Mechanism of phosphorescence appropriate for the long-lasting phosphors Eu2+-doped SrAl2O4 with codopants Dy3+ and B3+
| hal.structure.identifier | Institut des Matériaux Jean Rouxel [IMN] | |
| dc.contributor.author | CLABAU, Frédéric | |
| hal.structure.identifier | Institut des Matériaux Jean Rouxel [IMN] | |
| dc.contributor.author | ROCQUEFELTE, Xavier | |
| hal.structure.identifier | Institut des Matériaux Jean Rouxel [IMN] | |
| dc.contributor.author | JOBIC, Stéphane | |
| hal.structure.identifier | Institut des Matériaux Jean Rouxel [IMN] | |
| dc.contributor.author | DENIARD, Philippe | |
| hal.structure.identifier | Department of Chemistry, North Carolina Raleigh | |
| dc.contributor.author | WHANGBO, Myung-Hwan | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GARCIA, Alain | |
| hal.structure.identifier | Centre de Recherches d'Aubervilliers | |
| dc.contributor.author | LE MERCIER, Thierry | |
| dc.date.issued | 2005 | |
| dc.identifier.issn | 0897-4756 | |
| dc.description.abstractEn | The existing mechanisms proposed to explain the phosphorescence of SrAl2O4:Eu2+,Dy3+ and related phosphors were found to be inconsistent with a number of important experimental and theoretical observations. We formulated a new mechanism of phosphorescence on the basis of the facts that the d orbitals of Eu2+ are located near the conduction band bottom of SrAl2O4, that the Eu2+ concentration decreases during UV excitation, and that trace amounts of Eu3+ are always present in these phosphors. In our mechanism, some Eu2+ ions are oxidized to Eu3+ under UV, and the released electrons are trapped at the oxygen vacancy levels located in the vicinity of the photogenerated Eu3+ cations. The phosphorescence arises from the recombination of these trapped electrons around the photogenerated Eu3+ sites with emission at 520 nm. The codopant Dy3+ enhances the phosphorescence by increasing the number and the depth of electron traps, and the codopant B3+ enhances the phosphorescence by increasing the depth of electron traps. We also probed the origin of another emission at 450 nm of SrAl2O4:Eu2+ that occurs at low temperatures. Our analysis indicates that this emission is caused by a charge transfer from oxygen to Eu3+ cations and is associated with a hole trapping. | |
| dc.language.iso | en | |
| dc.publisher | American Chemical Society | |
| dc.subject.en | Luminescent properties | |
| dc.subject.en | Persistent luminescent | |
| dc.subject.en | Strontium aluminate | |
| dc.subject.en | Yttrium oxysulfide | |
| dc.subject.en | Gel method | |
| dc.subject.en | Eu2+ | |
| dc.subject.en | Afterglow | |
| dc.subject.en | Crystals | |
| dc.subject.en | Red | |
| dc.subject.en | Orange | |
| dc.title.en | Mechanism of phosphorescence appropriate for the long-lasting phosphors Eu2+-doped SrAl2O4 with codopants Dy3+ and B3+ | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1021/cm050763r | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Chemistry of Materials | |
| bordeaux.page | 3904-3912 | |
| bordeaux.volume | 17 | |
| bordeaux.issue | 15 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00019255 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00019255v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Chemistry%20of%20Materials&rft.date=2005&rft.volume=17&rft.issue=15&rft.spage=3904-3912&rft.epage=3904-3912&rft.eissn=0897-4756&rft.issn=0897-4756&rft.au=CLABAU,%20Fr%C3%A9d%C3%A9ric&ROCQUEFELTE,%20Xavier&JOBIC,%20St%C3%A9phane&DENIARD,%20Philippe&WHANGBO,%20Myung-Hwan&rft.genre=article |
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