White light emission of nanocrystalline La1-xDyxSrAl3O7 phosphor via low temperature combustion process
Sheetal, SP Khatkar, VB Taxak and Sonika Singh
Nanocrystalline La1-xDyxSrAl3O7 phosphor has been successfully synthesized via low temperature urea assisted solution combustion route. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infra-red spectroscopy were used to characterize structural properties of Dy3+ doped LaSrAl3O7 nanophosphor. The results of XRD patterns indicate that all samples crystallized completely in tetragonal phase at sintering temperature 550 oC. The functional melilite AlO45- groups in LaSrAl3O7 host were identified using FT-IR spectrum. SEM and TEM analysis revealed tetragonal shaped particles with an average size in the range 65-75 nm. Optical properties were investigated by measuring excitation and emission spectra with decay curves of La1-xDyxSrAl3O7 nanophosphors. Emission spectrum exhibits characteristic blue (479 nm) and yellow emission (574 nm) corresponding to 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+ ions, respectively under excitation at 352 nm. Luminescence concentration quenching could be observed when the doping concentration of Dy3+ ions was more than 10 mol%. The CIE color coordinates (x = 0.332, y = 0.354) located in the white light region, makes this nanophosphor as potential candidate in new lighting devices.
How to cite this article:
Sheetal, SP Khatkar, VB Taxak, Sonika Singh. White light emission of nanocrystalline La1-xDyxSrAl3O7 phosphor via low temperature combustion process. Pharma Innovation 2018;7(1):553-560.