Abstract: There is provided a method for preparing a ?-SiAlON phosphor capable of be controlled to show characteristics such as high brightness and desired particle size distribution. The method for preparing a ?-SiAlON phosphor represented by Formula: Si(6-x)AlxOyN(8-y):Lnz (wherein, Ln is a rare earth element, and the following requirements are satisfied: 0<x?4.2, 0<y?4.2, and 0<z?1.0) includes: mixing starting materials to prepare a raw material mixture; and heating the raw material mixture in a nitrogen-containing atmospheric gas, wherein the starting materials includes a host raw material including a silicon raw material including metallic silicon, and at least one aluminum raw material selected from the group consisting of metallic aluminum and aluminum compound, and at least activator raw material selected from the rare earth elements for activating the host raw material.

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: There is provided a red phosphor including a compound represented by an empirical formula Az(Sr, M)2(Si, Al)O4-xNy (0<x<3, y=2x/3, and 0.001<z<0.1), and has a grain size distribution corresponding to 6.9 ?m?D50?13.9 ?m, wherein A is at least one element selected from a group consisting of lithium (Li), potassium (K) and sodium (Na), and M is at least one element selected from a group consisting of Barium (Ba), magnesium (Mg) and calcium (Ca).

Abstract: According to one embodiment of the present invention, a light-emitting-device package comprises a wavelength-converting layer which is formed on a light-emitting-device chip, comprises a fluorescent body and crystallized glass, and converts the wavelength of the light generated from the light-emitting-device chip. Consequently, by making the refractive indices of the phosphor and the crystallized glass comprised in the wavelength-converting layer coincide, it is possible to reduce the scattering losses which occur when the refractive indices differ. As a result, it is possible to improve the light-extraction efficiency of the light-emitting-device package. Also, because the to light-emitting-device package uses the wavelength-converting layer comprising the phosphor and the crystallized glass, the processability and reliability are outstanding and it is possible to reduce the processing time when the light-emitting-device package is produced.

Abstract: The fluorescent substance according to one embodiment of the present invention has the following compositional formula (1): [Compositional formula 1] SrySi(6?z)AlzOzN(8?z):Rex. Here, x, y and z are respectively 0.005?x?0.05, 0.05?y?0.5, 0.001?z?0.50, and Re is a rare earth element. As a result, the fluorescent substance according to one embodiment of the present invention can exhibit a short wavelength of between 525 nm and 537 nm when the concentration of strontium is between 0.05 moles and 0.5 moles. Also, the fluorescent substance can exhibit a short wavelength of between 525 nm and 537 nm by the addition of barium in a range of between 0.003 moles and 0.125 moles when the concentration of aluminium is high. Also, the fluorescent substance can exhibit a short wavelength of between 525 nm and 537 nm by adjusting the oxygen concentration by the addition not only of AlN but also of Al2O3 as an aluminium precursor when the concentration of aluminium is high.

Abstract: Disclosed are a phosphor, a method for preparing and using the same, a light emitting device package, a surface light source apparatus, a lighting apparatus using the phosphor, and a display apparatus. The phosphor includes an inorganic compound represented by an empirical formula (Sr, M)2SiO4-xNy:Eu, where M is a metallic element, 0<x<4, and y=2x/3.

Abstract: A method for producing a sialon phosphor is provided. The method includes mixing a silicon precursor and an aluminum precursor and sintering the mixture to form a first sintered body. The first sintered body and a precursor for an active material are mixed and the mixture is heat-treated to form a second sintered body. That is, the exemplary method for producing a sialon phosphor involves firstly forming the first sintered body serving as a host material to stably ensure a crystal structure, and then mixing the active material and the first sintered body so as to preserve the role of the active material without sacrificing the crystal structure of the first sintered body.

Abstract: A method for preparing a phosphor includes: dissolving at least one metal as a raw material of a desired phosphor in liquid ammonia to form a metal-amide type precursor; gathering the metal-amide type precursor; and firing the precursor to form a desired phosphor.

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: According to one embodiment of the present invention, a phosphor has the following composition formula (1): [composition formula 1] Si(6-z)AlzOyN(8-z):Rex, where x, y and z are 0.018?x?0.3, 0.3?y?0.75, 0.42?z?1.0, respectively, and Re is a rare earth element. Therefore, even when the aluminum concentration is 0.42 mol to 1.0 mol, a sialon phosphor of the present invention exhibits high luminance and has a particle size D50 varying between 5 to 20 ?m. In addition, a method for preparing a phosphor according to one embodiment of the present invention involves adjusting the oxygen concentration to ensure the superior crystallinity of the phosphor and thus improve the luminance thereof.

