The Synthesis And Properties Characterization Of Rare Earth Aluminate Phosphors And Transparent Ceramics

The YAG with good optical performance, is a kind of important laser matrix material. Compared with YAG single crystal, the advantage of YAG polycrystalline ceramics can be prepared to meet large size needed for the high power laser and achieve a high concentration of doped sample. The luminescent material with rare earth aluminate as the based has high luminous efficiency and good chemical stability characteristics, and it has been brought to the attention of people.Preparation of Y2O3 transparent ceramics is using solid phase method with Y2O3 nano powder as raw material, adding different dispersants and calcined at different temperatures. Comparison of different dispersants, the Y2O3 transparent ceramics using A40 slurry particles dispersed in the uniform has the highest light transmittance. Comparing different calcination temperature, the transparent ceramics using the calcination powder prepared in 1100℃ has the lowest porosity and high light transmittance.(CexY1-x/2Gd1-x/2)i.5Al5O12 transparent ceramics is prepared with Al2O3, Y2O3, Gd2O3 powders and Ce(NO3)3xH2O. The luminescence intensity of samples first increased and then decreased with the incorporation of Ce3+ ions increasing. The sample had the highest luminescence intensity when the doping amount was 0.03, and the samples had concentration quenching phenomenon if Ce3+ ions doped excessively. When increasing the amount of Ce3+ ions, the grain size of the samples were smaller. Transmittance of the samples first increased and then decreased with increasing incorporation of Ce3+ ions, and when the incorporation of Ce3+ion was x=0.03, it had the highest transmittance.Matrix material was prepared with Al2O3, Gd2O3 powder and Ce(NO3)3-xH2O, and mixed with different ions Mn+, Cr+, or Bi+to synthesis aluminate phosphor powders. The samples doped with Mn2+, Cr3+ ions had pure phase GAP only calcined at a temperature above 1300 ℃; the sample doped with Bi3+ ions had been had pure phase GAP calcined at 1100℃, but it would generate Bi2O3 if the amount of Bi3+ ions excessed; the sample doped with Bi3+ ions had full of pure phase GAP if calcined at 1200℃, so Bi3+ ions can reduce the crystallization temperature of GAP phase. Different GAP:Ce phosphor powders doped with different ions, the sample which had the maximum luminous intensity was doped with Bi3+ ions with amount of 0.1 mol and calcined at 1200℃, luminous intensity improved 5.4 times. Gd0.995-xBixAl:0.005Ce phosphor powders calcined at 1200℃, its particle size increased with the amount of Bi3+ ions increased.