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The Effect of a Yb Co-Dopant on the Blue Upconversion and Thermoluminescent Emission of SrLaAlO4:Yb3+,Tm3+ Phosphors

dc.contributor.authorOshogwue Etafo, Nelson
dc.contributor.authorRodríguez García, Carlos Eduardo
dc.contributor.authorEsquivel Castro, Tzipatly Angelica
dc.contributor.authorLeón Madrid, Manuel I.
dc.contributor.authorGarza Santibañez, Alejandro
dc.contributor.authorOliva Uc, Jorge
dc.date.accessioned2024-05-30T21:28:16Z
dc.date.available2024-05-30T21:28:16Z
dc.date.issued2023
dc.identifier.citationEtafo, N.O.; Rodriguez Garcia, C.; Esquivel-Castro, T.A.; León-Madrid, M.I.; Santibañez, A.; Oliva, J. The Effect of a Yb Co-Dopant on the Blue Upconversion and Thermoluminescent Emission of SrLaAlO4:Yb3+,Tm3+ Phosphors. Coatings 2023, 13, 1003. https://doi.org/10.3390/coatings13061003
dc.identifier.urihttp://hdl.handle.net/11627/6534
dc.description.abstractIn this study, we described the structural, morphological, optical, photoluminescence, and thermoluminescence properties of SrLaAlO4:Tm3+,Yb3+ (SLAO:Tm,Yb) blue-emitting phosphors made by combustion synthesis and a post-annealing treatment at 1200 °C. The Yb co-dopant concentration was varied (1.0, 3.0, 5.0, and 6.0 mol%) while the Tm dopant concentration was fixed at 5 mol%. According to the X-ray diffraction patterns, all the samples presented the pure tetragonal phase of SrLaAlO4. Scanning electron microscopy analysis showed that the SLAO powders had morphologies of irregular or bar grains with average sizes in the range of 0.5–1.07 µm. Photoluminescence emission under 980 nm excitation showed an intense blue emission peak at 481 nm. The phosphors also emitted red light at 654 nm and a prominent NIR emission at 801 nm. All those emissions correspond to 1G4 ? 3H6, 1G4 ? 3H4 and 3H4 ? 3H6 transitions of Tm3+. The SLAO:Tm,Yb phosphors synthesized with 3.0 mol.% of the Yb co-dopant showed the highest emission intensity in the visible/near-infrared (NIR) range (400–800 nm), and its CIE coordinates corresponded to the blue color (0.19368, 0.15826). Additionally, thermoluminescence emissions were recorded for the SLAO:Tm,Yb phosphors. The samples were previously irradiated with UV wavelengths of 265 nm, 365 nm, and 385 nm prior to the thermoluminescent measurements. After this, the kinetic parameters such as frequency factors, activation energy (E), and order of kinetics were calculated using the Chen method. The thermoluminiscent emissions demonstrated that the SLAO:Yb,Tm phosphors can be used for UV dosimetry.
dc.publisherMDPI
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectCombustion synthesis
dc.subjectPhosphor
dc.subjectStrontium lanthanum aluminate
dc.subjectYtterbium
dc.subjectThulium
dc.subjectPhotoluminescence
dc.subjectThermoluminescence
dc.subject.classificationFÍSICA
dc.titleThe Effect of a Yb Co-Dopant on the Blue Upconversion and Thermoluminescent Emission of SrLaAlO4:Yb3+,Tm3+ Phosphors
dc.typearticle
dc.identifier.doihttps://doi.org/10.3390/coatings13061003
dc.rights.accessAcceso Abierto


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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
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