Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/19262
Full metadata record
DC FieldValueLanguage
dc.contributor.authorJulian-Lopez, Beatrizpt
dc.contributor.authorGonell, Franciscopt
dc.contributor.authorLima, Patricia P.pt
dc.contributor.authorFreitas, Vania T.pt
dc.contributor.authorAndre, Paulo S.pt
dc.contributor.authorCarlos, Luis D.pt
dc.contributor.authorFerreira, Rute A. S.pt
dc.date.accessioned2017-12-07T19:06:39Z-
dc.date.issued2015pt
dc.identifier.issn0957-4484pt
dc.identifier.urihttp://hdl.handle.net/10773/19262-
dc.description.abstractThis manuscript reports the synthesis and characterization of the first organic-inorganic hybrid material exhibiting efficient multimodal spectral converting properties. The nanocomposite, made of Er3+, Yb3+ codoped zirconia nanoparticles (NPs) entrapped in a di-ureasil d-U(600) hybrid matrix, is prepared by an easy two-step sol-gel synthesis leading to homogeneous and transparent materials that can be very easily processed as monolith or film. Extensive structural characterization reveals that zirconia nanocrystals of 10-20 nm in size are efficiently dispersed into the hybrid matrix and that the local structure of the di-ureasil is not affected by the presence of the NPs. A significant enhancement in the refractive index of the di-ureasil matrix with the incorporation of the ZrO2 nanocrystals is observed. The optical study demonstrates that luminescent properties of both constituents are perfectly preserved in the final hybrid. Thus, the material displays a white-light photoluminescence from the di-ureasil component upon excitation at UV/visible radiation and also intense green and red emissions from the Er3+ - and Yb3+ - doped NPs after NIR excitation. The dynamics of the optical processes were also studied as a function of the lanthanide content and the thickness of the films. Our results indicate that these luminescent hybrids represent a low-cost, environmentally friendly, size-controlled, easily processed and chemically stable alternative material to be used in light harvesting devices such as luminescent solar concentrators, optical fibres and sensors. Furthermore, this synthetic approach can be extended to a wide variety of luminescent NPs entrapped in hybrid matrices, thus leading to multifunctional and versatile materials for efficient tuneable nonlinear optical nanodevices.pt
dc.language.isoengpt
dc.publisherIOP PUBLISHING LTDpt
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147332/PTpt
dc.relationinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F87403%2F2012/PTpt
dc.rightsrestrictedAccesspor
dc.subjectUP-CONVERSION MECHANISMSpt
dc.subjectNEAR-INFRARED LIGHTpt
dc.subjectPLANAR WAVE-GUIDESpt
dc.subjectEMISSION RED-SHIFTpt
dc.subjectX-RAY-ABSORPTIONpt
dc.subjectGEL THIN-FILMSpt
dc.subjectUPCONVERTING NANOPARTICLESpt
dc.subjectORGANIC/INORGANIC HYBRIDSpt
dc.subjectZIRCONIA STABILIZATIONpt
dc.subjectER3+-ZRO2 NANOCRYSTALSpt
dc.titleEasily processable multimodal spectral converters based on metal oxide/organic-inorganic hybrid nanocompositespt
dc.typearticlept
dc.peerreviewedyespt
ua.distributioninternationalpt
degois.publication.issue40pt
degois.publication.titleNANOTECHNOLOGYpt
degois.publication.volume26pt
dc.date.embargo10000-01-01-
dc.relation.publisherversion10.1088/0957-4484/26/40/405601pt
dc.identifier.doi10.1088/0957-4484/26/40/405601pt
Appears in Collections:CICECO - Artigos



FacebookTwitterLinkedIn
Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.