Effects of Eu2 + Concentration Variation and Ce3 + Codoping on Photoluminescence Properties of BaGa2S4 : Eu2 + Phosphor

Abstract

phosphor samples were synthesized by a solid-state reaction method. The lattice parameter of the phosphor samples was linearly decreased from 12.654 to , and the main emission wavelength was shifted from 501 to with increase of the ion concentration from 0.05 to 0.50. The relative photoluminescence (PL) intensity under excitation was increased with increase of the from 0.05 to 0.25 due to the excitation band extended to the longer wavelength. However, when , the PL intensity was decreased due to nonradiative transitions among the ions and the formation of impurity phase. The Commission International de l’Eclairge chromaticity coordinates were also largely shifted from the bluish-green emitting region (, ) to the green emitting one ( = 2.414, = 0.658) by increasing the from 0.05 to 0.50. The energy transfer from the ion to the ion enhanced the PL intensity of the ion emission under near ultraviolet and blue excitation. The PL intensity of the phosphor sample was higher by 24% than that of the phosphor sample under excitation.