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The color conversion glass ceramics which were made of borosilicate matrix co-doped (SrBaSm)Si2O2N2∶ (Eu3+Ce3+) blue-green phosphors were prepared by two-step method in co-sintering.The change in luminescence properties and the drift of chromaticity coordinates (CIE) of the (SrBaSm)Si2O2N2∶ (Eu3+Ce3+) blue-green phosphors and the color conversion glass ceramics were studied in the sintering temperature range from 600 ℃ to 800 ℃.The luminous intensity and inteal quantum yield (QY) of the blue-green phosphors and glass ceramics decreased with the sintering temperature increasing.When the sintering temperature increased beyond 750 ℃,the phosphors and the color conversion glass ceramics almost had no peak in photoluminescence (PL) and excitation (PLE) spectra.The results showed that the blue-green phosphors had poor thermal stability at higher temperature.The lattice structure of the phosphors was destroyed by the glass matrix and the Ce3+ in the phosphors was oxidized to Ce4+,which further caused a decrease in luminescent properties of the color conversion glass ceramics.