278results about How to "Low color temperature" patented technology

A photonic structure for “white” light generation by phosphors under the excitation of a LED. The photonic structure mounts the LED and an optically transparent nanocomposite matrix having dispersed therein phosphors which will emit light under the excitation of the radiation of the LED. The phosphors dispersed in the matrix may be nanocrystalline, or larger sized with the addition of non light emitting, non light scattering nanoparticles dispersed within the matrix material so as to match the index of refraction of the matrix material to that of the phosphors. The nanocomposite matrix material may be readily formed by molding and formed into a variety of shapes including lenses for focusing the emitted light. A large number of the photonic structures may be arranged on a substrate to provide even illumination or other purposes.

Light emitting diodes are prepared with specialized packages which provide a dosing feature with respect to a phosphor wavelength converting medium. Elements of the device package form a specially shaped cavity when coupled together. The shape and size of the cavity operates to control the dosing of phosphor spiked medium of soft gel. The gel fills the cavity such that light emitted from a semiconductor die is exposed to a similar cross section independent of the exact direction of light propagation. In this way, 'white' LED systems are formed from blue emitting diodes as highly controlled phosphor dosing permits precise amounts of blue light to be converted to yellow light without problems with angular uniformity observed in competing technologies.

An apparatus for reducing vertical segregation of a discharge lamp. A current / voltage input sweeps through a frequency range between the first azimuthal acoustic resonance mode and a first radial acoustic resonance mode of the discharge lamp. The current / voltage input is subsequently amplitude modulated. Alternatively, without amplitude modulation, the current / voltage input sweeps through the frequency range for a first portion of the period, and then for a second portion of the period drops to a relatively constant frequency.

The disclosure provides a dominant wavelength stabilized white light emitting device and a method for stabilizing dominant wavelength of a white-light light emitting device. The light emitting device includes light-emitting diode chips, a phosphor resin layer disposed above the diode chip, and an optical filter disposed above the resin with a gap interposed between the phosphor resin layer and the optical filter. The phosphor resin layer contains a phosphor that is excited by light of the first wavelengths to emit light of second wavelengths. The optical filter reflects light of wavelength shorter than the peak wavelength and transmitting light of the second wavelengths with a modulated transmittance in a range of the first wavelengths.

A light-emitting device includes a light-emitting element emitting primary light and a wavelength conversion portion absorbing a part of the primary light and emitting secondary light having a wavelength equal to or longer than the wavelength of the primary light. The wavelength conversion portion includes a plurality of green or yellow light-emitting phosphors and a plurality of red light-emitting phosphors. The green or yellow light-emitting phosphor is implemented by at least one selected from a specific europium (II)-activated silicate phosphor (A-1) and a specific cerium (III)-activated silicate phosphor (A-2). The red light-emitting phosphor is implemented by a specific europium (II)-activated nitride phosphor (B). The light-emitting device emitting white light at efficiency and color rendering property higher than in a conventional example can thus be provided.

The illumination device disclosed in the present specification has a light source, a touchless sensor for detecting proximity and movement of an object without contact, and a control unit for controlling the driving of the light source on the basis of an output of the touchless sensor.

An optically reliable high refractive index (HRI) encapsulant for use with Light Emitting Diodes (LED's) and lighting devices based thereon. This material may be used for optically reliable HRI lightguiding core material for polymer-based photonic waveguides for use in photonic-communication and optical-interconnect applications. The encapsulant includes treated nanoparticles coated with an organic functional group that are dispersed in an Epoxy resin or Silicone polymer, exhibiting RI˜1.7 or greater with a low value of optical absorption coefficient α<0.5 cm−1 at 525 nm. The encapsulant makes use of compositionally modified TiO2 nanoparticles which impart a greater photodegradation resistance to the HRI encapsulant.

A phosphor material is presented that includes a blend of a first phosphor, a second phosphor and a third phosphor. The first phosphor includes a composition having a general formula of ((Sr1−zMz)1−(x+w)AwCex)3(Al1−ySiy)O4+y+3(x−w)F1−y−3(x−w), wherein 0<x≦0.10, 0≦y≦0.5, 0≦z≦0.5, 0≦w≦x, A comprises Li, Na, K, or Rb; and M comprises Ca, Ba, Mg, Zn, or Sn. The second phosphor includes a complex fluoride doped with manganese (Mn4+), and the third phosphor include a phosphor composition having an emission peak in a range from about 520 nanometers to about 680 nanometers. A lighting apparatus including such a phosphor material is also presented. The light apparatus includes a light source in addition to the phosphor material.

The invention relates to a semitransparent fluorescent powder / glass composite luminescent ceramic wafer and a preparation method thereof. The semitransparent fluorescent powder / glass composite luminescent ceramic wafer is obtained by carrying out 'pelletizing, compression moulding and sintering' on fluorescent powder and low-melting-point glass powder, wherein content of the fluorescent powder is 30-85wt%, and the content of the low-melting-point glass powder is 70-15wt%. The preparation method of the semitransparent fluorescent powder / glass composite luminescent ceramic wafer comprises the following steps: firstly, uniformly mixing fluorescent powder with glass powder in certain proportion, and adding a binding agent required by pelletizing and demoulding, so that pelletized powder of 60-100 meshes is obtained; secondly, carrying out compression moulding on the obtained pelletized powder by virtue of a mould, so that a green body of a certain shape is obtained; thirdly, carrying out heat treatment, namely carrying out glue drainage on the green body for 2-4 hours at the temperature of 300-395 DEG C, and sintering for 1-2 hours at the temperature of 395-410 DEG C, wherein the whole heat treatment process is carried out in the air atmosphere; and finally the fluorescent powder / glass composite luminescent ceramic wafer is obtained.

A polarized white light emitting diode provides a polarized white light to decrease glare, and increase the extinction ratio. A LED chip is disposed in a cavity between a reflection substrate and a metallic wire-grid polarizing layer, and emits a first color light. The metallic wire-grid polarizing layer is disposed under and in contact with a transparent substrate. A phosphor layer covers over the LED chip, and is disposed in the cavity with an air gap between the phosphor layer and the metallic wire-grid polarizing layer. A second color light is generated by the first color light. The metallic wire-grid polarizing layer multiply reflects a portion of first color light in plural directions in the cavity to produce secondary excitations. The polarized white light transmits through the metallic wire-grid polarizing layer by mixing a portion of first color light with the second color light excited by the first color light.

A user interface, a method, and a computer program product are provided for enabling a user to voice control over at least one setting of an apparatus such as a lighting system. The user interface determines a characteristic of an audio signal converted from vocal input of a user. A first setting of the apparatus is adjusted proportionally to a variation in the characteristic. Another setting of the apparatus may be adjusted on the basis of another characteristic of the audio signal. As a result, the user interface enables the user to control a lighting system over a substantially large or continuous range of output.

The invention discloses an anti-glare flame-retardant polycarbonate material which comprises the following components by weight percent: 85-95 percent of polycarbonate, 2-12 percent of flame retardant, 0.1-1 percent of flame-retardant synergist, 0.1-5 percent of anti-glare agent, 0.3-2 percent of anti-ultraviolet agent, 0.05-3 percent of blue light absorbent, 0.2-3 percent of antioxidant and 0.2-2 percent of lubricating agent. The anti-glare flame-retardant polycarbonate material not only has an excellent anti-glare function, but also has higher light transmittance, and is capable of absorbing the blue wave band of the LED lighting spectrum at the same time. The invention further discloses a preparation method of the anti-glare flame-retardant polycarbonate material, which comprises the following steps: firstly preparing flame-retardant masterbatches, organic silicon microbead anti-glare masterbatches and blue light absorption masterbatches, and then preparing the anti-glare flame-retardant polycarbonate material, so that the performance anti-glare flame-retardant polycarbonate material is improved. The anti-glare flame-retardant polycarbonate material is particularly suitable for preparing an optical housing for LED lighting.

The invention discloses a near ultraviolet excited double perovskite single matrix white light fluorescent material and preparation and application thereof. The chemical formula of the double perovskite material meets A<2>B<1-x>C<x>B'<1-y>Ln<y>X<6>, wherein A, B and C are one or combination of more of normal monovalent cations or cationic groups, and A, B and C are different from one another; B' is one or combination of more of Al, Bi, In normal trivalent cations or cationic groups; and Ln is one or combination of more of various kinds of normal trivalent rare earth elements. The double perovskite material can particularly be applied for serving as white light fluorescent materials. Formation of two sorts of B-site elements of the double perovskite is improved, part of B is replaced with C, part of B' is replaced with rare earth element Ln, and by controlling and replacing the corresponding mole fraction x and y, the near ultraviolet excited double perovskite single matrix white lightfluorescent material is accordingly obtained. Compared with YAG (yttrium aluminum garnet):Ce<3+>, the near ultraviolet excited double perovskite single matrix white light fluorescent material is widerin emission spectrum range, simple to prepare, and particularly suitable for being applied to white light LED (light-emitting diode) devices.

