摘要:
A green emitting ZnS : Cu, Al cathodoluminescent phosphor having x and y coordinate values of from 0.250 to 0.280 and 0.560 to 0.615 respectively, is produced by a critical firing schedule exemplified by slow heating to about 1000.degree. C, soaking at this temperature for about 1 hour, followed by slow cooling at about 3.degree. C per minute to 700.degree. C, followed by air quenching. The phosphor is useful for example, in tri-color television color television cathode ray tube.
摘要:
A manganese-activated zinc orthosilicate phosphor having the empirical formula:Zn.sub.(2.00-x-y) Mn.sub.x SiO.sub.(4.00-y) (WO.sub.3).sub.zwherein:0.04.ltoreq.x.ltoreq.0.15;0.ltoreq.y.ltoreq.0.05; and0.ltoreq.z.ltoreq.0.002is provided. A method for preparing the above described phosphor is also disclosed. The method comprises blending a method for preparing manganese-activated zinc orthosilicate phosphor having the empirical formula:Zn.sub.(2.00-x-y) Mn.sub.x SiO.sub.(4.00-y) (WO.sub.3).sub.zwherein:0.04.ltoreq.x.ltoreq.0.15;0.ltoreq.y.ltoreq.0.05; and0.ltoreq.z.ltoreq.0.002;the method comprising: blending a zinc source, a manganese (II) source, a silicon source, and a tungsten source in amounts in accordance with the formula together with up to about 2 weight percent NH.sub.4 Cl and up to about 0.2 weight percent NH.sub.4 F to form a relatively uniform admixture; firing the admixture in a closed container under an inert atmosphere to form the phosphor; milling and washing the phosphor in an aqueous citric acid solution; and rinsing the citric acid washed phosphor with ammonium hydroxide. A low pressure mercury arc discharge device including the above-described phosphor is still further disclosed.
摘要翻译:具有以下经验式:Zn(2.00-x-y)Mn xSiO(4.00-y)(WO 3)z)的锰活化的原硅酸锌荧光体,其中:0.04≤x≤0.15; 0 = y = 0.05; 并且提供0 = z <= 0.002。 还公开了制备上述荧光体的方法。 该方法包括混合制备具有下列经验式的锰活化锌原硅酸盐荧光粉的方法:Zn(2.00-x-y)Mn xSiO(4.00-y)(WO 3)z其中:0.04 = 0.15; 0 = y = 0.05; 和0 = z 0.002; 该方法包括:将锌源,锰(II)源,硅源和钨源以根据式加上最多约2重量%的NH 4 Cl和最多约0.2重量%的NH 4 F的量共混以形成 相对均匀的混合物 在惰性气氛下将密封容器中的混合物焙烧以形成荧光体; 在柠檬酸水溶液中研磨和洗涤磷光体; 并用氢氧化铵冲洗柠檬酸洗涤的磷光体。 还公开了包括上述荧光体的低压汞电弧放电装置。
摘要:
The red and blue color cathode ray tube phosphors for color television are pigmented with a coating of an aqueous-insoluble silicate-based glass matrix containing pigment particles. When incorporated into a tridot color cathode ray tube, the contrast of the tube is improved. The coated particles are formed by dispersing the particles in a slurry with a silicate, the pigment particles and an optional wetting agent, and evaporating the slurry to dryness. The dried coated particles are then heated in order to insolubilize the glass matrix, and soluble ions are then removed by washing.
摘要:
A method for preparing a specific zinc orthosilicate phosphor particle having a nonparticulate, conformal aluminum oxide coating wherein all of a manganese activator is present as manganese (II) and occupies zinc (II) sites includes the steps of blending a zinc source, a manganese (II) source, a silicon source, and a tungsten source in amounts in accordance with said formula with an amount of up to about 2 weight percent NH.sub.4 Cl and up to about 0.2 weight percent NH.sub.4 F to form a relatively uniform admixture, firing the mixture in a closed container under an inert non-oxidizing atmosphere to promote retention of manganese in the plus two valance state whereby oxidation of manganese to a higher valence state is avoided and conditions promote larger particle size formation; milling and washing the phosphor in an aqueous citric acid solution to remove unreacted manganese; rinsing, drying and sieving the dried phosphor; and depositing a continuous, nonparticulate, conformal aluminum oxide coating on the dried phosphor particle.