Combustion assisted spectroscopic investigation of Dy3+ activated SrYAl3O7 phosphor for LED and TLD applications

Long-persistent inorganic phosphors are widely studied materials owing to their high routine energy-storing ability. In the present study we were interested in Dy3+ ion‐doped inorganic phosphors for near ultraviolet (UV) excited light‐emitting diode (LED) applications. Dy3+ ion‐activated SrYAl3O7 phosphors were prepared using a solution combustion route at 550°C. Photoluminescence characterization of SrYAl3O7:Dy3+ phosphors showed a 482 and 573 nm emission peak in the blue and yellow region of the spectrum due to the 4F9/2→6H15/2 and 4F9/2→6H13/2 transition of Dy3+ ions under excitation at 325, 350, 366 and 388 nm in the near‐UV region. These emissions are supported for white light generation for LED lighting. Crystal structure of the proposed phosphor was determined by Reitveld refinement. Morphology of the sample was analysed using scanning electron microscopy (SEM), which showed that the samples were crystallized in a well known structure. As prepared sample was irradiated with a 60Co‐γ (gamma) source at a dose rate of 7.2 kGy/h. Thermoluminescence (TL) studies of these SrYAl3O7:Dy3+ phosphors were performed using a Nucleonix TL 1009I TL reader. Trapping parameters of this phosphor such as activation energy (E), order of kinetics (b) and frequency factor (s) were calculated using initial rise method and Ilich's method.