasibility of realizing strong blue upconversion emission by introducing WO<sub>3</sub>
 oxide with high phonon energy into the Er<sup>3+</sup>
/Tm<sup>3+</sup>
 codoped tellurite glass and also indicate its potential application as a glass host applied for the blue upconversion lasers.</div>
</front>
</TEI>
<affiliations><list><country><li>République populaire de Chine</li>
</country>
</list>
<tree><country name="République populaire de Chine"><noRegion><name sortKey="Dandan Yin" sort="Dandan Yin" uniqKey="Dandan Yin" last="Dandan Yin">DANDAN YIN</name>
</noRegion>
<name sortKey="Fen Chen" sort="Fen Chen" uniqKey="Fen Chen" last="Fen Chen">FEN CHEN</name>
<name sortKey="Gaobo Yang" sort="Gaobo Yang" uniqKey="Gaobo Yang" last="Gaobo Yang">GAOBO YANG</name>
<name sortKey="Shengxi Peng" sort="Shengxi Peng" uniqKey="Shengxi Peng" last="Shengxi Peng">SHENGXI PENG</name>
<name sortKey="Shichao Zheng" sort="Shichao Zheng" uniqKey="Shichao Zheng" last="Shichao Zheng">SHICHAO ZHENG</name>
<name sortKey="Xunsi Wang" sort="Xunsi Wang" uniqKey="Xunsi Wang" last="Xunsi Wang">XUNSI WANG</name>
<name sortKey="Xunsi Wang" sort="Xunsi Wang" uniqKey="Xunsi Wang" last="Xunsi Wang">XUNSI WANG</name>
<name sortKey="Yawei Qi" sort="Yawei Qi" uniqKey="Yawei Qi" last="Yawei Qi">YAWEI QI</name>
<name sortKey="Yaxun Zhou" sort="Yaxun Zhou" uniqKey="Yaxun Zhou" last="Yaxun Zhou">YAXUN ZHOU</name>
</country>
</tree>
</affiliations>
</record>

Pour manipuler ce document sous Unix (Dilib)

EXPLOR_STEP=$WICRI_ROOT/Wicri/Terre/explor/ThuliumV1/Data/Main/Exploration

HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000400 | SxmlIndent | more

HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000400 | SxmlIndent | more

Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Wicri/Terre
   |area=    ThuliumV1
   |flux=    Main
   |étape=   Exploration
   |type=    RBID
   |clé=     Pascal:14-0191327
   |texte=   Er3+/Tm3+ codoped tellurite glass for blue upconversion-Structure, thermal stability and spectroscopic properties
}}

This area was generated with Dilib version V0.6.21.
Data generation: Thu May 12 08:27:09 2016. Site generation: Thu Mar 7 22:33:44 2024

	Serveur d'exploration sur le thulium
	Attention, ce site est en cours de développement ! Attention, site généré par des moyens informatiques à partir de corpus bruts. Les informations ne sont donc pas validées.

Serveur d'exploration sur le thulium

Er3+/Tm3+ codoped tellurite glass for blue upconversion-Structure, thermal stability and spectroscopic properties

Er3+/Tm3+ codoped tellurite glass for blue upconversion-Structure, thermal stability and spectroscopic properties

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri