Study of photoluminescence characteristics of KSr_(0.6-x)Ba_(0.4)PO_4:xTb~(3+) nanophosphor synthesized by glycine assisted combustion method

摘要

Terbium-activated KSr_(0.6)Ba_(0.4)PO_4 nanocrystals were synthesized by combustion method using an aqueous concentrated paste of calculated amounts of metal nitrates and glycine. The paste is kept in a preheated furnace maintained at 500°C. The advantages of short time reaction and low temperature solution base process have been exploited to produce KSr_(0.6-x)Ba_(0.4)PO_4:xTb~(3+) nanocrystals. The phase transformation involved in the pure homogeneous mixture formation. The nanocrystals obtained through combustion method were characterized by using scanning electron microscopy (SEM), X-ray diffractions (XRD) and photoluminescence (PL) spectra. The average nanoparticle size of the synthesized phosphor was 30-70 nm. The photoluminescence (PL) spectra shows predominant green colour of the nanocrystals prepared under an UV source revealed green luminescence, that was attributed to transitions ~5D_4 → ~7F_5 of Tb~(3+) was located at 545 nm. In addition, effect of heat treatment on the size of the nanocrystals and the dependence of the luminescence intensity on the Tb~(3+) concentrations has also been discussed.