Author, as appears in the article.: Slimi S; Loiko P; Bogdanov K; Volokitina A; Solé RM; Aguiló M; Díaz F; Ben Salem E; Mateos X

Department: Química Física i Inorgànica

URV's Author/s: 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: rosam.sole@urv.cat anna.volokitina@estudiants.urv.cat

Author identifier: 0000-0002-5769-4141 0000-0002-6091-6534

Record's date: 2023-02-23

Papper version: info:eu-repo/semantics/publishedVersion

Link to the original source: https://www.sciencedirect.com/science/article/pii/S0925838821045199

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Journal Of Alloys And Compounds. 896

APA: Slimi S; Loiko P; Bogdanov K; Volokitina A; Solé RM; Aguiló M; Díaz F; Ben Salem E; Mateos X (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(), -. DOI: 10.1016/j.jallcom.2021.163109

Article's DOI: 10.1016/j.jallcom.2021.163109

Entity: Universitat Rovira i Virgili

Journal publication year: 2022

Publication Type: Journal Publications