Doping Sm3+ into ZnB2O4 phosphors and their structural and cathodoluminescence properties

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dc.contributor.authorKucuk N.
dc.contributor.authorBulcar K.
dc.contributor.authorDogan T.
dc.contributor.authorGarcia Guinea J.
dc.contributor.authorPortakal Z.G.
dc.contributor.authorKarabulut Y.
dc.contributor.authorAyvacikli M.
dc.contributor.authorCanimoglu A.
dc.contributor.authorTopaksu M.
dc.contributor.authorCan N.
dc.date.accessioned2024-07-22T08:09:38Z
dc.date.available2024-07-22T08:09:38Z
dc.date.issued2018
dc.description.abstractIn this study, ZnB2O4:xSm3+ (0.01 ≤ x ≤ 0.05 mol) powder phosphors have been synthesized by low temperature chemical synthesis method. The structure and morphological observation of the phosphor samples were systematically monitored by X-ray powder diffraction (XRD) and environmental scanning electron microscope (ESEM) coupled to an energy dispersive X-ray spectrometer (EDS). The all diffraction peaks are well assigned to standard data card (PDF#39-1126). Emission properties of the samples were explored using light emission induced by an electron beam (i.e cathodoluminescence, CL) at room temperature (RT). When excited with electron beam, CL spectral measurements of scrutinized phosphors exhibit orange-red luminescence at 572 nm, 606 nm and 658 nm due to various transition from ground state to 6H5/2,6H7/2 and 4G5/2 states, respectively. The transition 4G5/2 → 6H7/2 located at 606 nm can occur as hypersensitive transition having the selection rule ΔJ = ±1. The observed peaks are in the region of yellow reddish light of Sm3+. Experimental results verify that the optimum Sm3+ content in terms of intense luminescence for this series of phosphors was 2%. Beyond 2% of Sm3+ ions concentration, luminescence quenching occurs due to an enhanced probability of the energy transfer from one Sm3+ to another that matches in energy via cross-relaxation and dipole-dipole interactions according to Dexter theory. A suitable energy transfer model between two adjacent Sm3+ ions in the ZnB2O4 phosphors was accomplished by the electric dipole-dipole interaction. The critical transfer distance (Rc) for non-radiative energy transfer was found to be 21.52 Å at 2 mol % Sm3+ doped ZnB2O4. Additionally, thermoluminescence (TL) glow curves of undoped and Sm activated ZnB2O4 under beta irradiation of 10 Gy are also discussed here. © 2018 Elsevier B.V.
dc.identifier.DOI-ID10.1016/j.jallcom.2018.03.153
dc.identifier.issn09258388
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/14885
dc.language.isoEnglish
dc.publisherElsevier Ltd
dc.subjectCathodoluminescence
dc.subjectDiffraction
dc.subjectDipole moment
dc.subjectElectric dipole moments
dc.subjectElectron beams
dc.subjectEnergy transfer
dc.subjectExcited states
dc.subjectGround state
dc.subjectLight
dc.subjectPhosphors
dc.subjectProbability density function
dc.subjectScanning electron microscopy
dc.subjectSpectrometers
dc.subjectTemperature
dc.subjectThermoluminescence
dc.subjectX ray powder diffraction
dc.subjectX ray spectrometers
dc.subjectX rays
dc.subjectDipole dipole interactions
dc.subjectElectric dipole-dipole interactions
dc.subjectEnergy dispersive x-ray spectrometers
dc.subjectEnvironmental scanning electron microscopes
dc.subjectESEM
dc.subjectMorphological observations
dc.subjectNonradiative energy transfer
dc.subjectZnB2O4:Sm^3+
dc.subjectZinc compounds
dc.titleDoping Sm3+ into ZnB2O4 phosphors and their structural and cathodoluminescence properties
dc.typeArticle

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