Compositions of matter comprising a seeded semiconductor nanoparticle material and a non-quantum confined phosphor particle material for use in light conversion and light conversion layers comprising such compositions. In various embodiments, spherical core / shell seeded nanoparticles (SNPs) or nanorod seeded nanoparticles (RSNPs) are combined with a phosphor material to provide a composition of matter with small re-absorbance of the phosphor emission in both green and red wavelength regions and small re-absorbance of the SNP emission, In some embodiments, the SNPs or RSNPs are encapsulated in a first host material before being mixed with the phosphor particles. In various embodiments, a SNP / RSNP-phosphor mixture or encapsulated SNP / RSNP-phosphor mixture is incorporated in host matrix.

An incandescent lamp color light emitting diode lamp comprises a semiconductor blue light emitting diode chip having a center emission wavelength in a range of from 400 nm to 480 nm and a phosphor that absorbs light emitted from the diode chip to emit light having a different wavelength than the light emitted from the diode chip. The phosphor is represented by a general formula of Mp(Si, Al)12(O, N)16:Eu2+q. The main phase is an α-SiAlON phosphor having an α SiAlON structure, wherein M is at least one element of Ca, Y, Mg, Li, Sc, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sr and p is from 0.75 to 1.0; and q is between 0.02 and 0.09. The diode lamp emits light having an emission color produced by a mixture of the light emitted from the semiconductor blue light emitting and the light emitted from the α-SiAlON. The chromaticity range thereof falls within the range defined by chromaticity coordinates (x, y) of (0.4775, 0.4283), (0.4594, 0.3971), (0.4348, 0.4185), and (0.4214, 0.3887) on the XYZ chromaticity diagram.

The embodiment of the invention provides an eyesight protecting method and an eyesight protecting device. The eyesight protecting method comprises the following steps: when a screen of terminal equipment begins to be lightened up, recording an appointed parameter in real time; when the appointed parameter surpasses a preset threshold value, gradually reducing the color temperature of the screen until the screen turns off. In the embodiment of the invention, when a user watches the screen, if a certain parameter surpasses the threshold value (for example, the lighting duration of the screen surpasses a duration threshold value, or the blinking frequency of the user surpasses a frequency threshold value), the conclusions that the eyes of the user begin to feel tired and the color temperature of the screen is required to be adjusted are drawn, so that the color temperature of the screen is gradually reduced, for example, the color temperature of the screen is reduced to a certain extent at the set time intervals so as to gradually reduce blue rays, harmful to the eyes, emitted by the screen, and the user is gradually adapted to change in the color temperature imperceptibly, thereby fulfilling the aim of protecting eyesight.

The invention provides a light green goggle lens for prevention of an electronic luminescent screen hurts. The lens is composed of a substrate and an evaporation coating film layer, wherein the substrate contains a short-wave visible light absorbing agent and is made of organic high-molecular polymers containing an ultraviolet absorbing agent. The lens can almost completely absorb ultraviolet rays and high-energy purple and blue visible light which are emitted by the electronic luminescent screen, hurts of ultraviolet rays and short-wavelength photons to retinas are avoided, simultaneously, almost no color difference exists, and the lens has the low color temperature, so that eyes are in the environment close to the nature, the normal growth and development of retina photosensory cells are not influenced and hurt, and the lens is applicable to growing youngsters.

