KIT | KIT-Bibliothek | Impressum | Datenschutz

Structure and luminescence properties of Dy$^{3+}$ doped quaternary tungstate Li$_3$Ba$_2$Gd$_3$(WO$_4$)$_8$ 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 Li$_3$Ba$_2$Gd$_3$(WO$_4$)$_8$ doped with different concentrations of Dy$^{3+}$ (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 Li$_3$Ba$_2$Gd$_3$(WO$_4$)$_8$ to have a monoclinic structure (sp. gr. C2/c); the lattice constants for 1 at% doping concentration of Dy$^{3+}$ are a = 5.2126(2) Å, b = 12.7382(1) Å, c = 19.1884(3) Å, V$_{calc}$ = 1273,40(4) Å$^3$ 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 Li$_3$Ba$_2$Gd$_3$(WO$_4$)$_8$:Dy$^{3+}$ 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 Dy$^{3+}$:4F$_{9/2}$ → $^6$H$_{13/2}$ transition, and three weaker emissions peaks at 477, 661, and 750 nm. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162432
Veröffentlicht am 22.09.2023
Originalveröffentlichung
DOI: 10.1039/D3RA02501B
Scopus
Zitationen: 9
Web of Science
Zitationen: 7
Dimensions
Zitationen: 10
Cover der Publikation
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 Web of Science
Dimensions
Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page