343results about How to "High emission intensity" patented technology

To provide a phosphor having an emission spectrum with a broad peak in a range from green color to yellow color, having a broad and flat excitation band capable of using lights of broad range from near ultraviolet/ultraviolet to blue lights as excitation lights, and having excellent emission efficiency and luminance. The problem is solved by providing the phosphor expressed by a general composition formula MmAaBbOoNn:Z (where element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kinds of elements acting as the activator.), satisfying 4.0<(a+b)/m<7.0, a/m≧0.5, b/a>2.5, n>o, n=2/3 m+a+4/3 b−2/3 o.

To provide a phosphor having a broad emission spectrum with a peak in the range from yellow color to red color (wavelength from 570 nm to 620 nm), having a flat excitation band with large area on the long wavelength side from near ultraviolet/ultraviolet to green color (wavelength from 250 nm to 550 nm), and excellent in emission intensity and luminance, and a method of manufacturing the same, and also a light source such as white LED using the phosphor. As raw materials, Ca₃N₂(2N), AlN(3N), Si₃N₄(3N), and Eu₂O₃(3N) are prepared, and out of each raw material, 0.950/3 mol of Ca₃N₂. 2 mol of AlN, 4/3 mol of Si₃N₄, and 0.050/2 mol of Eu₂O₃ are weighed, and the raw materials thus weighed are mixed by using a mortar. The raw materials thus mixed are put in a BN crucible, and retained/fired for 3 hours at 1700° C. in a nitrogen atmosphere, and thereafter cooled from 1700° C. to 200° C., to thereby obtain the phosphor expressed by a composition formula

Ca_0.950Al₂Si₄O_0.075N_7.917:Eu_0.050.

To provide a phosphor having an emission spectrum with a broad peak in a range from yellow color to red color (580 nm to 680 nm) and an excellent excitation band on the longer wavelength side from near ultraviolet/ultraviolet of excitation light to visible light (250 nm to 550 nm), and having an improved emission intensity. The phosphor is provided, which is given by a general composition formula expressed by MmAaBbOoNn:Z, (wherein element M is more than one kind of element having bivalent valency, element A is more than one kind of element having tervalent valency selected from the group consisting of Al, Ga, In, Tl, Y, Sc, P, As, Sb, and Bi, element B is more than one kind of element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is more than one kind of element selected from rare earth elements or transitional metal elements, satisfying m>0, a>0, b>0 o≧0, and n=2/3m+a+4/3b−2/3o), and further containing boron and/or fluorine.

To provide a phosphor having a broad emission spectrum in a range of blue color (in a peak wavelength range from 400 nm to 500 nm), having a broad flat excitation band in a near ultraviolet/ultraviolet range, and having excellent emission efficiency and emission intensity/luminance. The phosphor is given as a general composition formula expressed by MmAaBbOoNn:Z, (where element M is the element having bivalent valency, element A is the element having tervalent valency, element B is the element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is more than one kind of element acting as an activator), satisfying 5.0<(a+b)/m<9.0, 0≦a/m≦2.0, 0≦o≦n, n=2/3m+a+4/3b−2/3o, and has an emission spectrum with a maximum peak in the wavelength range from 400 nm to 500 nm under an excitation of the light in a wavelength range from 250 nm to 430 nm.

The invention relates to an infrared-excited oxide up-conversion luminescence piezoelectric material of a bismuth lamellar perovskite-like structure and a preparation method thereof. The up-conversion luminescence piezoelectric material has a chemical general formula of Am-1-x-RxYbyBi2BmO3M<+3>, wherein R is selected from Er<3+>, Ho<3+> and Tm<3+>, A is selected from Bi<3>, Ca<2+>, Sr<2+>, Ba<2+>, Pb<2+>, Na<+>, K<+>, La<3+> and Y<3+>, B is selected from Ti<4+>, Zr<4+>, Nb<5+>, Ta<5+>, W<6+> and Mo<6+>, m is a positive integer not smaller than 2 and not more than 8, x is not smaller than 0.000001 and not more than 0.3, and y is not smaller than 3.0 and not more than 0.6. The up-conversion luminescence piezoelectric material is prepared by adopting a solid-phase reaction method, has the characteristics of good thermal stability, good chemical stability, easiness for synthesis, high luminous intensity and adjustable color, and can be widely applied to various aspects such as three-dimensional display, infrared detection, counterfeiting prevention, solar cells and photoelectric integration, micro-electro-mechanical systems, photoelectric sensing and the like.

