Abstract: To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.

Abstract: The present disclosure provides an encapsulated fluorescent adhesive layer, a method for manufacturing the same, and a quantum dot backlight. The quantum dot backlight includes a substrate, a light emitting chip, and the encapsulated fluorescent adhesive layer. The encapsulated fluorescent adhesive layer is used for heat transfer and heat dissipation.

Abstract: A method for forming a substrate with a multi-layered, flexible, and anti-scratch metal oxides protective coating being deposited onto the substrate is provided in the present invention, wherein the top most layer of the coating comprises Al2O3 or a mixture thereof such that the top most layer acts as an anti-scratching layer. The multi-layered, flexible and anti-scratch metal oxides protective coating also retains the flexibility of the underlying substrate.

Abstract: A film for changing a wavelength of light, including: a nano-porous membrane including a plurality of pores each having a first opening at a first surface of the nano-porous membrane and each extending in an extension direction towards a second surface of the nano-porous membrane opposite to the first surface of the nano-porous membrane, wherein the plurality of pores is arranged according to a predetermined pattern; a plurality of first quantum dots of a first quantum dot type, provided in the plurality of pores; and a plurality of second quantum dots of a second quantum dot type, provided in the plurality of pores.

Abstract: A wavelength converter 100 includes: a first phosphor 1 composed of an inorganic phosphor activated by Ce3+; and a second phosphor 2 composed of an inorganic phosphor activated by Ce3+ and different from the first phosphor. At least one of the first phosphor and the second phosphor is particulate. The first phosphor and the second phosphor are bonded to each other by at least one of a chemical reaction in a contact portion between the compound that constitutes the first phosphor and a compound that constitutes the second phosphor and of adhesion between the compound that constitutes the first phosphor and the compound that constitutes the second phosphor.

Abstract: A wavelength converting structure is disclosed, the wavelength converting structure including an SWIR phosphor material having emission wavelengths in the range of 1000 to 1700 nm, the SWIR phosphor material including at least one of a perovskite type phosphor doped with Ni2+, a perovskite type phosphor doped with Ni2+ and Cr3+, and a garnet type phosphor doped with Ni2+ and Cr3+.

Abstract: A method for producing ?-sialon fluorescent material having excellent emission intensity is provided. The method for producing ?-sialon fluorescent material includes providing a composition comprising silicon nitride that contains aluminium, an oxygen atom, and europium, heat treating the composition, contacting the heat-treated composition with a basic substance, and washing the composition, which has been contacted with the basic substance, with an acidic liquid medium.

Abstract: The disclosure relates to a scintillator and a radiation detector including the scintillator. The scintillator includes a scintillator material. In an embodiment, the scintillator material can include a metal halide doped with Eu2+ and co-doped with Sm2+. The metal halide can include at least one halogen selected from Br, Cl, and I. In an embodiment, the metal halide can include at least one element selected from alkaline-earth metals, rare-earth elements, Al, Ga, and the alkali metals selected from Li, Na, Rb, Cs. In a particular embodiment, co-doping with Sm2+ can shift the scintillation light emission peak to a region of the emission spectrum having a low self-absorbance of the scintillator material.

Abstract: The present invention relates to a light emitting device comprising a red-emitting Eu3+ material and green emitting Ce3+ material which are matched so that the resulting white light has an increased lumen equivalent of radiation for a given color rendering index than with the prior art.

Abstract: The present invention relates to a glass member in which an inorganic phosphor is dispersed in a glass matrix, in which the glass member includes an SiO2—B2O3 based glass as the glass matrix, and the SiO2—B2O3 based glass includes SiO2 as a main component thereof, and includes, based on a total amount of the SiO2—B2O3 based glass: Al2O3 in an amount of 4 to 10 wt %; and MgO and ZnO in a total amount of 0.1 to 0.7 wt %.

Abstract: Provided are a wavelength conversion member including: a quantum dot phosphor; a white pigment including an organic substance layer that contains an organic substance, on at least a part of a surface of the white pigment; and a resin cured product including the quantum dot phosphor and the white pigment.

