Cathodoluminescent Properties of SrGa2S4:Eu2+ Phosphor for Field Emission Display Application

Cathodoluminescence (CL) properties of SrGa₂S₄ :Eu²⁺ phosphor synthesized by high temperature solid phase reaction have been presented at 0~10 kV and 0~100 muA/cm² . Photoluminescence (PL), CL and X-ray photoelectron spectroscopy (XPS) spectra were measured for phosphors before and after bombardment with high current densities. PL and CL spectra show that the commercial green phosphor ZnS: Cu, Au, Al after high current densities bombardment has a red shift. PL intensity of SrGa₂S₄:Eu²⁺ phosphor decreases after high current densities bombardment but the emission peak wavelength lambda_em does not change. XPS spectra show that the bombarded areas of SrGa₂S₄:Eu²⁺ phosphor have chemical reaction after high current densities bombardment. We proposed that the electron beam stimulated surface chemical reaction and thus reduced the brightness of the SrGa₂S₄:Eu²⁺ phosphor