An organic light-emitting device cutting off ambient light while keeping emission intensity includes a pair of first and second electrodes opposed to each other; and a plurality of organic semiconductor layers layered and disposed between the first and second electrodes, wherein the organic semiconductor layers include an organic light-emitting layer, the organic semiconductor device further comprising a light-scattering layer layered and disposed between the organic light-emitting layer and at least one of the first and second electrodes. The light-scattering layer includes: organic materials having carrier injection and transport characteristics of transporting electrons and/or holes; and plural particles dispersed among the organic materials so that light emitted from the organic light-emitting layer is passed therethrough.

To provide a phosphor having an emission spectrum with a broad peak in a range from green color to yellow color, having a broad and flat excitation band capable of using lights of broad range from near ultraviolet/ultraviolet to blue lights as excitation lights, and having excellent emission efficiency and luminance. The problem is solved by providing the phosphor expressed by a general composition formula MmAaBbOoNn:Z (where element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kinds of elements acting as the activator.), satisfying 4.0<(a+b)/m<7.0, a/m=0.5, b/a>2.5, n>o, n=2/3m+a+4/3b−2/3o, and having an emission spectrum with a peak wavelength of 500 nm to 650 nm when excited by light in a wavelength range from 300 nm to 500 nm.

Light emitting diodes are disclosed that utilize multiple conversion materials in the conversion process in order to achieve the desired emission color point. Different embodiments of the present invention can comprise different phosphor types in separate layers on, above or around one or a plurality of LED chips to achieve the desired light conversion. The LEDs can then emit a desired combination of light from the LED chips and conversion material. In some embodiments, conversion materials can be applied as layers of different phosphor types in order of longest emission wavelength phosphor first, followed by shorter emission phosphors in sequence as opposed to applying in a homogeneously mixed phosphor converter. The conversion material layers can be applied as a blanket over the LED chips and the area surrounding the chip, such as the surface of a submount holding the LED chips.

To provide a phosphor given by a general composition formula expressed by MmAaBbOoNn:Z, (wherein element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kind of activating agent, satisfying m>0, a>0, b>0, o≧0, and n>0), with a change rate of a ratio of element B atoms to the total numbers of atoms being smaller by 10% or the change rate of oxygen atoms to the total numbers of atoms being smaller by 40% in a range from a particle surface up to depth 2000 nm, having a broad emission spectrum in a range of blue color, having a broad flat excitation band in a range of near ultraviolet/ultraviolet, and having excellent emission efficiency, emission intensity, and luminance.

The present invention provides a substance that is capable of emitting red phosphorescence which is closer to a chromaticity coordinate for red of NTSC standard. The present invention provides an organometallic complex represented by a general formula (1). In the formula (1), R¹ to R³ are individually either hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, or a heterocyclic group. At least of R¹ to R³ represents an electron withdrawing group. M is one of an element of Group 9 and an element of Group 10, and n=2 when the M is an element of Group 9 while n=1 when the M is an element of Group 10. In such an organometallic complex, red phosphorescence with higher visibility which is closer to a chromaticity coordinate for red of NTSC standard can be emitted.

The invention relates to a carbazole hemicyanine fluorescent dye and application thereof. The carbazole hemicyanine fluorescent dye has a structural general formula I, in which R1 and R2 are independently slected from hydrogen and C1-6 alkyl, C1-6 hydroxy instead of alkyl and C1-6 alkoxy; R3 is H or a formaldehyde radical; and Y is a halogen negative ion. The dye provided by the invention has sensitive response to the change of environment viscosity, the influence on the fluorescent property caused by solvent polarities is very little, and the dye has a two-photon property and can detect the environment viscosity by a ratio method. Therefore, the dye provided by the invention can be used for detecting the change of microenvironment viscosity of cells and tissues.