Abstract: A product having at least one plasma lamp that includes plates that are approximately parallel, with at least one array of microcavities formed in a surface of at least one plate. When desirable, the plates are separated a fixed distance by spacers with at least one spacer being placed near the plate's edge to form a hermetic seal therewith. A gas makes contact with the microcavity array. Electrodes capable of delivering a time-varying voltage are located such that the application of the time-varying voltage interacts with the gas to form a glow discharge plasma in the microcavities and the fixed volume between the plates. The glow discharge plasma efficiently and uniformly emits radiation that is predominantly in the UV/VUV spectral range with at least a portion of the radiation being emitted from the plasma lamp.

Abstract: Strontium tetraborate is used as an optical coating material for optical components utilized in semiconductor inspection and metrology systems to take advantage of its high refractive indices, high optical damage threshold and high microhardness in comparison to conventional optical materials. At least one layer of strontium tetraborate is formed on the light receiving surface of an optical component's substrate such that its thickness serves to increase or decrease the reflectance of the optical component. One or multiple additional coating layers may be placed on top of or below the strontium tetraborate layer, with the additional coating layers consisting of conventional optical materials. The thicknesses of the additional layers may be selected to achieve a desired reflectance of the optical component at specific wavelengths. The coated optical component is used in an illumination source or optical system utilized in a semiconductor inspection system, a metrology system or a lithography system.

Abstract: A fluorescent material particle including: a particle that contains a thiogallate phosphor and a first adherent member containing boron oxide and being disposed on the surface of the particle, a method for producing the fluorescent material particles, and a light emitting device are provided.

Abstract: A light emitting device includes a light emitting element including a first surface; a light guide member covering at least a part of a lateral surface of the light emitting element; a first wavelength conversion member covering the first surface and including a first wavelength conversion particles; and a reflective member being in contact with the light emitting element. The first wavelength conversion member has a thickness of 60 ?m or more and 120 ?m or less. The first wavelength conversion particles have an average particle size of 4 ?m or longer and 12 ?m or smaller; the first wavelength conversion particles have a central particle size of 4 ?m or longer and 12 ?m or smaller. A weight ratio of the first wavelength conversion particles is 60% by weight or more and 75% by weight or less with respect to the total weight of the first wavelength conversion member.

Abstract: Provided is a light source device including: at least one light emitting element of at least one type; at least one far-red phosphor that, when excited by output light from the light emitting element, emits light having a peak in a wavelength range of 680 nm or more to less than 780 nm; and at least one phosphor that, when excited by the output light from the light emitting element, emits light having a peak in a wavelength range different from the wavelength range of the light emitted from the far-red phosphor. The spectrum of light emitted from the light source device has characteristic A below. This light source device has sufficient emission intensity over the entire visible range, i.e., over a wavelength range of from 400 nm to 750 nm inclusive. Characteristic A: The ratio of a minimum emission intensity to a maximum emission intensity in a wavelength range of from 400 nm to 750 nm inclusive is 20% or more.

Abstract: The invention relates to pyrosilicate phosphors comprising a coating of aluminum oxide, to a process for the preparation of these compounds, and to the use thereof as conversion phosphors or in lamps.

Abstract: Provided is a light-emitting device including a mount board, an LED element mounted on the mount board, and a translucent or transparent sealing resin being filled onto the mount board to seal the LED element. The sealing resin contains first and second particulate phosphors excited by emitted light from the LED element, and a nanoscale filler having an average particle size in the range of 1 nm to 100 nm. The specific gravity of the first particulate phosphor is smaller than that of the second particulate phosphor. The sealing resin includes a dispersion layer of the first particulate phosphor covering areas obliquely above and beside the LED element, and a deposition layer of the second particulate phosphor on upper surfaces of the mount board and the LED element. The first particulate phosphor is dispersed in the dispersion layer among aggregates formed by particles of the nanoscale filler.

Abstract: A phosphor of a chemically stable inorganic luminescent material having a NASICON structure and an application product including the phosphor, such as a light-emitting device. A phosphor having the formula of A1+xBxC2?xD3X12:AEy where A is one or two types of elements of monovalent metal cations, B is one or two types of elements of trivalent cations, C is one or two types of elements of tetravalent cations, D is one or two types of elements of pentavalent cations, X is one or two types of elements of N, O, F, P, S, O, Cl, and Br, AE is one or two types of elements of Mn, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Th, U, and Bi, 0?x?2, and 0?y?0.1.