Abstract: Provided is a red phosphor having superior thermal and chemical stability and excellent luminous efficiency, wherein the red phosphor comprises a compound expressed in the composition formula: Az(Sr, M)2(Si, Al)O4?xNy:R(0<x<3, y=2x/3, 0.001<z<0.1), where A is at least one element selected from a group consisting of lithium (Li), potassium (K) and sodium (Na), M is at least one element selected from a group consisting of barium (Ba), magnesium (Mg), and calcium (Ca), and R is at least one element selected from a group consisting of lanthanide and a transition metal element.

Abstract: Provided is a white light emitting diode (LED) including a blue LED chip; and yellow, green, and red light emitting phosphors that are coated on the blue LED chip at a predetermined mixing ratio and converts light, emitted from the blue LED chip, into white light.

Abstract: A white light emitting device capable of expanding the wavelength range of a blue LED used for realizing white light. The white light emitting device according to the present invention includes a blue LED and a mixture of orange phosphor and green phosphor disposed above the blue LED.

Abstract: There is provided a phosphor having a ?-type Si3N4 crystal structure including oxynitride expressed by an empirical formula Si6-zAlzOzN8-z:Eua,Mb, M being at least one selected from among strontium (Sr) and barium (Ba), an amount (a) of europium (Eu) ranging from 0.1 to 5 mol %, an amount (b) of M ranging from 0.1 to 10 mol %, and a composition rate (z) of aluminum (Al) satisfying 0.1<z<1, and the phosphor emitting light having a peak wavelength ranging from 500 to 550 nm when excitation light is irradiated thereto.

Abstract: There are provided phosphors having high luminous efficiency at desired wavelengths and good light output stability and a light emitting device using the same. A phosphor according to an aspect of the invention includes a sulfide crystallographic phase and an oxide crystallographic phase. Here, the phosphor is a multiphase compound in which the sulfide crystallographic phase and the oxide crystallographic phase exist together.

Abstract: A method for preparing a phosphor includes: dissolving at least one metal as a raw material of a desired phosphor in liquid ammonia to form a metal-amide type precursor; gathering the metal-amide type precursor; and firing the precursor to form a desired phosphor.

Abstract: There is provided a method for preparing a ?-SiAlON phosphor capable of be controlled to show characteristics such as high brightness and desired particle size distribution. The method for preparing a ?-SiAlON phosphor represented by Formula: Si(6?x)AlxOyN(6?y):Lnz (wherein, Ln is a rare earth element, and the following requirements are satisfied: 0<x?4.2, 0<y?4.2, and 0<z?1.0) includes: mixing starting materials to prepare a raw material mixture; and heating the raw material mixture in a nitrogen-containing atmospheric gas, wherein the starting materials includes a host raw material including a silicon raw material including metallic silicon, and at least one aluminum raw material selected from the group consisting of metallic aluminum and aluminum compound, and at least activator raw material selected from the rare earth elements for activating the host raw material.

Abstract: A white light emitting device including: a blue light emitting diode (LED); a green silicate phosphor formed on the blue LED; and a red sulfide phosphor with a surface coated with a silicone oxide layer, the red sulfide phosphor formed on the blue LED.

Abstract: Provided is a white light emitting diode (LED) including a blue LED chip; and yellow, green, and red light emitting phosphors that are coated on the blue LED chip at a predetermined mixing ratio and converts light, emitted from the blue LED chip, into white light.

Abstract: There is provided a method for preparing a ?-SiAlON phosphor capable of be controlled to show characteristics such as high brightness and desired particle size distribution. The method for preparing a ?-SiAlON phosphor represented by Formula: Si(6-x)AlxOyN(8-y):Lnz (wherein, Ln is a rare earth element, and the following requirements are satisfied: 0<x?4.2, 0<y?4.2, and 0<z?1.0) includes: mixing starting materials to prepare a raw material mixture; and heating the raw material mixture in a nitrogen-containing atmospheric gas, wherein the starting materials includes a host raw material including a silicon raw material including metallic silicon, and at least one aluminum raw material selected from the group consisting of metallic aluminum and aluminum compound, and at least activator raw material selected from the rare earth elements for activating the host raw material.