Abstract: A light emitting device according to one embodiment includes: a board; plural first light emitting units each including a first light emitting element and a first fluorescent layer formed on the first light emitting element having a green phosphor; plural second light emitting units each including a second light emitting element and a second fluorescent layer formed on the second light emitting element having a red phosphor; the second fluorescent layers and the first fluorescent layers being separated in a non-contact manner with gas interposed there between; and plural third light emitting units each including a third light emitting element and a resin layer formed on the third light emitting element having neither a green phosphor nor the red phosphor, the third light emitting units being disposed between the first light emitting units and the second light emitting units.

Abstract: A light emitting device according to one embodiment includes a board; plural first light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; plural second light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; a first fluorescent layer formed on each of the first light emitting elements, the first fluorescent layer including a first phosphor; and a second fluorescent layer formed on each of the second light emitting elements, the second fluorescent layer including a second phosphor. The second phosphor is higher than the first phosphor in luminous efficiency at 50° C., and is lower than the first phosphor in the luminous efficiency at 150° C.

Abstract: A light emitting device according to one embodiment includes a board; a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm; a red fluorescent layer formed on the element, including a red phosphor expressed by equation (1), having a semicircular shape with a diameter r; (M1?x1Eux1)aSibAlOcNd??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al (Aliminum), rare-earth elements, and IVB group elements), an intermediate layer formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a diameter D; and a green fluorescent layer formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the diameter r and the diameter D satisfies equation (2): 2.0r(?m)?D?(r+1000)(?m).

Abstract: A light emitting device according to one embodiment includes a board; a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm; a red fluorescent layer formed on the element, including a red phosphor expressed by equation (1), having a semicircular shape with a diameter r; (M1?x1Eux1)aSibAlOcNd??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al (Aliminum), rare-earth elements, and IVB group elements), an intermediate layer formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a diameter D; and a green fluorescent layer formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the diameter r and the diameter D satisfies equation (2): 2.0r (?m)?D(r+1000) (?m).

Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 250 nm to 500 nm; plural red fluorescent layers that are formed above the light emitting element to include a red fluorescent material, the red fluorescent layers being disposed at predetermined intervals; and plural green fluorescent layers that are formed above the light emitting element to include a green fluorescent material, a distance between the light emitting element and the green fluorescent layers being larger than a distance between the light emitting element and the red fluorescent layers.

Abstract: A light emitting device according to one embodiment includes a light emitting element that emits light having a wavelength of 250 nm to 500 nm and a fluorescent layer that is disposed on the light emitting element. The fluorescent layer includes a phosphor having a composition expressed by the following equation (1) and an average particle diameter of 12 ?m or more. (M1?x1Eux1)3?ySi13?zAl3+zO2+uN21?w??(1) (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al, rare-earth elements, and IVB group elements. x1, y, z, u, and w satisfy the following relationship. 0<x1<1, ?0.1<y<0.3, ?3<z?1, ?3<u?w?1.

Abstract: A luminescent material is provided, which includes a carbide oxynitride-based compound having a composition represented by formula 1: (M1?wRw)uAl1?xSi1+vOzNtCy??formula 1 wherein M is at least one metal element excluding Si and Al, and R is a luminescent central element. w, u, x, v, z, t and y satisfy following relationships: 0.001<w<0.5; 0.66?u?1; 0.07?x?0.73; 0.06?v?0.84; 0.04?z?0.44; 2.7?t?3.1; and 0.019?y?0.13.

Abstract: A fluorescent substance is provided, with includes a matrix composed of a compound having an AlN polytypoid structure represented by the following general formula (1), and a luminescence center element: (Al,M)a(N,X)b??(1) wherein, M is at least one metal excluding Al, X is at least one non-metal excluding N, and a and b are positive values.

Abstract: A luminescent material is provided, which includes a carbide oxynitride-based compound having a composition represented by formula 1: (M1?wRw)uAl1?xSi1+vOzNtCy??formula 1 wherein M is at least one metal element excluding Si and Al, and R is a luminescent central element. w, u, x, v, z, t and y satisfy following relationships: 0.001<w<0.5; 0.66?u?1; 0.07?x?0.73; 0.06?v?0.84; 0.04?z?0.44; 2.7?t?3.1; and 0.019?y?0.13.

Abstract: An image display device is provided, which includes a first substrate having a cold-cathode electron-emission element which emits electrons, and a second substrate which is spaced from and opposed to the first substrate. The second substrate has a transparent substrate, a light-emitting layer provided on the transparent substrate and including phosphor particles containing zinc sulfide as a base material, a boron nitride film disposed on a surface of the light-emitting layer, and an anode applying a voltage to the light-emitting layer.

