Abstract: An alkaline earth aluminate phosphor for a cold cathode fluorescent lamp, which is represented by the compositional formula a (P1-xEux)O.(Q1-yMny)O.bAl2O3 and which is characterized by emitting light when irradiated with ultraviolet rays having a wavelength of from 180 to 300 nm (provided that in the above formula, P represents at least one alkaline earth metal element selected from Ba, Sr and Ca, Q represents at least one bivalent metal element selected from Mg and Zn, and a, b, x and y represent numbers which satisfy 0.8?a?1.2, 4.5?b?5.5, 0.05?x?0.25 and 0.2?y?0.4, respectively).

Abstract: This invention provides an alkaline earth chlorophosphate phosphor for a blue light emitting cold cathode fluorescent lamp, represented by (Sr10-k-l-m-nBakCalMgmEun)(PO4)6Cl2 wherein 0<k?1.5, 0?1?1.2, 0?m?0.25 and 0.05?n?0.3, a cold cathode fluorescent lamp using a blue light emitting phosphor represented by (Sr10-k-l-m-nBakCalMgmEun)(PO4)6Cl2 wherein 0?k?1.5, 0?1?1.2, 0?m?0.25 and 0.05?n?0.3, and a color liquid crystal display device using the lamp as backlight. The phosphor causes no significant lowering in luminescence brightness over time and no significant change in luminescent chromaticity over time under excitation with ultraviolet light at a wavelength of 180 to 300 nm and, particularly when used as backlight for a liquid crystal display, can realize image display with a wide color reproduction range.

Abstract: An alkaline earth aluminate phosphor for a cold cathode fluorescent lamp, which is represented by the compositional formula a (P1-xEux)O.(Q1-yMny)O.bAl2O3 and which is characterized by emitting light when irradiated with ultraviolet rays having a wavelength of from 180 to 300 nm (provided that in the above formula, P represents at least one alkaline earth metal element selected from Ba, Sr and Ca, Q represents at least one bivalent metal element selected from Mg and Zn, and a, b, x and y represent numbers which satisfy 0.8?a?1.2, 4.5?b?5.5, 0.05?x?0.25 and 0.2?y?0.4, respectively).

Abstract: A lanthanum phosphate phosphor for vacuum ultraviolet radiation, which is represented by a composition formula of (La1-x-yCexTby)PO4, wherein x and y are numbers which satisfy 0≦x≦0.2 and 0.05≦y≦0.3, respectively, and which emits light when irradiated with vacuum ultraviolet radiation having a wavelength of at most 200 nm.

Abstract: A lanthanum phosphate phosphor for vacuum ultraviolet radiation, which is represented by a composition formula of (La1-x-yCexTby) PO4, wherein x and y are numbers which satisfy 0≦x≦0.2 and 0.05≦y≦0.3, respectively, and which emits light when irradiated with vacuum ultraviolet radiation having a wavelength of at most 200 nm.