Synthesis and Characterization of (Y,Bi)AG u3+ Red Phosphor by Coprecipitation Method

Spherical-like (Y,Bi)AG u3+ red phosphor powders with good photoluminescence performance were synthesized by chemical coa2precipitation method. By using DTA-TGA and XRD, both the thermal decomposition and phase formation of (Y,Bi)AG u3+ 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 r above. The photoluminescence intensity of YAG u3+ 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 u3+ phosphor, which is garnet with a little different lattice parameter. The particles of (Y,Bi)AG u3+ red phosphor are spherical-like shapes, narrow size distributions with no aggregation.