Luminescence and non-radiative processes in lanthanide squarate hydrates

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorDe Mello Donegá, C.
dc.creatorRibeiro, Sidney José Lima
dc.creatorGonçalves, R. R.
dc.creatorBlasse, G.
dc.date2014-05-27T11:18:07Z
dc.date2016-10-25T18:14:01Z
dc.date2014-05-27T11:18:07Z
dc.date2016-10-25T18:14:01Z
dc.date1996-11-01
dc.date.accessioned2017-04-06T00:47:55Z
dc.date.available2017-04-06T00:47:55Z
dc.identifierJournal of Physics and Chemistry of Solids, v. 57, n. 11, p. 1727-1734, 1996.
dc.identifier0022-3697
dc.identifierhttp://hdl.handle.net/11449/64869
dc.identifierhttp://acervodigital.unesp.br/handle/11449/64869
dc.identifier10.1016/0022-3697(96)00032-7
dc.identifierWOS:A1996VU48100023
dc.identifier2-s2.0-0030284950
dc.identifierhttp://dx.doi.org/10.1016/0022-3697(96)00032-7
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/886646
dc.descriptionThe luminescence properties of solid hydrated lanthanide squarates (Ln2(C4O4)3(H2O) x; x = 8 or 13;Ln3+ = Gd, La, Eu, Tb, Pr) are reported for temperatures down to 4.2K. The luminescence of the squarate group is observed for the Gd3+ and La3+ compounds at low temperatures (below 150K). The Pr3+ compound does not show any emission at all, not even at 4.2K. This is ascribed to the quenching of the Pr3+ emission by multiphonon relaxation and/or concentration quenching. The quantum efficiencies of the 5D0 emission of Eu3+ and of the 5D4 emission of Tb3+ in these squarate complexes are strikingly different. Whereas the Tb3+ emission shows a temperature independent quantum efficiency of 50% upon ligand excitation, the Eu3+ emission is strongly quenched, showing a temperature dependent quantum efficiency of 0.8% at 4.2K upon ligand excitation. This quenching is ascribed to the low energy position of the charge-transfer state of Eu3+ in these compounds.
dc.languageeng
dc.relationJournal of Physics and Chemistry of Solids
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectA. inorganic compounds
dc.subjectD. luminescence
dc.subjectD. optical properties
dc.subjectCharge transfer
dc.subjectHydrates
dc.subjectIons
dc.subjectLuminescence
dc.subjectOptical properties
dc.subjectQuantum efficiency
dc.subjectQuenching
dc.subjectConcentration quenching
dc.subjectLanthanide squarate hydrates
dc.subjectLigand excitation
dc.subjectMultiphonon relaxation
dc.subjectNonradiative processes
dc.subjectRare earth compounds
dc.titleLuminescence and non-radiative processes in lanthanide squarate hydrates
dc.typeOtro


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