Structural and emission properties of SrLaAlO4: Dy3+ phosphors

This article presents the structural, morphological and photoluminescence properties of SrLa1-xAlO4: xDy(3+) (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)-O-2-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 H-6(15/2)& RARR;P-6(7/2) transition being the utmost prominent one. The luminescence spectra of SrLa1-xAlO4 phosphors shown both blue (482 nm) and yellow (575 nm) emission which were assigned to F-4(9/2)& RARR;H-6(15/2) and F-4(9/2)& RARR;H-6(13/2) 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. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study presents the synthesis of SrLa1-xAlO4: xDy(3+) (x = 0, 1, 3, and 5 mol%) phosphors via solid-state reaction, and investigates their structural, morphological, and photoluminescence properties. The results reveal that these materials exhibit excellent luminescence and have potential for white light emission.