Abstract: A phosphor containing particle including a core portion which is a particulate matter of resin including a constitutional unit derived from an ionic liquid with a semiconductor nanoparticle phosphor dispersed therein and a shell portion which is a matter in a form of a layer of resin which includes a constitutional unit derived from an ionic liquid and coats at least a portion of the core portion, and a phosphor containing particle including a particulate matter of resin including a constitutional unit derived from an ionic liquid with a semiconductor nanoparticle phosphor dispersed therein and a metal oxide layer coating at least a portion of the particulate matter of resin. A light emitting device including a light source and a wavelength converter in which phosphor containing particles are dispersed in a translucent medium, and a phosphor containing sheet in which phosphor containing particles are dispersed in a sheet-shaped translucent medium.

Abstract: In some embodiments, an electrodeless lamp may be provided. The lamp may include an outer tube and an inner tube. The inner tube may be sealed to the outer tube to define a sealed space in which a gas may be contained. The gas may be configured to emit electromagnetic radiation when an electromagnetic field is applied thereto.

Abstract: A conversion element includes a platelet including an inorganic glass, and first converter particles having a shell and a core, wherein the shell includes an inorganic material and the core includes a nitride or oxynitride luminescent material and the first converter particles are arranged on and/or in the platelet.

Abstract: A wavelength conversion member comprises: a substrate; and a wavelength conversion layer. The wavelength conversion layer contains a first phosphor and a second phosphor. The second phosphor has a higher thermal conductivity than the first phosphor. In the wavelength conversion layer, a volume of the second phosphor is larger than a volume of the first phosphor. The wavelength conversion layer includes a first portion and a second portion. The first portion is located closer to the substrate than the second portion, and is in direct contact with the second portion. Thicknesses of the first portion and the second portion are equal to each other. A volume V11 of the first phosphor in the first portion, a volume V12 of the second phosphor in the first portion, a volume V21 of the first phosphor in the second portion, and a volume V22 of the second phosphor in the second portion satisfy V11/V12<V21/V22.

Abstract: The invention provides an optical film assembly, a backlight module, and a display device. The backlight module includes a light source emitting at least a first light, a first optical film, and a second optical film laminated to the first optical film, wherein the first optical film includes a functional layer but does not include a base film, the functional layer is a diffusion film, a brightness enhancement film, a reflection film, or a prism film, and the second optical film is a light conversion layer, the light conversion layer receives the first light and converts the first light to at least a second light to emit, such that a light emission angle of the backlight module matches a requirement of wide viewing angle. The invention could broaden the light emitting angle of the backlight module to make the display device with the backlight module achieve wide viewing angle.

Abstract: A lamp is provided that includes a glass tube body composed of a glass composition that includes an optical diffusive agent to increase the light diffusivity of the glass tube body. The lamp can include a glass tube body having a perimeter defined by a sidewall of the glass tube body for enclosing a hollow interior. The glass tube body is composed of a sodium silicate glass including an optically diffusive agent that is alloyed with a silicate base glass composition. The optically diffusive agent can be selected from lithium borosilicate, titanium dioxide, antimony trioxide or combinations thereof. The lamp can further include at least one light emitting diode (LED) on a substrate that provides the light source. The at least one light emitting diode (LED) that is present on the substrate is positioned within the hollow interior of the glass tube body.

Abstract: An illumination light source emits white light resulting from mixing of light emitted from an LED chip and light emitted from a plurality of phosphors. A light emission spectrum of the white light has a peak in a wavelength range from 430 nm to 460 nm. In the light emission spectrum, a proportion of optical intensity at a wavelength of 510 nm relative to optical intensity at the peak is 0.45 or more, and a proportion of optical intensity at a wavelength of 580 nm relative to the optical intensity at the peak is 0.60 or more. Furthermore, in the light emission spectrum, a proportion of optical intensity at a wavelength of 650 nm relative to the optical intensity at the wavelength of 580 nm is 0.4 or less.

Abstract: A light emitting device includes a light emitting element adapted to emit blue light, quantum dots that absorb part of the blue light emitted from the light emitting element to emit green light, and at least one of a KSF phosphor adapted to absorb part of the blue light emitted from the light emitting element to emit red light and a MGF phosphor adapted to absorb part of the blue light emitted from the light emitting element to emit red light.

