Photoluminescence properties and structural analysis of Tb3+-doped K3Gd (BO2)6: A first study on negative thermal quenching

Basit Öğe Kaydı
dc.contributor.authorSouadi, G.
dc.contributor.authorMadkhli, A. Y.
dc.contributor.authorKaynar, U. H.
dc.contributor.authorGok, C.
dc.contributor.authorAydin, H.
dc.contributor.authorCoban, M. B.
dc.contributor.authorKaynar, S. Cam
dc.date.accessioned2025-03-20T09:51:09Z
dc.date.available2025-03-20T09:51:09Z
dc.date.issued2025
dc.departmentİzmir Bakırçay Üniversitesi
dc.description.abstractIn this study, Tb3+-doped K3Gd(BO2)6 phosphors were synthesized using the microwave-assisted sol-gel method to explore their photoluminescence (PL) properties and thermal stability. XRD and Rietveld refinement confirmed the incorporation of Tb3+ions, without secondary phases. PL analysis revealed a strong green emission near 542 nm, attributed to the 5 D 4 -> 7 F 5 transition of Tb3+ions. An optimal Tb3+concentration of 3 wt% was identified, beyond which concentration quenching significantly reduced luminescence intensity. Radiative energy transfer, occurring via reabsorption, was observed at lower concentrations, facilitating efficient energy migration. Conversely, at higher concentrations, non-radiative processes such as cross-relaxation dominated. Remarkably, negative thermal quenching (NTQ) was observed up to 470 K, with an activation energy of 0.96 eV. Additionally, Na+ co- doping introduced lattice distortions that enhanced energy transfer between Tb3+ions and improved luminescence efficiency. The chromaticity diagram highlighted a shift towards the yellow-green region with increasing the Tb3+concentration, demonstrating tunable emission properties for solid-state lighting applications.
dc.description.sponsorshipTurkish Scientific Research Council [223M036, TUBITAK-1001]; Izmir Bakimath;ray University Scientific Research Projects Coordination Unit [HZP.2024.008]
dc.description.sponsorshipThis study was supported by the Turkish Scientific Research Council with the project numbered 223M036 within the scope of theTUBITAK-1001 project. This work was also supported by Izmir Bak & imath;rcay University Scientific Research Projects Coordination Unit, under grant number HZP.2024.008.
dc.identifier.doi10.1016/j.jallcom.2024.178147
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669
dc.identifier.scopus2-s2.0-85212313791
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2024.178147
dc.identifier.urihttps://hdl.handle.net/20.500.14034/2445
dc.identifier.volume1010
dc.identifier.wosWOS:001391332400001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Science Sa
dc.relation.ispartofJournal of Alloys and Compounds
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250319
dc.subjectTb
dc.subjectXRD
dc.subjectPhotoluminescence
dc.subjectNegative thermal quenching
dc.subjectK3Gd(BO2)6
dc.titlePhotoluminescence properties and structural analysis of Tb3+-doped K3Gd (BO2)6: A first study on negative thermal quenching
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu