Luminescent Properties of Trivalent Praseodymium-Doped Barium Zinc Sulfide

Abstract

phosphors, emitting white to green light, were synthesized by the double-crucible method. X-ray diffraction results indicate that the raw materials were completely sulfurized at for . All samples doped with had orthorhombic crystal structures. The emission spectra are the results of (i) host-activator transition and (ii) direct excitation of ions. Obtained using UV light, the photoluminescence spectra include emission peaks between 470 and 520, 530 and 570, and 585 and . The maximum emission peak at is associated with the transition, and the intensity was maximal at a doping concentration of . The transitions, like the CIE (Commission Internationale de l'Eclairage) color coordinate from the white region to the green region, are sensitive to the concentration of the dopant ions. In response to excitement using purplish blue light, the maximum emission intensity at was maximal at a doping concentration of . The emission peaks almost disappeared, and the CIE color coordinates are all in the green region.