Synthesis of infrared up-conversion material SrS:Eu,Sm

摘要

Europium and samarium co-doped strontium sulfide (SrS:Eu,Sm)infrared up-conversion phosphor was synthesized through calcining the precursor,which was prepared by the wet method with strontium carbonate (SrCO_3),sulfur (S),europium oxide (Eu_2O_3)and samarium oxide (Sm_2O_3)as the starting materials,and lithium fluoride (LiF),lithium carbonate (Li_2CO_3),natrium carbonate (Na_2CO_3)and potassium oxalate (K_2C_2O_4)as the fluxing agents,at 750-1200degC in a carbon-reducing atmosphere.The effects of calcining temperature,calcining time,category and concentration of the fluxing agents and concentration of dopants on the final up-conversion luminescence properties were studied.The SrS crystal structure is formed primarily at 750degC,but the best calcining temperature should be 1100degC.The most suitable calcining time is 1-1.5 h,the up-conversion luminscence intensity increases along with the increase of time within this range and decreases above the range.Excellent up-conversion luminescence was obtained with 10% fluxing agent LiF and 0.2% dopants Eu and Sm.The up-conversion emission spectrum is a continuous broadband spectrum with one peak at 599 nm which resulted from the transitions of Eu~(2+)5d(~2T_(2g))-> 4f(~8S_(11/2)).