Abstract
This article presents the structural, morphological and photoluminescence properties of SrLa1-xAlO4: xDy3+ (x = 0, 1, 3 and 5 mol%) phosphors synthesized via conventional solid state reaction technique. Single phase and tetragonal crystal structure of the prepared samples were confirmed by the X-ray diffraction (XRD) studies. Further, Fourier transform infrared spectroscopy (FTIR) confirms the existence of metallic bonds in all the samples. The Raman spectra confirmed the SrLaAlO4 structure and (Sr/La)-O2-Al oxygen bond present in the prepared samples. In addition, the investigations of photoluminescence spectra i.e., the emission and excitation spectra along with decay curves and color (x, y) coordinates in a sequence revealed the accurate optimum conditions for superior luminescence of the prepared samples. The characteristic sharp excitation peaks attributed to intra-4f transitions of Dy3+ ions in 325–475 nm range, in specific, the peak at 353 nm corresponding to 6H15/2→6P7/2 transition being the utmost prominent one. The luminescence spectra of SrLa1-xDyxAlO4 phosphors shown both blue (482 nm) and yellow (575 nm) emission which were assigned to 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions. Further, it is noticed that, the enhancement of doping concentration of Dy3+ ions led to reduction in decay lifetimes and shifting of Commission International De I'Eclairage (CIE) coordinates from blue to white light area. All the outcomes suggest that the Dy3+ activated SrLaAlO4 phosphors might be suitable for the emission of white light.
Published Version
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