ALUMINUM-GALLATE PHOSPHOR FOR VACUUM ULTRAVIOLET EXCITATION, PHOSPHOR MIXTURE FOR RARE GAS DISCHARG

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PROBLEM TO BE SOLVED : To provide a phosphor for vacuum ultraviolet excitation being reduced in the luminance deterioration during a heat treatment process and with time, having a wide color reproduction range and high luminance, to provide a rare gas discharge lamp having a wide color reproduction range, high luminous flux and a slight reduction in luminous flux with time when used as a backlight of LCD and a backlight for LCD, having high luminance and a slight reduction in luminance with time.SOLUTION : The aluminum-gallate phosphor for vacuum ultraviolet excitation is represented by a composition formula : (M1-a, Mna)(Al1-b, Gab)2O4 (wherein M is at least one of Mg, Ca, Sr and Zn; and a and b are each a number to satisfy conditions of 0.0005≤a≤0.3 and 0.02≤b≤0.17). The rare gas discharge lamp using a phosphor mixture composed of at least the phosphor, a red luminous phosphor and a blue luminous phosphor as a fluorescent screen is a light source for a backlight for LCD.COPYRIGHT : (C)2009, JPO&INPIT