Photoluminescence in Bi Doped Bas Nanophosphor Prepared by Solid State Diffusion Method

Abstract

In the present work the nanophosphor BaS:Bi was prepared by solid state diffusion method which shows high intensity PL excitation and emission at 425 nm and 575 nm which corresponds to green color. However, for bulk phosphors emission peak is obtained at 608 nm corresponding to red color. Hence, a blue shift is observed in the spectrum. The optimize amount of activator (Bi) was found to be 0.3 mole% of BaS. The nature and amount of flux has a considerable effect on the peak intensity of the luminescence spectrum. The crystal phase was confirmed by XRD technique and mean size of the particles was determined by using Debye-Sherrer equation and found to be 20 nm, which was nearly same as observed in TEM. The SEM image shows the agglomeration of constituting particles.