A red emitting phosphor, CaO∶ Eu3+, Na+, was synthesized by high solid state method. The effects of the sinter temperature, the Eu3+, Na+ doping concentration on luminescent properties were studied by TG/SDTA, XRD and photoluminescence(PL) spectra. The results indicated that when the sinter temperature preponderates over 950 ℃, Eu3+and Na+, which act as luminescent and sensation, respectively, probe into crystal lattice of CaO. And the optimal concentrations of Eu3+ and Na+ are 1.5 mol% and 10 mol%, separately. Na+ ion, not only improves the stability of the host, but also effectively enhances the luminescent properties of patterns. The emission intensities of samples increase with the increase of firing temperature because crystalline of phosphor is improved. The maximum excitation presents a broad band peaked at 244 nm, due to the Eu3+-O2- charge transfer band by the wavelength of 200~400 nm excitation under xenon lamp; The maximum emission wavelength is 592 nm, corresponding to 5D0 7F1 of Eu3+, indicating that the Eu3+ ion locates in a symmetric position.
