Abstract
A cost effective, environmentally benign and most convenient solution combustion scheme was utilized for preparing a series of Sr6Y2-2xSm2xAl4O15 (x = 0.5–10 mol%) crystalline nanophosphors. The morphological study and phase formation were examined via SEM (Scanning Electron Microscope) image, TEM (Transmission Electron Microscope) micrograph and measured PXRD (powder X-ray diffraction) patterns. The crystal structure information is gathered with the help of Rietveld refinement technique. Photoluminescence excitation-emission spectra revealed about the photometric characteristics of the synthesized down-conversion nanophosphors. The diffuse reflectance spectral measurements yield optical energy band gap of 5.96 eV and 5.88 eV for the host (Sr6Y2Al4O15) and optimized matrix (Sr6Y1.94Sm0.06Al4O15) respectively. The estimated CIE (international commission on illumination) chromaticity coordinates values were revealed to be located in orange-red section specifying their importance for solid state illumination. The optimum concentration of trivalent samarium ion as a dopant ion for this particular kind of matrix was observed to be 3.0 mol%, since, beyond this concentration, a fall in photoluminescence intensity occurred due to concentration quenching trend. The prominent feature of orange-red light emission by the prepared nanocrystalline phosphors upon excitation via near ultraviolet (NUV) light makes them potential contender for red emitting luminescent optical appliances.
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