EPJ Web of Conferences (Jan 2023)

CaWO4:Yb3+,Tm3+ Crystals and SrAl2O4:Eu2+,Dy3+ Phosphors in Glass-Based Composites for Green Afterglow after NIR Excitation

  • Santos Magalhães Evellyn,
  • Sedda Ahmed,
  • Bondzior Bartosz.,
  • Vuori Sami,
  • Van der Heggen David,
  • Smet Philippe F.,
  • Lastusaari Mika,
  • Petit Laeticia

DOI
https://doi.org/10.1051/epjconf/202328705043
Journal volume & issue
Vol. 287
p. 05043

Abstract

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Here, we present the preparation of composites with green persistent luminescence using melting process. The composites are phosphate glass (75NaPO3-25CaF2 and 90NaPO3-10NaF (in mol%)) with embedded phosphors: CaWO4: Yb3+, Tm3+ crystals with blue upconversion and SrAl2O4:Eu2+,Dy3+ with green persistent luminescence. Green persistent luminescence above 0.3 mcd/m2 can be seen for ~ 30 minutes after charging with 980 nm due to energy transfer between the blue upconverter crystals and the persistent luminescent phosphors. Challenges related to the fabrication of such composites are discussed.