Author, as appears in the article.: Slimi, Sami; Loiko, Pavel; Bogdanov, Kirill; Volokitina, Anna; Sole, Rosa Maria; Aguilo, Magdalena; Diaz, Francesc; Ben Salem, Ezzedine; Mateos, Xavier
Department: Química Física i Inorgànica
URV's Author/s: Aguiló Díaz, Magdalena / Díaz González, Francisco Manuel / Mateos Ferré, Xavier / Slimi, Sami / Solé Cartañà, Rosa Maria / Volokitina, Anna
Keywords: Yellow phosphor Satisfactory thermal-properties Orthosilicate oxyapatite Luminescence Dysprosium ions Crystal structure yellow phosphor temperature rare-earth quenching behavior photoluminescence properties luminescence eu3+ energy-transfer electrolyte dysprosium ions crystal-structure crystal structure conductivity
Abstract: A series of Dy3+-doped sodium lanthanum orthosilicate oxyapatites, NaLa9?xDyx(SiO4)6O2 (NLSO:xDy, x = 0–0.3), were synthesized by the solid-state reaction method at 1100 °C, with the aim of developing yellow emitting phosphors for applications in w-LEDs. Their crystal structure, morphology and particle size distribution, electronic structure, Raman spectra, concentration- and temperature-dependent luminescent properties were investigated for the first time. The crystal structure was refined by the Rietveld method. Undoped NLSO is hexagonal (space group P63/m – C26h) with lattice constants a = b = 9.6917(3) Å and c = 7.1836(4) Å. It is shown that Dy3+ ions substitute for the La3+ ones in two types of sites with C3 and Cs point symmetries. The first-principle calculations for undoped NLSO revealed an indirect bandgap of 5.06 eV. The NLSO:0.2Dy phosphor exhibited intense yellow emission with CIE 1931 chromaticity coordinates of (0.469, 0.495) and a correlated color temperature of 3150 K owing to the hypersensitive electric-dipole transition 4F9/2?6H13/2 (571 nm) dominating in the luminescence spectrum. Excellent thermal stability was found for this apatite phosphor (the activation energy is 0.23 ± 0.02 eV). © 2021 The Authors
Thematic Areas: Química Planejamento urbano e regional / demografia Odontología Metals and alloys Metallurgy & metallurgical engineering Mechanics of materials Mechanical engineering Materials science, multidisciplinary Materials science Materials chemistry Materiais Matemática / probabilidade e estatística Interdisciplinar Geociências Farmacia Ensino Engenharias iv Engenharias iii Engenharias ii Engenharias i Ciências biológicas i Ciências ambientais Ciências agrárias i Chemistry, physical Biotecnología Astronomia / física Antropologia / arqueologia Administração pública e de empresas, ciências contábeis e turismo
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: anna.volokitina@estudiants.urv.cat sami.slimi@estudiants.urv.cat sami.slimi@estudiants.urv.cat magdalena.aguilo@urv.cat rosam.sole@urv.cat xavier.mateos@urv.cat f.diaz@urv.cat
Author identifier: 0000-0002-6091-6534 0000-0001-6130-9579 0000-0002-5769-4141 0000-0003-1940-1990 0000-0003-4581-4967
Record's date: 2024-10-19
Papper version: info:eu-repo/semantics/publishedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Journal Of Alloys And Compounds. 896 163109-
APA: Slimi, Sami; Loiko, Pavel; Bogdanov, Kirill; Volokitina, Anna; Sole, Rosa Maria; Aguilo, Magdalena; Diaz, Francesc; Ben Salem, Ezzedine; Mateos, Xavie (2022). Structure and luminescent properties of Dy3+ activated NaLa9(SiO4)6O2 yellow-emitting phosphors for application in white LEDs. Journal Of Alloys And Compounds, 896(), 163109-. DOI: 10.1016/j.jallcom.2021.163109
Entity: Universitat Rovira i Virgili
Journal publication year: 2022
Publication Type: Journal Publications
Repositori URV