Abstract
A series of Fluorapatite-structured phosphors with structural formula Y6Ba4(SiO4)6F2 (YBSF) doped with different mol% (0.2, 0.4, 0.6, 0.8 & 1) of terbium were synthesized by solid-state reaction method and its structural and photoluminescence (PL) properties were studied. X-ray diffraction (XRD) patterns confirm that the prepared phosphors were successfully synthesized in the form of hexagonal crystal structure with space group P63/m. Prepared phosphors are polycrystalline in nature with rod-like structure and all the initial reactants were present. Presence of Si–H stretching in Fourier transform Infrared spectroscopy confirms the successful incorporation of terbium ion in the Host lattice. Photoluminescence excitation and emission spectra of the as-prepared phosphors show different transition of 4f8–4f75d and 4f–4f; moreover, the prepared phosphors when excited with 250 nm show blue emission due to 5D3–7FJ and show green emission due to 5D4–7FJ when excited by 290 nm. The results indicate that the emitted wavelength depend on excited wavelength and, therefore, can be tuned accordingly. The mechanism behind color tuning is due to cross-relaxation process which is discussed in detail in the present paper. The prepared phosphors showed high quantum efficiency with satisfactory thermal stability. Commission Internationale de I’Eclairage chromaticity coordinate also shows the shifting from blue region to green region for the prepared phosphors.
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Sahu, P.K., Agrawal, S. Structural and photoluminescence behavior of a blue–green-emitting Y6Ba4(SiO4)6F2:xTb3+ fluorapatite phosphor. J Mater Sci: Mater Electron 31, 18692–18705 (2020). https://doi.org/10.1007/s10854-020-04411-6
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DOI: https://doi.org/10.1007/s10854-020-04411-6