The Preparation of CaO:Dy3+, Na+ Rare Phosphor by High Sofid-State Method

The CaO:xDy3+, yNa+ phosphors, were synthesized by high solidstate method, and the starting materials are CaCO3Na2CO3 and Dy2O3. The effects of the Dy3+,Na+doping concentration on luminescent properties were studied by TG/DSC,XRD and PL spectra.The results indicated that when the sinter temperature of precursors over 950 °C,the main phase of the phosphor is CaO, and when x=0.02,y=0.15 we obtained the best luminescent properties of CaO:xDy3+, yNa+phosphors;Na+effectively enhances the luminescent properties of phosphors;The maximum emission wavelength is about 480 nm (blue),corresponding to 4F9 /26H15 /2 of Dy3+; There are a series of spectral lines in the 240-420 nm range of excitation spectrum,and the strong excitation peak located at 360 and 375 nm.