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- W2378813410 abstract "Yb and Er co-doped La2O2S powders were prepared by sulfate reduction method.Effects of the amount of citric acid,calcination temperature of precursor,carbon reduction temperature,Er3+ ion concentration and Yb3+ ion concentration on the powders were investigated.The phase composition,morphology,particle size,reflectivity and upconversion luminescence were characterized by X-ray diffractometry(XRD),scanning electron microscopy(SEM),specific surface area analysis(BET),ultraviolet-visible spectrophotometry(UVPC) and phosphorescence spectrum analysis(PL).The results show that pure La2(SO4)3 can be obtained at 800℃,pure La2O2S powder are got when carbon reduction temperature is above 900℃,the particle size is about 100～200nm,the particles have some agglomeration,as the molar ratio of citric acid and nitrate is 1.5:1,the concentration of Er3+ is 2 mol%,the concentration of Yb3+ is 12 mol%,the upconversion luminescent intensity was the strongest." @default.
- W2378813410 created "2016-06-24" @default.
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- W2378813410 date "2012-01-01" @default.
- W2378813410 modified "2023-09-26" @default.
- W2378813410 title "Up-conversion Luminescence of La_2O_2S∶Yb,Er Prepared by Sulphate Reduction Method" @default.
- W2378813410 hasPublicationYear "2012" @default.
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