Abstract: This disclosure relates to an OLED display apparatus and the preparation method thereof. The OLED display apparatus comprises, from the bottom to the top, a substrate, an OLED device, a thin film inner layer, an ethylcellulose layer, and a thin film outer layer. By adding a hydrophobic ethylcellulose layer with a photosensitive material and a singlet oxygen receptor dissolved therein on the basis of current thin film packaging, this invention can have the functions of water vapor barrier and oxygen absorption so as to improve the service life of devices.

Abstract: An object of the present invention is to provide a light-emitting device that can implement a natural, vivid, highly visible and comfortable appearance of colors and appearance of objects as if the objects are seen outdoors, and to provide a light-emitting device that can change the appearance of colors of the illuminated objects so as to satisfy the requirements for various illuminations, and a method for designing thereof. Another object of the present invention is to improve the appearance of colors of a light-emitting device which currently exists or is in use, and which includes a semiconductor light-emitting device of which appearance of colors is not very good. Moreover, another object of the present invention is to provide a method for driving the light-emitting device, an illumination method by the device, and a method for manufacturing the light-emitting device.

Abstract: The present invention discloses a nitroxide fluorescent powder comprising an inorganic compound containing M, A, B, O, N, and R elements; in which the M element is at least one of Ca, Sr, Ba, Mg, Li, Na, and K, the A element is at least one of B, Al, Ga, and In, the B element is at least one of C, Si, Ge, and Sn, the R element is at least one of Ce, Eu, Lu, Dy, Gd, and Ho, characterized in that the inorganic compound forms a crystal in a crystalline phase, and the oxygen atom content in the crystal in a crystalline phase is in an increasing structural distribution from a core to surface of the crystal. The nitroxide fluorescent powder and the nitroxide illuminant of the present invention have the advantages of good chemical stability, good aging and light decay resistance, and high luminescent efficiency, and are useful for various luminescent devices. The preparation method of the present invention is easy and reliable and useful for industrial mass production.

Abstract: The phosphor has a broad excitation band provided by Ce3+ in an excitation spectrum. The excitation band has a peak in a range between 400 nm and 470 nm inclusive. The phosphor has, as an emission spectrum, a broad emission component provided by Ce3+ which has an emission peak wavelength of 510 nm or more to less than 570 nm and a linear emission component provided by Tb3+ which has an emission peak wavelength of 535 nm or more to less than 560 nm. The intensity of the emission spectrum shows the maximum at the wavelength of the linear emission component provided by Tb3+.

Abstract: The present disclosure relates generally to a backlit luminous structure. The backlit luminous structure includes a substrate, such as a two dimensional or three dimensional object or surface, an ultraviolet emitting electroluminescent coating or other type of UV emitting coating that emits ultraviolet wavelengths when activated, and an ultraviolet activated luminous coating applied on the ultraviolet emitting electroluminescent coating. When activated, the ultraviolet emitting electroluminescent coating generates ultraviolet wavelengths that aviate the luminous coating. The backlit luminous structure may be used in a variety of applications, such as, but not limited to, theme parks, amusement attractions, or the like.

Abstract: A light conversion plate including a first glass substrate; a light conversion layer disposed on the first glass substrate and including quantum dots that convert incident light into light having a specific wavelength range; and a second glass substrate disposed on the light conversion layer. Further, a surface of at least one of the first glass substrate and the second glass substrate includes a plurality of protrusion patterns.

Abstract: The present invention provides an oxynitride silicate fluorescent substance capable of output a light having a high luminance even when irradiated by an exciting light having a high energy density. The present invention is a yellow fluorescent substance represented by a chemical formula (Ba1-x-y-z,Srx)aSibOcNd:Eu2+y,Y3+z (0.9?a?1.1, 1.9?b?2.1, 1.9?c?2.1, 1.9?d?2.1, 0?x?1, 0<y<0.01, and 0?z<0.01).

Abstract: A mercury-free low-pressure lamp having a bulb is provided. The bulb includes a non-mercury emissive material. When the bulb is in a non-operational state, the emissive material condenses into a liquid or solid, and when the bulb is in an operational state the emissive material forms an emitter, the emitter in combination with one or more gases generate photons when excited by an electrical discharge.