Abstract: In a method of driving a display apparatus, a first combination of a first anode voltage and a first element voltage is selected to apply the first anode voltage to the anode electrode and apply the first element voltages to electron emitting elements selectively, during a first period. The first combination is changed to a second combination of a second anode voltage and a second element voltage after the first period to apply the second anode voltage to the anode electrode and apply the second element voltages to the electron emitting elements selectively, during a second period. After the second period, the second combination is also change to the first combination.

Abstract: A fluorescent substance is provided, with includes a matrix composed of a compound having an AlN polytypoid structure represented by the following general formula (1), and a luminescence center element: (Al, M)a(N, X)b ??(1) wherein, M is at least one metal excluding Al, X is at least one non-metal excluding N, and a and b are positive values.

Abstract: In a method of driving a display apparatus, a first combination of a first anode voltage and a first element voltage is selected to apply the first anode voltage to the anode electrode and apply the first element voltages to electron emitting elements selectively, during a first period. The first combination is changed to a second combination of a second anode voltage and a second element voltage after the first period to apply the second anode voltage to the anode electrode and apply the second element voltages to the electron emitting elements selectively, during a second period. After the second period, the second combination is also change to the first combination.

Abstract: In the method, apparatus and the substance produced thereby: a plasma flame 1 is produced by a plasma torch 11; the plasma flame 1 is passed through a plasma flame furnace 21 which controls the heat of the plasma flame 1; then, the plasma flame 1 is injected into a reactor column 31 to heat the substance. The substance may be a particle. The plasma flame 1 has a wide flame area in which a temperature of flame is uniform.

Abstract: The present invention provides a plasma display panel, comprising a rear substrate provided with ribs defining discharge cells, address electrodes and phosphor layers, and a front substrate provided with transparent electrodes extending in a direction perpendicular to the address electrodes, a transparent dielectric layer and a protective layer, discharge being brought about within the discharge cell formed between the rear substrate and the front substrate to excite the phosphor contained in the phosphor layer so as to cause the phosphor to emit a visible light. In this plasma display panel, the phosphor particles forming the phosphor layer have an average particle size of 0.1 to 5 .mu.m and a ratio of the largest curvature to the smallest curvature of at most 1.5. Also, the magnitude of the irregularities on the surface of the phosphor particle is at most 5% of the diameter of the phosphor particle.

Abstract: Disclosed is a phosphor suitable for use in a cathode-ray tube, a fluorescent lamp, a radiation intensifying screen, which comprises transparent spherical particles having an average particle size of 0.5 to 20 .mu.m and a ratio of the major diameter to the minor meter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 .mu.m less in an amount of 5 wt % or less.

Abstract: In the method, apparatus and the substance produced thereby: a plasma flame 1 is produced by a plasma torch 11; the plasma flame 1 is passed through a plasma flame furnace 21 which controls the heat of the plasma flame 1; then, the plasma flame 1 is injected into a reactor column 31 to heat the substance. The substance may be a particle. The plasma flame 1 has a wide flame area in which a temperature of flame is uniform.

Abstract: A method of manufacturing a phosphor material, which comprises the steps of, generating thermal plasma, supplying a conductive material into the thermal plasma so as to evaporate the conductive material, supplying phosphor particles into the thermal plasma so as to allow the conductive material to adhere onto the surface of the phosphor particles, and cooling the phosphor particles having the conductive material adhered thereon. By making use of this method, it is possible to manufacture a phosphor material comprising a phosphor particle and a conductive layer formed on the surface of the phosphor particle, wherein the ratio between the minor axis and the major axis of the phosphor material is 1.5 or less.

Abstract: A specific binding material labeled with an ultrafine inorganic phosphor 1 to 100 nm in particle size is disclosed The composition of the ultrafine inorganic phosphor is one of Ln.sub.2 O.sub.3 :Re, Ln.sub.2 O.sub.2 S:Re, ZnO, CaWO.sub.4, MO.xAl.sub.2 O.sub.3 :Eu, Zn.sub.2 SiO.sub.4 :Mn, and LaPO.sub.4 :Ce,Tb, wherein Ln represents at least one element selected from La, Gd, Lu, and Y, Re represents at least one element selected from lanthanide elements, M represents at least one element selected from alkali earth metals, and x represents a value from 0.5 to 15. This ultrafine inorganic phosphor is prepared by one of the following processes a process of evaporation in a gas including an RF thermal plasma process, dc plasma thermal spraying, sputtering, glass crystallization, a sol-gel process, precipitation including hydrothermal synthesis, and a spraying process.

Abstract: A raw material prepared by washing a phosphor powder containing a phosphor host material and an activator with an acid solution, followed by drying the washed powder, is heated within a thermal plasma at a temperature which permits partially melting the phosphor, followed by cooling and subsequently subjecting the resultant phosphor at 1200.degree. to 1700.degree. C., thereby manufacturing spherical phosphor particles having a concentration gradient in a radial direction.