The invention relates to a red double-perovskite fluorescent powder for white-light LEDs and a preparation method of the red double-perovskite fluorescent powder. The red double-perovskite fluorescent powder is characterized by comprising double-perovskite components shown in the following formula: (AA'1-xMex)MgMO<6>, wherein the A is one of Na or K, the A' is one of La or Gd or composition of the La and the Gd, the M is one of W or Mo or composition of the W and the Mo, the Me is one of rare-earth element Eu or Pr, and the x is larger than or equal to 0.005 and is smaller than or equal to 0.5. The fluorescent powder is prepared by means of sol-gel, single-phase double-perovskite oxide powder can be obtained at the lower temperature and in shorter time, mixing of ions or atoms can be realized by active ions of rare earth, test period is short and stability is fine.

The present invention provides a method for manufacturing a group III nitride semiconductor light emitting element, with which warping can be suppressed upon the formation of respective layers on the substrate, a semiconductor layer including a light emitting layer of excellent crystallinity can be formed, and excellent light emission characteristics can be obtained; such a group III nitride semiconductor light emitting element; and a lamp. Specifically disclosed is a method for manufacturing a group III nitride semiconductor light emitting element, in which an intermediate layer, an underlayer, an n-type contact layer, an n-type cladding layer, a light emitting layer, a p-type cladding layer, and a p-type contact layer are laminated in sequence on a principal plane of a substrate, wherein a substrate having a diameter of 4 inches (100 mm) or larger, with having an amount of warping H within a range from 0.1 to 30 μm and at least a part of the edge of the substrate warping toward the principal plane at room temperature, is prepared as the substrate; the X-ray rocking curve full width at half maximum (FWHM) of the (0002) plane is 100 arcsec or less and the X-ray rocking curve FWHM of the (10-10) plane is 300 arcsec or less, in a state where the intermediate layer has been formed on the substrate and where thereafter the underlayer and the n-type contact layer are formed on the intermediate layer; and furthermore the n-type cladding layer, the light emitting layer, the p-type cladding layer, and the p-type contact layer are formed on the n-type contact layer.

An object of the present invention is to provide a light-storing fluorescent spherical powder that exhibits a high emission intensity, emits light for a prolonged time, and has an excellent workability even when it is added to synthetic resin or the like. There is provided a light-storing fluorescent spherical powder that contains an alkaline earth metal aluminate as a main component and a transition metal element such as lanthanoid as an activator, in which the powder comprises a spherical powder. There is further provided a process of manufacturing a light-storing fluorescent spherical powder that includes preparing as a raw material a light-storing fluorescent powder that has been previously synthesized or a light-storing fluorescent precursor powder that has been produced by pre-reaction of a synthetic raw material of a light-storing fluorescent material, and passing the prepared raw material through a region heated to a temperature higher than a melting point of a light-storing fluorescent material, thereby forming the raw material into spherical shape.

A wavelength-converting member with high emission intensity and that is superior in weather resistance and reliability is obtained. There is provided a phosphor on which a cleaning treatment and/or a coating treatment are/is performed is contained in a glass material having a composition of SiO₂: 30 to 50%, Li₂O: 0 to 15%, Na₂O: 0 to 10%, K₂O 0 to 10%, Li₂O+Na₂O+K₂O: 20 to 30%, B₂O₃:5 to 15%. MgO: 0 to 10%, BaO: 0 to 10% , CaO: 0 to 10%, SrO: 0 to 10%, Al₂O₃: 0 to 10%, ZnO: 0 to 15%, TiO₂: 10 to 20%, Nb₂O₅: 1 to 5%, La₂O₃: 0 to 5%, and TiO₂+Nb₂O₅+La₂O₃: 11 to 20% by mole percentage.

The invention provides a novel white light luminescence device. The device comprises an excitation light source and a fluorescent layer configured to the upstream of the excitation light source. The fluorescent layer comprises a fluorescent powder group and a transparent material. The fluorescent powder group comprises a first fluorescent powder which is excited by the excitation light source to emit white light or visible light, and a second fluorescent powder which is simultaneously excited by the excitation light source to emit infrared light. In the invention, a white light color with highphotosynthetic efficiency can be provided, simultaneously, a high-efficient infrared wave band can be provided, and a new application characteristic is provided for an LED illumination light source.

