Up/down conversion luminescence and charge compensation investigation of Ca0.5Y1−x(WO4)2:xLn3+ (Ln = Pr, Sm, Eu, Tb, Dy, Yb/Er) phosphors

• Phosphors Ca0.5Y(WO4)2:Ln3+ (Ln = Pr, Sm, Eu, Tb, Dy, Yb/Er) were synthesized.
• Structural and morphological investigations were carried out.
• Photoluminescence properties of as-synthesized phosphors were investigated.
• Photometric characteristics of the phosphors were studied.
• Enhancement of PL emission was found due to the addition of alkali chlorides.

Microstructures of Ca0.5Y(1−x)(WO4)2:xLn3+ (Ln = Pr, Sm, Eu, Tb, Dy, Yb/Er) phosphors were prepared via the solid-state reaction method. X-ray diffraction, scanning electron microscopy and photoluminescence were used to characterize the prepared phosphor samples. The results reveal that the phosphor samples have single phase scheelite structures with tetragonal symmetry of I41/a. The down/up conversion photoluminescence of the Ca0.5Y(1−x)(WO4)2:xLn3+ (Ln = Pr, Sm, Eu, Tb, Dy, Yb/Er) phosphors properties reveal characteristic visible emissions. The energy transfer process, fluorescence lifetime and color coordinates are discussed in detail. Furthermore, the phosphor Ca0.5Y(1−x)(WO4)2:xPr3+ co-doped with alkali chlorides shows the enhancement of luminescence, which was found in the sodium chloride co-doped powder phosphor. The photometric characteristics indicate the suitability of the inorganic powder phosphors for solid-state lighting and display applications.

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