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dc.contributor.authorXiao, Zhisong-
dc.contributor.authorSerna, Rosalía-
dc.contributor.authorXu, Fei-
dc.contributor.authorAfonso, Carmen N.-
dc.date.accessioned2012-07-17T08:27:10Z-
dc.date.available2012-07-17T08:27:10Z-
dc.date.issued2008-03-14-
dc.identifier.citationOptics Letters, 33(6):608-610(2008)es_ES
dc.identifier.issn0146-9592-
dc.identifier.urihttp://hdl.handle.net/10261/53395-
dc.description3 pags. ; 2 figs.es_ES
dc.description.abstractNanostructured amorphous Al oxide (a-Al₂O₃) thin films doped with Tm³+ were synthesized by alternate pulsed laser deposition. The Tm³+ ions have been deposited in layers with in-depth separation ranging from 0.75 to 6nm . The films show two broad emission bands originated from the Tm³+ ³H₄ → ³F₄ and ³F₄ → ³H₆ transitions. Their intensity increases at a similar rate and the lifetimes are not modified as the layer separation decreases down to 1.5nm , suggesting that there is no concentration quenching. At the critical value of 1.5nm the onset of Tm³+ – Tm³+ energy transfer is evidenced by a sharp decrease of the emission intensity and lifetime. Below this critical value, the rate at which the intensity increases for the ³F₄ → ³H₆ transition is much higher than that for the ³H₄ → ³F₄ transition, evidencing quenching of the ³H₄ → ³F₄ transition through a cross-relaxation mechanism. The control of the Tm³+ ions in the nanometer scale allows evidencing the onset of energy transfer processes among ions and offers a route to optimize compact photonic gain integrated devices.es_ES
dc.description.sponsorshipThis work was supported by Comisión Interministerial de Ciencia y Tecnología (CICYT) (Spain) under project TEC2006-04538-MIC, and by the National Natural Science Foundation of China (grant 10604003), and Beijing Nova Program (grant 2006B15) from Beijing Municipal Science and Technology Commission.es_ES
dc.language.isoenges_ES
dc.publisherOptical Society of Americaes_ES
dc.rightsopenAccesses_ES
dc.subject[OCIS] ntegrated optics : Integrated optics materialses_ES
dc.subject[OCIS] Materials : Rare-earth-doped materialses_ES
dc.subject[OCIS] Optoelectronics : Photoluminescencees_ES
dc.subject[OCIS] Spectroscopy : Spectroscopy, fluorescence and luminescencees_ES
dc.titleCritical separation for efficient Tm³+–Tm³+ energy transfer evidenced in nanostructured Tm³+:Al₂O₃ thin filmses_ES
dc.typeartículoes_ES
dc.identifier.doi10.1364/OL.33.000608-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.1364/OL.33.000608es_ES
dc.identifier.e-issn1539-4794-
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