Abstract: A phosphor improved against luminance deterioration with time under vacuum ultraviolet irradiation, a phosphor paste composition, and a vacuum ultraviolet excitation light emitting element high in luminance retaining rate and improved in luminance, are presented. An alkaline earth aluminate phosphor which is a phosphor represented by the formula a (M1-xEux)O.6Al2O3 (wherein M represents at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, and x and a satisfy 0<x<1 and O.9?a?1.8, respectively) and which has a wide-band peak over an angle region of diffraction angle (2?) of from 28° to 31° in powder diffraction X-ray spectrum by CuK?1 characteristics X-ray, and a vacuum ultraviolet excitation light emitting element provided with a fluorescent layer made of the phosphor.

Abstract: The invention relates to a color liquid crystal display device with a combination of light shutters that utilize a liquid crystal, a color filter having color elements of at least three colors of red, green and blue corresponding to the light shutters, and a backlight for transmission illumination.

Abstract: A blue-emitting bivalent metal silicate phosphor improved in the luminance efficiency, the durability against deterioration by VUV and the powder characteristic, and a process for its production, a phosphor paste composition employing such an improved phosphor, and a VUV excitation type light-emitting device having high luminance. The phosphor is an Eu-activated bivalent metal silicate phosphor represented by the compositional formula CaMgSi2O6:Eu, wherein a specific amount of at least one member among La, Ba, Sr, Zn, Y, Ce, In, Bi, chlorine, bromine and iodine, is contained in the crystalline matrix.

Abstract: There are provided color liquid crystal display devices with high color purity of NTSC percentage of at least 80%.

Abstract: A blue-emitting bivalent metal silicate phosphor improved in the luminance efficiency, the durability against deterioration by VUV and the powder characteristic, and a process for its production, a phosphor paste composition employing such an improved phosphor, and a VUV excitation type light-emitting device having high luminance. The phosphor is an Eu-activated bivalent metal silicate phosphor represented by the compositional formula CaMgSi2O6:Eu, wherein a specific amount of at least one member among La, Ba, Sr, Zn, Y, Ce, In, Bi, chlorine, bromine and iodine, is contained in the crystalline matrix.

Abstract: An aluminate phosphor activated with Eu or coactivated with Eu and Mn, which contains sulfur; a process for its production; a phosphor paste composition; and a vacuum ultraviolet ray excitation type light-emitting device having a fluorescent layer made of such a phosphor.

Abstract: An aluminate phosphor activated with Eu or coactivated with Eu and Mn, which contains sulfur; a process for its production; a phosphor paste composition; and a vacuum ultraviolet ray excitation type light-emitting device having a fluorescent layer made of such a phosphor.

Abstract: A manganese-activated aluminate phosphor represented by the following compositional formula and a vacuum ultraviolet ray excitation type light-emitting element having this phosphor as a fluorescent layer:(1-a)(bMO.multidot.6Al.sub.2 O.sub.3).multidot.a(MMg.sub.1-c Mn.sub.c Al.sub.10 O.sub.17)wherein M is at least one member of Ba and Sr, and a, b and c are numbers satisfying the conditions of 0.05.ltoreq.a.ltoreq.1.0, 0.64.ltoreq.b.ltoreq.0.86, 0.05.ltoreq.c.ltoreq.1.0 and 0.05.ltoreq.a.times.c.ltoreq.0.

Abstract: An aluminate phosphor comprising (a) at least one element selected from the group consisting of Ba, Sr and Ca, (b) Eu, (c) Mg and/or Zn, (d) optionally Mn and (e) Al, said aluminate phosphor comprising a crystalline inorganic compound which shows, in its powder X-ray diffraction pattern upon incidence of X-rays of CuK.alpha..sub.1, no peak at Miller index 008 independent of a diffraction peak at Miller index 110.

Abstract: A bivalent europium-activated alkaline earth haloborate phosphor which contains lithium as coactivator, a process for its production, and an ultraviolet ray excited fluorescent tube such as a fluorescent lamp having a fluorescent layer containing such a phosphor as the blue-emitting component.