Structural, optical, morphological and photoluminescence properties of Dy doped Sr1-xAl2O4 : xDy (x = 0.05) phosphor by using urea fuel combustion method.

In the present study the Dy3+ doped Sr1-xAl2O4: xDy (x= 0.05) phosphor (SAD 0.05 phosphor) was synthesized with Sr(NO3)2 and Al(NO3).H2O as precursors utilizing the urea fuel combustion method at 610 °C temperature. After a structural study employing X-ray diffraction, the sample was found to be single phased in nature and to have crystallized into monoclinic phase match with standard JCPDS 34-0379 card. The optical band gap obtained for Dy3+ doped Sr1-xAl2O4: xDy (x= 0.05) phosphor (SAD 0.05 phosphor) is 2.6460 eV in the current scenario, showing that the sample is a wide band gap material. The majority of the particles appear to be irregular spherical grains with a mean size of 19–41 nm, according to transmission electron microscopy (TEM). The photoluminescence study revealed the three emission peaks in emission spectra with 572nm as dominant emission peak, by using 350nm as excitation wavelength. The CIE chromaticity diagram is used to calculate colour temperature 10475K and colour purity 21.95% of sample, the Dy3+ doped Sr1-xAl2O4: xDy (x= 0.05) phosphor (SAD 0.05 phosphor) can be tuned as light blue (0.28, 0.28) emission. The spectra are intense and lie in visible range. [ABSTRACT FROM AUTHOR]