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Structure and luminescence properties of Dy3+ doped quaternary tungstate Li3Ba2Gd3(WO4)8 for application in wLEDs

Douzi, Abir; Slimi, Sami; Madirov, Eduard ORCID iD icon 1; Turshatov, Andrey 1; Richards, Bryce S. S. ORCID iD icon 1; Solé, Rosa Maria; Aguiló, Magdalena; Díaz, Francesc; Ben Salem, Ezzedine; Mateos, Xavier
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)

Abstract:

Quaternary tungstates with the composition Li3Ba2Gd3(WO4)8 doped with different concentrations of Dy3+ (from 0.5 to 10 at%) were prepared by the solid-state reaction method at 900 °C. Their structural, spectroscopic and optical properties were studied systematically in this work. X-ray diffraction analysis confirmed the crystallization of Li3Ba2Gd3(WO4)8 to have a monoclinic structure (sp. gr. C2/c); the lattice constants for 1 at% doping concentration of Dy3+ are a = 5.2126(2) Å, b = 12.7382(1) Å, c = 19.1884(3) Å, Vcalc = 1273,40(4) Å3 and β = a × c = 91.890(9)°. The first principles calculations for the undoped crystal revealed a direct bandgap of 2.45 eV, which is very close to the experimental one. The identified broad, and strong excitation peak at 450 nm indicates that Li3Ba2Gd3(WO4)8:Dy3+ phosphors are suitable to be pumped by a blue laser diode (LD). Under excitation at 445 nm, the phosphor showed a stronger luminescence peak at 575 nm which corresponds to the Dy3+:4F9/26H13/2 transition, and three weaker emissions peaks at 477, 661, and 750 nm. ... mehr

Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2023
Sprache Englisch
Identifikator ISSN: 2046-2069
KITopen-ID: 1000162432
HGF-Programm 38.01.05 (POF IV, LK 01) Simulations, Theory, Optics and Analytics (STOA)
Erschienen in RSC Advances
Verlag Royal Society of Chemistry (RSC)
Band 13
Heft 34
Seiten 23772 – 23787
Vorab online veröffentlicht am 08.08.2023
Nachgewiesen in Scopus
Web of Science
Dimensions

Verlagsausgabe §
DOI: 10.5445/IR/1000162432
Veröffentlicht am 22.09.2023
Originalveröffentlichung
DOI: 10.1039/D3RA02501B
Scopus
Zitationen: 13
Web of Science
Zitationen: 11
Dimensions
Zitationen: 13
Seitenaufrufe: 56
seit 22.09.2023
Downloads: 85
seit 27.09.2023
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