Abstract
Polycrystalline powders of KLa(1−x)Dyx(PO3)4 (x=0.5%, 1%, 5% and 10%) with linear chain have been grown by solid state reaction. The obtained powders are characterized by X-ray powder diffraction, FTIR and Raman spectroscopies. Emission, excitation spectra and decay curves analysis have been used to study the spectroscopic properties of Dy3+ in KLa(PO3)4. The photoluminescence spectra show two characteristic blue and yellow bands of Dy3+. The yellow-to-blue emission intensity ratios and CIE chromaticity coordinates have been determined from emission spectra to evaluate the emitted light as function of Dy3+ concentration. The measured decay rates for 4F9/2→6H15/2 deviated from exponential to non-exponential shape with increase of Dy3+ concentration. The observed non-exponential behavior of the decay curve has been fitted to Inokuti–Hirayama model, which indicates that the energy transfer between the donor and the acceptor is of dipole–dipole nature. The energy transfer, between the donor (excited Dy3+) and the acceptor (unexcited Dy3+), increases with Dy3+ ions concentration.
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