论文部分内容阅读
Carbonate coprecipitate precursors were prepared by mixed nitrate solutions containing M2+(M2+=Sr2+,Ba2+),Y3+ and Er3+ as the cation sources and(NH4)2CO3 as the precipitator.MY2S4:Er3+ phosphors were synthesized by calcining the carbonate precursors with CS2 as the sulfurization reagent at 1050 ℃ for 4 h.XRD patterns show that the synthesized SrY2S4 and BaY2S4 crystalline powders possess the orthorhombic [CaFe2O4]-type structure.Photoluminescent measurements indicate that there were mainly red emitting(4F9/2→4I15/2) and green emitting(2H11/2→4I15/2 and 4S3/2→4I15/2) of Er3+ in the SrY2S4 while there was only red emitting(4F9/2→4I15/2) in BaY2S4:Er3+.BaY2S4:Er3+ is considered as a novel red phosphor candidate with a high monochromaticity.
Carbonate coprecipitate precursors were prepared by mixing nitrate solutions containing M2 + (M2 + = Sr2 +, Ba2 +), Y3 + and Er3 + as the cation sources and (NH4) 2CO3 as the precipitator .MY2S4: Er3 + phosphors were synthesized by calcining the carbonate precursors with CS2 as the sulfurization reagent at 1050 ° C. for 4 h. XRD patterns show that the synthesized SrY2S4 and BaY2S4 crystalline powders possess the orthorhombic [CaFe2O4] -type structure. Photoluminescent measurements indicate that there was mainly red emitting (4F9 / 2 → 4I15 / 2) and green emitting (2H11 / 2 → 4I15 / 2 and 4S3 / 2 → 4I15 / 2) of Er3 + in the SrY2S4 while there was only only red emitting (4F9 / 2 → 4I15 / 2) in BaY2S4: Er3 + .BaY2S4: Er3 + novel red phosphor candidate with a high monochromaticity.