Disclosed is a preparing method for organic white LED illumination light source with high color-rendering index and adjustable color temperature. Four dyes, including blue, green, yellow and red dyes, are selected. Either two dyes are capable of forming into a complementary color. Blue and yellow dyes are mixed in a light-emitting layer of one host material while green and red dyes are mixed in a light-emitting layer of another host material. By utilizing a preparation of a blue fluorescent material collocating with green and red phosphor materials, the host materials of the two color-complementing light-emitting layers are consistent. The host material selected for the light-emitting layer close to a positive pole has good hole-transmission capability while the host material selected for the light-emitting layer close to a negative pole has good electronic transmission capacity. The host material selected by the blue and yellow light layers is of a hole type, while the host material selected by the green and red light layers is of an electronic type. Manufactured is a white illumination light source with high color-rendering index and adjustable color temperature. Specific technical parameters are provided for manufacturing the illumination light source with high color-rendering index and adjustable color temperature.

A blue fluorescent material having excellent durability and a high luminance, especially one emitting a high-luminance light by the action of electron rays. The fluorescent material comprises inorganic crystals having a crystal structure which is an AlN crystalline, AlN polycrystalline, or AlN solid-solution crystalline structure. It is characterized in that the inorganic crystals contain at least europium in solution and have an oxygen content of 0.4 mass % or lower and that the fluorescent material emits fluorescence derived from divalent europium ions upon irradiation with an excitation source. More preferably, the fluorescent material contains a given metallic element and silicon. Also provided are a process for producing the fluorescent material and an illuminator including the blue fluorescent material.

An object of the present invention is to provide a light emitting device which is high in emission intensity and stable, that is to say, a light emitting device in which when an LED or LD having an emission peak at 380 nm to 410 nm is used as an excitation light source of the light emitting device, the emission intensity of a red phosphor does not largely change to some deviation of the emission wavelength of the LED or LD to maintain not only brightness but also a balance at the time when mixed with a blue and green phosphors.

The present invention relates to a light emitting device characterized in that the device comprises a phosphor which has Eu³⁺ as a luminescent center ion, in which a minimum emission intensity within the excitation wavelength range of 380 nm to 410 nm in an excitation spectrum is 65% or more of a maximum emission intensity, and which has an emission efficiency at 400 nm of 20% or more, and a semiconductor light emitting element which emits light in the region from near-ultraviolet light to visible light.

Provided is a chemically and thermally stable phosphor having different emission characteristics than the conventional phosphor and exhibiting high emission intensity if combined with an LED of 470 nm or less. The phosphor of the present invention is represented by a composition formula: M_dA_eD_fE_gX_h (d+e+f+g+h=1; M is one or more kinds of elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb; A is one or more kinds of elements selected from Mg, Ca, Sr, and Ba; D is one or more kinds of elements selected from Si, Ge, Sn, Ti, Zr, and Hf; E is one or more kinds of elements selected from B, Al, Ga, In, Sc, Y, and La; and X is one or more kinds of elements selected from O, N, and F) and parameters d, e, f, g, and h satisfy the predetermined condition.

The invention discloses a functionalized metal-organic framework compounds, complexes formed therefrom, and methods of preparation and use thereof, wherein the molecular formula of the functionalizedmetal-organic framework compound is C36H22N7O4Zn, and the complex is formed by self-assembling tetra(4-(3-(4-carboxyphenyl)-2,3,4-triazole)-phenyl)ethylene as the main ligand, 4-4'-bipyridine as an auxiliary ligand and zinc nitrate. A LIFM-WZ-6 has high fluorescence quantum yield and two-photon absorption cross section, and has the advantages of high emission intensity and stable luminescence performance. A large amount of small cationic dyes can be adsorbed to achieve the purpose of adjusting the luminescence properties by single-photon and two-photon excitation and realize the emission of white light. The LIFM-WZ-6 does not mercury, is non-toxic, non-volatile, easy to recycle, and environmentally friendly; the composite can adsorb different kinds of cationic dyes with different contentsto obtain light emitting complexes with different light colors and luminosity, so that the light colors of the light emitting complexes can be more easily adjusted and the light color conversion can be realized.