Abstract: A white light emitting device includes a blue light emitting diode (LED) configured to emit light having a dominant wavelength in a range of 440 nm to 450 nm; a green phosphor configured to convert at least a first portion of the light emitted by the blue LED to light having a peak wavelength in a range of 510 nm to 535 nm and having a full width at a half maximum of 35 nm or less; and a red phosphor configured to convert at least a second portion of the light emitted by the blue LED to light having a peak wavelength in a range of 610 nm to 635 nm and having a full width at a half maximum of 30 nm or less.

Abstract: There are provided a phosphor, a light emitting device, a surface light source device, a display device and an illumination device. The phosphor includes an ?-type Si3N4 crystal structure and includes oxynitride represented by an empirical formula CaxEuyMzSi12-(m+n)Aln+mOnN16-n, wherein M is at least one selected from a group consisting of Sr, Lu, La and Ba, and satisfies 0.5?x?1.1, 0.00005?y?0.09, 1.0?m?3.6, 0.001?n?0.2, and 0.00001?z?0.1.

Abstract: Disclosed is a method for preparing a fluorescent substance, which is represented by the formula M1-zEuzSiaObNc (M=Sr1-x-yBaxCay, 0 x 0.5, 0 y 0.2, 0<z 0.3, 2 a 2.5, 1.5 b 2, and 2 c 2.5), and the present invention provides the method for preparing a nitride-based fluorescent substance comprising the following steps: a preliminary firing step further comprising a first firing step of creating a first firing product by mixing and firing a first precursor group including an M precursor and a first silicon precursor, and a second firing step of creating a second firing product by mixing and firing a second precursor group including an Eu precursor and a second silicon precursor; and a secondary firing step of mixing and firing the first firing product and the second firing product.

Abstract: There are provided a phosphor, a light emitting device, a surface light source device, a display device and an illumination device. The phosphor includes an ?-type Si3N4 crystal structure and includes oxynitride represented by an empirical formula CaxEuyMzSi12?(m+n)Aln+mOnN16?n, wherein M is at least one selected from a group consisting of Sr, Lu, La and Ba, and satisfies 0.5?x?1.1, 0.00005?y?0.09, 1.0?m?3.6, 0.001?n?0.2, and 0.00001?z?0.1.

Abstract: Disclosed is a method for preparing a fluorescent substance, which is represented by the formula M1-zEuzSiaObNc (M=Sr1-x-yBaxCay, 0 x 0.5, 0 y 0.2, 0<z 0.3, 2 a 2.5, 1.5 b 2, and 2 c 2.5), and the present invention provides the method for preparing a nitride-based fluorescent substance comprising the following steps: a preliminary firing step further comprising a first firing step of creating a first firing product by mixing and firing a first precursor group including an M precursor and a first silicon precursor, and a second firing step of creating a second firing product by mixing and firing a second precursor group including an Eu precursor and a second silicon precursor; and a secondary firing step of mixing and firing the first firing product and the second firing product.

Abstract: An insulation structure for a storage tank and a method of constructing the insulation structure. Angle plates to which expansion joints and wires are assembled are vertically disposed around the storage tank, tensions of the wires, which are horizontally disposed around the storage tank, are adjusted, and then insulation panels having insulating materials attached thereto are disposed to thermally insulate the storage tank in order to protect a kind of oil that is contained in the storage tank.

Abstract: Disclosed is a method for preparing an oxide nano phosphor. A metal precursor solution is prepared. The metal precursor solution is impregnated into a porous polymer material. A heat treatment is performed on the porous polymer material having the metal precursor solution impregnated therein. The heat treatment is performed by heating the porous polymer material having the metal precursor impregnated therein up to a temperature of higher than 500° C. solution at a temperature elevating rate of higher than 100° C. per minute.

Abstract: Disclosed herein is a method for preparing nanophosphor powders. The method includes impregnating an aqueous solution of one or more metal salts into a fine crystalline polymeric material, drying the impregnated polymeric material, and subjecting the polymeric material to heat-treatment.