Abstract: To provide an imaging device that shows high resolution and high luminance and produces good-quality images, an imaging device includes phosphor layer having a thickness of 40 ?m or less and containing a phosphor having a composition represented by chemical formula: Y2?x?yTbxScySiO5, wherein “x” and “y” are atomic ratios and satisfy the following conditions: 0<x?1 and 0<y?1. The phosphor preferably has a strongest diffraction peak at diffraction angle 2? of 30.65° to 30.9° in X-ray diffraction for better properties. The phosphor can be prepared by firing a mixture of a compound containing Y, Sc, and Tb with a compound containing Si.

Abstract: According to one aspect of the present invention, it is possible to sufficiently perform the discharging of charge without lowering the light emitting efficiency of an organic EL device and hence, the device can exhibit the light emitting efficiency higher than a conventional organic EL device and, at the same time, can prevent the degradation of the device. As an organic EL device to which the present invention is applied, on a glass transparent substrate, a transparent electrode, a hole injection layer and a hole transport layer which function as a hole transport function layer, a light emitting layer, an electron transport function layer, and a metal electrode are formed sequentially, and a drive power sources are connected to the transparent electrode and the metal electrode.

Abstract: An image display device includes phosphor layers which are formed on an inner surface of a light transmitting face plate, a black matrix film which is formed on the inner surface of the face plate in a state that the black matrix film defines the phosphor layers into phosphor layers of respective colors, and electron beam sources which are arranged in the inside of the evacuated envelope in a state that the electron beam sources face the phosphor layers in an opposed manner and irradiates electron beams to the phosphor layers. An area occupying ratio of the black matrix film as viewed from an image display screen side of the face plate is set within the range of 60% to 95%.

Abstract: The present invention can further enhance the light emission characteristics of phosphor excited by the irradiation of electron beams of high density. In a cathode ray tube including a phosphor film, a faceplate panel which constitutes a screen, an aluminum vapor-deposited film, a funnel and an electron gun, phosphor which constitutes the phosphor film applied to the faceplate panel is constituted of a terbium activated phosphor which is produced by substituting a portion of yttrium (Y) in base material crystals which contain zinc (Zn), yttrium (Y), silicon (Si) and oxygen (O) as main constitutional elements with terbium ion (Tb3+) and a trace amount of rare earth element ion is added to the terbium activated phosphor.

Abstract: A display apparatus includes a face plate that constitutes a part of a vacuum envelope, a phosphor layer formed on an inner surface of the face plate, and an electron beam source that emits electron beams to the phosphor layer. The face plate includes a light-emitting glass layer containing a light-emitting substance that emits light when electron beams are projected thereon. By extracting energy of electron beams, which have reached the face plate, as light, it is possible to reduce browning that occurs in the face plate and improve brightness of a display image significantly.

Abstract: A reflection film for reflecting electron beams is provided between an inner surface of a face plate and a phosphor layer. The electron beams which pass through a phosphor layer are reflected on the reflection film and are incident on the phosphor layer. Since the electron beams are reflected on the reflection film, the browning of the face plate can be decreased.

Abstract: The present invention provides a green emitting phosphor which includes an excess of the ordinary SiO2 component included in parent material Y2−2xSiO5 activated by Tb in terms of stoichiometric ratio. The composition of the above phosphor is represented by chemical formula: {(Y1−y−zMyGdz)1−xTbx}2(Si1−bGebO2)1+aO3 where values of x, y, z, a, and b are assigned, subject to 0<x≦1, 0≦y≦1, 0≦z≦1, 0<a≦1, and 0≦b≦1, and M is at least one element selected from a group comprising Sc, In, La, Lu, Yb, Ce, Eu, Sm, Tm, Ho, Er, and Nd. By using this phosphor, phosphors that emit light of higher luminance with less luminance degradation and are suitable for high-quality image display and imaging devices producing high-quality images are obtained.

Abstract: The present invention can further enhance the light emission characteristics of phosphor excited by the irradiation of electron beams of high density. In a cathode ray tube including a phosphor film, a faceplate panel which constitutes a screen, an aluminum vapor-deposited film, a funnel and an electron gun, phosphor which constitutes the phosphor film applied to the faceplate panel is constituted of a terbium activated phosphor which is produced by substituting a portion of yttrium (Y) in base material crystals which contain zinc (Zn), yttrium (Y), silicon (Si) and oxygen (O) as main constitutional elements with terbium ion (Tb3+) and a trace amount of rare earth element ion is added to the terbium activated phosphor.

Abstract: The present invention provides a cathode ray tube which can suppress a coloring phenomenon of a panel glass which is attributed to the irradiation of electron beams. At an electron beam irradiation side of a panel glass PNL of the cathode ray tube PRT, a transparent thin oxide layer TF of an element whose reduction by the irradiation of electron beams is difficult is formed. With the provision of the transparent thin oxide layer TF, the present invention suppresses the coloring phenomenon of the panel glass attributed to the irradiation of electron beams.

Abstract: The present invention provides a green emitting phosphor which includes an excess of the ordinary SiO2 component included in parent material Y2-2xSiO5 activated by Tb in terms of stoichiometric ratio.

Abstract: In a color cathode ray tube having a vacuum vessel that comprises a panel, a neck for housing an electron gun therein, and a funnel for connecting the panel and the neck, in which the inner surface of the panel glass is coated with a phosphor layer in different colors to give a display screen; the panel glass contains ions capable of selectively absorbing light within the range of visible rays, and its outer surface is coated with an electric conductive surface film.

Abstract: The current coefficient and saturation brightness of a phosphor is increased by coating the surfaces of phosphor particles (11, 21, 41) constituting a powdered phosphor with layers (12, 22, 42), preferably composed of phosphor, of 5 .mu.m, or less in thickness. A cathode-ray tube using this phosphor has a high luminance and/or a high resolution. If the above phosphor contains phosphor particles covered with electrically conductive phosphor and is used for an electroluminescence device or a vacuum fluorescent display, the life time and stability are improved.

Abstract: To provide a stable phosphor with a high brightness and little luminous degradation, a phosphor comprises yttrium, aluminum (a part or the whole of aluminum may be replaced with gallium), and oxygen as basic constituting elements, Tb or Ce as an activator, and the garnet structure as a crystal structure and in the curve 1-1 showing the temperature dependency of the thermoluminescence intensity, the integrated intensity of the thermoluminescence peak in the temperature range from 300K to 700K is made smaller than the integrated intensity of the thermoluminescence peak in the temperature range of less than 300K.

Abstract: Disclosed are terbium-activated oxide phosphors having incorporated, at least one of ytterbium, thulium, samarium and europium. Incorporation of the element (s) has made it possible to produce phosphors exhibiting high brightness and suffering little brightness deterioration under high-density electron bombardment.

Abstract: Disclosed are terbium-activated oxide phosphors having incorporated, at least one of ytterbium, thulium, samarium and europium. Incorporation of the element (s) has made it possible to produce phosphors exhibiting high brightness and suffering little brightness deterioration under high-density electron bombardment.