Abstract: A series of Na_1+xSr_4-2x(BO₃)₃∶xCe³⁺ phosphors which can be excited by ultraviolet light were prepared by high temperature solid phase method. The phase structure, morphology and luminescence characteristics of the samples were characterized and analyzed by X-ray diffraction, scanning electron microscopy and fluorescence spectrum. X-ray diffraction results show that Ce³⁺ is successfully doped into NaSr₄(BO₃)₃. It is found that luminescence center of Ce³⁺ occupied Sr²⁺(1) and Sr²⁺(2) in NaSr₄(BO₃)₃ by means of Gaussian peak fitting and contrastive analysis of multiple spectra. The effects of Ce³⁺ doping concentration on the luminescence location and luminescence intensity were studied. With the increase of Ce³⁺ doping concentration, the emission spectra show a red shift and the luminescence intensity shows a trend of enhancing→weakening→re-enhancing. By comparing the emission spectra of phosphors with the absorption spectra of plant photosynthetic pigments, it is found that the phosphors can not only absorb 300~350 nm UV light, but also well cover the absorption band of blue light region required by plant photosynthetic pigments. This results show that the phosphor has potential value in agricultural production as a light conversion agent.

Key words: NaSr₄(BO₃)₃∶Ce³⁺, borate, high temperature solid phase method, blue phosphor, site occupation, light conversion agent, rare earth luminescent material