Abstract: A reaction material for a chemical heat pump includes type III anhydrous gypsum, a magnesium compound, and CaxMg1-xSO4. The reaction material for the chemical heat pump structurally changes between a compound including type III anhydrous gypsum, the magnesium compound, and CaxMg1-xSO4, and a compound including hemihydrate gypsum, a hydrate of the magnesium compound, and a hydrate of CaxMg1-xSO4 when subjected to heat storage process and heat release process. x is 0<x<1.

Abstract: Metal nano particles doped with silicate luminescent materials and preparation methods thereof are provided. The luminescent materials are represented by the general formula: (Sr1-x-yAxEuy)3SiO5:Dz@Mn, wherein A is one or two selected from alkaline-earth metal elements, D is F or Cl, @ is for coating, M is one or two selected from Ag, Au, Pt, Pd or Cu metal nano particles, 0?x?0.5, 0.001<y?0.15, and 0?z?0.5. n is a molar ratio of metal nano particles to the silicon element, wherein 0<n?0.01. Compared to the luminescent materials in the art, the said luminescent materials have higher internal quantum efficiency, luminous intensity and stability, therefore they are appropriate to be used in coating technique and improve the visual effect.

Abstract: The present invention provides a white light source comprising a blue light emitting LED having a light emission peak of 421 to 490 nm and satisfying a relational equation of ?0.2?[(P(?)×V(?))/(P(?max1)×V(?max1))?(B(?)×V(?))/(B(?max2)×V(?max2))]?+0.2, assuming that: a light emission spectrum of the white light source is P(?); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(?); a spectrum of a spectral luminous efficiency is V(?); a wavelength at which P(?)×V(?) becomes largest is ?max1; and a wavelength at which B(?)×V(?) becomes largest is ?max2. According to the above white light source, there can be provided a white light source capable of reproducing the same light emission spectrum as that of natural light.

Abstract: A mixed light source comprising: a first radiation source, which emits radiation in the red spectral range; an excitation source, which contains a III-V semiconductor material; and a conversion substance, which, during the operation of the mixed light source, converts the radiation of the excitation source at least partly into radiation whose color locus in the CIE chromaticity diagram lies within a polygon spanned by the coordinates (0.1609; 0.497), (0.35; 0.6458), (0.558; 0.444) and (0.453; 0.415).

Abstract: Disclosed herein is a quantum dot phosphor for light emitting diodes, which includes quantum dots and a solid substrate on which the quantum dots are supported. Also, a method of preparing the quantum dot phosphor is provided. Since the quantum dot phosphor of the current invention is composed of the quantum dots supported on the solid substrate, the quantum dots do not aggregate when dispensing a paste obtained by mixing the quantum dots with a paste resin for use in packaging of a light emitting diode. Thereby, a light emitting diode able to maintain excellent light emitting efficiency can be manufactured.

Abstract: A thermoelectric material includes a semiconductor substrate, a semiconductor oxide film formed on the substrate, and a thermoelectric layer provided on the oxide film. The semiconductor oxide film has a first nano-opening formed therein. The thermoelectric layer has such a configuration that semiconductor nanodots are piled up on or above the first nano-opening so as to form a particle packed structure. At least some of the nanodots each have a second nano-opening formed in its surface, and are connected to each other through the second nano-opening with their crystal orientation aligned. The thermoelectric material is produced through steps of oxidizing the substrate to form the semiconductor oxide film thereon, forming the first nano-opening in the oxide film, and epitaxially growing to pile up the plurality of nanodots on the first nano-opening. As a result, it is possible to provide the thermoelectric material superior in thermoelectric conversion performance.

Abstract: A fluorescent lamp is provided including a phosphor blend comprising less than about 10% by weight rare earth phosphor, based on the total weight of the phosphor composition. This phosphor blend, when coated on a lamp, provides a lamp that exhibits high color rendering index (CRI), of at least 87, while simultaneously achieving low CCT, of less than about 4500K, i.e. of between about 3000K and 4500K. The phosphor system provided includes a non-rare earth strontium red broad band phosphor, a non-rare earth blue broad band halophosphor, and a rare earth-doped green-blue emitting phosphor, more specifically, a combination of SAR and blue-halo non-rare earth phosphors, and less than 20 wt % BAMn phosphor, based on the total weight of the phosphor system.

