Abstract
Herein, we demonstrate the photoluminescence properties of Dy3+-activated YNbO4, LuNbO4, and mixed YxLu1−xNbO4:Dy3+ (x = 0.25, 0.5, 0.75) phosphors. For this purpose, five samples with a fixed Dy3+ concentration (2 mol%) were prepared by the solid-state reaction method. X-ray diffraction measurements showed that all phosphors crystallize in a monoclinic fergusonite-beta-(Y) structure with a C2/c space group. Scanning electron microscopy clearly shows that samples are composed of dense, well-developed micron-sized, cube-shaped grains with rounded edges. The photoluminescent emission spectra feature Dy3+ peaks at standard positions corresponding to transitions from the 4F9/2 excited emitting level to the 6HJ (J = 15/2; 13/2; 11/2 and 9/2) lower levels with two dominant emission bands placed in the blue (~ 479 nm, B) and yellow (~ 576 nm, Y) spectral region. It is observed that with Lu increase in the host lattice Y/B ratio decreases toward the desired ratio of unity to obtain white light. To evaluate the suitability of these phosphors for use in solid-state lighting, their photoluminescence emission was analyzed in detail by calculating CIE coordinates, correlated color temperature (CCT) and Delta u,v (DUV). It is shown that CIE chromaticity coordinates of all Dy3+-activated YxLu1−xNbO4 samples (x = 0, 0.25, 0.5, 0.75, and 1) fall into the white portion of the diagram and that with the increase of Lu in the host lattice color becomes whiter. CCT values for all samples are in the cooler 4000–4500 K range with positive DUVs indicating that color points are placed above the black body curve. The average lifetime of 4F9/2 level is calculated to be ~ 0.2 ms for all Dy3+-activated YxLu1−xNbO4 samples, indicating that there is no influence of the Y-to-Lu ratio in the host niobate material on the luminescence kinetics.
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The authors would like to acknowledge funding of the Ministry of Science, Technological Development, and Innovation of the Republic of Serbia under contract 451-03-47/2023-01/200017.
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LDF: investigation (lead), conceptualization (equal), writing/review & editing (equal). TD: investigation (equal). MM: investigation (equal). ZR: formal analysis (equal). JP: formal analysis (equal). VD: investigation (equal). ŽA: writing/original draft preparation (lead), visualization (lead). MDD: conceptualization (lead), writing/review & editing (equal).
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Far, L.Đ., Dramićanin, T., Medić, M. et al. Emission color tunability of dysprosium-activated YNbO4–LuNbO4-mixed phosphors. Appl. Phys. A 130, 107 (2024). https://doi.org/10.1007/s00339-023-07271-z
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DOI: https://doi.org/10.1007/s00339-023-07271-z