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The process to prepare pure phase of hexagonal Y2O2S was investigated.Effect of mixed flux of Na2CO3 and S amounts was studied.The phase composition and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The results showed that the single phase of Y2O2S with smooth morphology could not be obtained as the molar ratio of Y2O3,Na2CO3 and S was in the range of 1∶(0.5-1)∶(2-3) until the molar ratio was increased to 1∶1.5∶4.Different Er3+ concentration doped Y2O2S∶Er powders were prepared with molar ratio of the raw materials 1∶1.5∶4.The quenching concentration of Er3+ in Y2O2S was more than 2 mol.％,which was due to the interaction of electric quadrupoles between Er3+ ions.