Synthesis and luminescence properties of red phosphor CaO: Eu3+

Ca(NO3)(2)center dot 4H(2)O, Eu(NO3)(3) and H2C2O4 center dot 2H(2)O were adopted to synthesize CaO: Eu3+ with the chemical co-precipitation method, and the effects of the calcination temperature and Eu3+ doping concentration on the phosphor structure and its luminescent properties were investigated by TG-SDTA, XRD, and PL-PLE. The results confirm that the Eu3+ ions as luminescent centers substitutes Ca2+ sites without changing the crystal structure of cubic CaO. The optimum calcination temperature and the optimum concentration of Eu3+ are 1 100 A degrees and 1 mol%, respectively, under which the best crystallinity and highest PL intensity appeared. The maximum emission wavelength is 592 nm (D-5(0)-> F-7(1)) which is excited by xenon lamp with the wavelength of 200-280 nm, indicating that the Eu3+ ion mainly locates in the symmetric position (O-h) in the crystal lattice of CaO.