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Y 2 O 2 S:Eu phosphors doped with different concentrations of Eu were fabricated by a high-temperature flux fusion method. For applications in field emission displays, phosphor powders were electrophoretically deposited on an indium-tin oxide coated glass substrate to form a phosphor screen. Cathodoluminescence properties of phosphor screens were examined at a low excitation voltage of 5 kV in a high-vacuum chamber (5 ϫ 10 Ϫ8 Torr), and characteristics of Y 2 O 2 S:Eu phosphors, including brightness and wavelength data, are presented and discussed. The red emission brightness for the Y 2 O 2 S:Eu phosphor screens can be significantly improved by adjustment of the Eu additions, which decrease the x coordinate slightly, while having no significant influence on the color performance. Considering the effects of Eu concentrations on red light emission spectra and brightness for Y 2 O 2 S:Eu phosphor screens, it is found that brightness for Y 2 O 2 S:Eu phosphor screens could be obtained up to 120 cd/m 2 with chromaticity of x ϭ 0.63 and y ϭ 0.36, and the Eu dopant concentration is suggested to be in the range 6-7.5 wt %.

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