Abstract: A lamp having improved color quality scale is provided. The lamp has a light-transmissive envelope and a phosphor layer comprising a first phosphor and a second phosphor wherein the first phosphor has an emission band with a maximum between 590 nm and 670 nm and the second phosphor has an emission band with a maximum between 520 nm and 570 nm. The light generated by the phosphor layer, when the lamp is energized, has delta chroma values for fifteen color samples of the color quality scale within select parameters. The delta chroma values are measured in the CIE LAB color space.

Abstract: Coating systems suitable for use in fluorescent lamps, particularly as scattering agents within a UV-reflecting coating for the purpose of improving fluorescent lamp luminosity. Such a coating system is provided on a transparent or translucent substrate and includes a phosphor coating and a scattering agent that scatters UV rays. The scattering agent includes an inorganic powder present in a separate UV-reflecting layer adjacent the phosphor coating and/or dispersed in the phosphor coating so that the scattered UV rays are absorbed by the phosphor coating and cause the phosphor coating to emit visible light. The inorganic powder exhibits low or no absorption to UV rays having wavelengths of 185 nm and 254 nm and is not reactive with mercury.

Abstract: Excimers are formed in a high pressure gas by applying a potential between a first electrode (14, 214) and a counter electrode (25, 226) so as to impose an electric field within the gas, or by introducing high energy electrons into the gas using an electron beam. A phosphor for converting the wavelength of radiation emitted from the formed excimers is disposed within the gas and outside a region (62, 162) where the excimers are expected to be formed, so as to avoid degradation of the phosphor.

Abstract: The invention relates to coated phosphor particles comprising luminescent particles and at least one, preferably substantially transparent, metal, transition-metal or semimetal oxide coating, and to a process for the production thereof.

Abstract: A lighting unit emits light with an intensity in the wavelength from 430 to 510 nm that is maximum at 460 nm and minimum in the range from 490 to 500 nm, an intensity in the wavelength from 510 to 600 nm that is maximum in the range from 530 to 545 nm and minimum in the range from 570 to 580 nm, and an intensity in the wavelength of 600 nm or greater that is maximum in the range from 620 to 640. The lighting unit illuminates meat with light having a feeling of contrast index (FCI) of 135 to 145 and the illuminated meat has a metric hue angle from 54 to 56 and a color shift Duv from 0 to 5.

Abstract: A mercury-free low-pressure lamp having a bulb is provided. The bulb includes an emissive material and one or more phosphors. The emissive material includes at least one of an alkali metal or an alkaline earth metal, wherein when the bulb is in a non-operational state, the emissive material condenses into a liquid or solid, and when the bulb is in an operational state the emissive material forms an emitter, the emitter in combination with one or more gases generate photons when excited by an electrical discharge. The one or more phosphors are configured to convert at least a portion of the photons to other visible wavelengths.

Abstract: The invention provides a lighting unit (100) comprising (1) a vacuum ultraviolet (VUV) radiation based source of radiation (10) configured to generate VUV radiation (11), and (2) a luminescent material (20) configured to convert at least part of the VUV radiation into visible luminescent material light (21), wherein the luminescent material comprises a trivalent praseodymium containing material selected from the group consisting of (Zr1-x-yHfxPry)(Si1-yPy)04, (Zr1-x-yHfxPry)3((P1-3/4yS3/4y)04)4, and (Zr1-x-yHxPry)3((B1-3/4yX3/4y))O3)4, with x in the range of 0.0-1.0 and y being larger than 0 and being equal to or smaller than 0.15.

Abstract: A fluorophor which comprises as a main component, an ? type sialon crystal containing at least Li, A element (wherein A represents one or more elements selected from among Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm and Yb), M element (wherein M represents one or more metal elements except Li and the A element), Si, Al, oxygen and nitrogen. The fluorophor has an a type sialon crystal structure which is represented by the general formulae: (Lix1, Ax2, Mx3)(Si12?(m+n)Alm+n)(OnN16?n) 1.2?x1?2.4 (1) 0.001?x2?0.4 (2) and 0?x3?1.0 (3), and has a luminescence peak at a wavelength in the range of 400 to 700 nm. The above phosphor is reduced in the lowering of brightness, and can be suitably used for a white LED and the like.