Glowing synthetic chlorohectorite: The luminescent features of a trioctahedral clay mineral

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dc.contributor.authorSantos H.S.
dc.contributor.authorCarvalho J.M.
dc.contributor.authorViinikanoja A.
dc.contributor.authorHyppanen I.
dc.contributor.authorLaihinen T.
dc.contributor.authorRomani E.C.
dc.contributor.authorLarrude D.G.
dc.contributor.authorTuominen M.
dc.contributor.authorLaukkanen P.
dc.contributor.authorSwart H.C.
dc.contributor.authorBrito H.F.
dc.contributor.authorHolsa J.
dc.contributor.authorLastusaari M.
dc.date.accessioned2024-03-13T00:00:28Z
dc.date.available2024-03-13T00:00:28Z
dc.date.issued2017
dc.description.abstract© 2017 Elsevier B.V.Clay minerals are versatile materials with numerous industrial applications. Their unique layered structure can act as a host for many optically active species. The synthesis and luminescence properties of chlorohectorite clays are now reported for the first time. The synthesized clays are composed of quasi-circular nanoparticles with diameters around 20–30 nm showing blue/green emission and persistent luminescence with a duration of ca. 5 s. The luminescence features are associated with titanium impurities in the chlorohectorite structure. It is shown that Ti can act as activator ion even at low concentrations: the XRF and ICP-MS measurements of the chlorohectorite materials indicate a Ti concentration around 60 ppm originating from the precursors. The XPS measurements of the clay materials showed the Ti 2p3/2 signals at 457.8 and 458.9 eV associated with Ti3+ and TiIV, respectively. The excitation spectra confirm Ti3+ as the luminescent center in the chlorohectorites through the bands at 287 and 370 nm, related to the e−(O2−(2p))→TiIV charge transfer and the electronic transitions from the t2g to eg levels of Ti3+, respectively. The persistent luminescence properties are due to structural defects common for layered silicates.
dc.description.firstpage567
dc.description.lastpage573
dc.description.volume192
dc.identifier.doi10.1016/j.jlumin.2017.07.017
dc.identifier.issn0022-2313
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35677
dc.relation.ispartofJournal of Luminescence
dc.rightsAcesso Restrito
dc.subject.otherlanguageChlorohectorites
dc.subject.otherlanguageEmission
dc.subject.otherlanguageLayered silicates
dc.subject.otherlanguagePersistent luminescence
dc.subject.otherlanguageTitanium
dc.subject.otherlanguageTraps
dc.titleGlowing synthetic chlorohectorite: The luminescent features of a trioctahedral clay mineral
dc.typeArtigo
local.scopus.citations5
local.scopus.eid2-s2.0-85026349963
local.scopus.subjectChlorohectorites
local.scopus.subjectElectronic transition
local.scopus.subjectExcitation spectrum
local.scopus.subjectLayered silicate
local.scopus.subjectLuminescence properties
local.scopus.subjectLuminescent centers
local.scopus.subjectPersistent luminescence
local.scopus.subjectTraps
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85026349963&origin=inward
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