Synthesis and Characterization of (Y,Bi)AG∶Eu~(3+) Red Phosphor by Coprecipitation Method

Spherical-like(Y,Bi)AG∶Eu3+ red phosphor powders with good photoluminescence performance were synthesized by chemical co-precipitation method.By using DTA-TGA and XRD,both the thermal decomposition and phase formation of(Y,Bi)AG∶Eu3+ precursors were investigated in process of calcination.The crystal structures,surface morphology and luminescence properties of the phosphors with different Bi3+ contents were characterized by means of XRD,SEM and fluorescence spectrometer.The result shows that the pure YAG crystal phase is formed after calcination at 1000℃ or above.The photoluminescence intensity of YAG∶Eu3+ red phosphor strengthens with increasing Bi3+ content due to the sensitizing of Bi3+ to Eu3+,but decreases by excessive Bi3+ ions.When the Bi3+ content is 0.0010,the photoluminescence intensity reaches the highest.Addition of Bi3+ cannot change the crystal structure of YAG∶Eu3+ phosphor,which is garnet with a little different lattice parameter.The particles of(Y,Bi)AG∶Eu3+ red phosphor are spherical-like shapes,narrow size distributions with no aggregation.