3 research outputs found
On the luminescence characteristics of cerium and copper doped barium sulphide phosphor
Photoluminescence, thermoluminescence and phosphorescence studies of cerium and copper doped BaS phosphors are attempted. Cu+ centres in BaS lattice activate red emission while Ce3+ sensitize the blue emission. Results are explained on the basis of superposition theory involving monomolecular kinetics. In Randall and Wilkins model, the decay and TL studies are found to corelate each other.Cochin University of Science and Technolog
Investigations on Laser Induced Fluorescence and Related aspects of Barium Sulphide Phosphor Doped with Copper and Rare-Earth Elements
Laser induced fluorescence of BaS: Sm phosphor and energy level splitting of Sm3+ ion
Fluorescence of BaS: Sm phosphor has been studied using a pulsed Nitrogen laser (337.1 nm) as the excitation source. The spectrum consists of a broad band in the region 540β660nm superposed by the characteristic Sm3+ lines. Energy level splitting pattern of Sm3+ due to crystal field effects has been calculated and relevent field parameters are evaluated. Analysis shows that Sm3+ takes up Ba2+ substitutional sites.Cochin University of Science & Technolog