The invention relates to ball-shaped red-enhanced phosphor used in white light LEDs, and a preparation method thereof. The structural formula of the phosphor is: YxREyMzCemAl5-nAnO12, wherein RE is at least one among Tb, Gd, Sm, Yb, La, and Lu; M is at least one among Mg, Ba, Ca, and Sr; A is at least one among Ga, Cu, Zn, Ni, Ge, and Si; 1.8<x<3; 0<=y<=0.8; 0<=z<=0.2; 0<m<=0.2; 2.9<x+y+z+m<3.1; 0<=n<=0.5; and 0<y+z+n<1. The preparation method is that: proper amounts of Y salt, RE salt, M salt, Ce salt, Al salt and A salt are weighed according to the stoichiometric ratio of the elements in the structural formula; the salts are well-mixed with a proper amount of surfactant; a precursor is then prepared with a mechanical solid-phase reaction method or a coprecipitation method; the mixture is processd through vacuum-filtrating and washing; a certain amount of volatile acid is added to the mixture, such that a suspension liquid is prepared; the suspension liquid is then produced into ball-shaped precursor power through spray drying; the ball-shaped precursor power is processed through pre-sintering, and then calcined under a reductive atmosphere, such that target phosphor is obtained. The phosphor provided by the present invention is ball-shaped. Red shifts occur in the emitted wavelength of the phosphor. The phosphor has good color rendering property, and can be effectively excited by blue-light chips.

The application discloses YAG (yttrium aluminum garnet)-type fluorescent powder and preparation method thereof. The YAG-type fluorescent powder comprises R(3-x)Al(5-2y)O12:xCe<3+>, yMn<2+> and yM<4+>, wherein R is selected from at least one of rare earth elements; M<4+> is a valence state compensation ion; x is equal to 0.005-0.2; and y is equal to 0.05-0.4. The preparation method comprises the following steps: mixing all the materials into an organic solvent; calcining in the reducing atmosphere, so as to obtain the YAG-type fluorescent powder. High-quality white light with soft color and high color rendering index can be generated by a YAG-type fluorescent transparent ceramic prepared from the YAG-type fluorescent powder instead of fluorescent powder and an organic resin or silica gel encapsulating material in the existing white light LED (light-emitting diode), and an encapsulating structure, the lighting effect and the stability of an LED light source can be globally optimized.

The invention discloses a red and orange light fluorescent powder with garnet structure. The fluorescent powder has a chemical expression of Mg2-xAxY2-y-cByAl2+z-aCaSi2-z-bDbO12-zEz:cCe<3+>, wherein A represents one or more than two selected from Ba, Sr and Ca in arbitrary proportion, B represents one or more than two selected from Gd, La and Sc in arbitrary proportion, C represents Ga, D represents Ge, E represents F or Cl, x, y,z, a, b and c represent corresponding mole fractions and satisfy the relations of: 0<=x<0.35, 0<=y<0.35, 0<z<=2, 0<=a<0.5, 0<=b<0.35, 0<c<0.2, and 2-z-b>=0. Under the excitation of blue light in wavelength of 455nm, the red and orange light fluorescent powder has emission wavelength range of 500-750 nm, wherein the main emission wavelength range is 600-621 nm, the emission spectra shows obvious redshift compared with YAG (delta S=60-80nm), and the preparation temperature is low.

The invention relates to a red fluorophor as well as a carbothermal reduction nitridation preparation method and an application of the red fluorophor. The red phosphor is formed by carrying out solid solution on an activator A in the Ca[1-y]SryAlaSibNcOd substrate having the same crystal structure as that of the CaAlSiN3 crystalline phase, the chemical formula of red phosphor is Ca[1-vx / 2-y]SryAxAlaSibNcOd, wherein x is greater than 0 and less than or equal to 0.2, y is equal to or greater than 0 and less than or equal to 0.8, a is equal to or greater than 0.52 and less than or equal to 1, b is equal to or greater than 1 and less than or equal to 1.36, c is greater than 2.85 and less than or equal to 3 and d is equal to or greater than 0 and less than or equal to 0.2, the element A is at least one element selected from Eu, Mn, Yb, Ce, and Tb and v is representative of the electrovalence of the activator A ion and the preparation method of the red fluorophor comprises the following steps of maintaining CaCO3 powder and / or CaO powders and / or CaC2O4 powder, SrCO3 and / or SrO powder, Si3N4 powder and / or SiO2 powder, AlN powder, and single metal, oxide, nitride, fluoride, chloride, carbonate and / or nitrogen oxide powder of element A as starting materials in the presence of carbon powder as a reducing agent at a mixed atmosphere nitrogen and hydrogen or a mixed atmosphere of nitrogen, hydrogen and ammonia at a temperature range of 1550-1650 DEG C and sintering.

The invention discloses nitrogen oxide fluorescent powder, a preparation method thereof and a luminescent device containing the fluorescent powder. The chemical formula of the fluorescent powder is mM<3-x / 2-d>(N<2-x>,Ox)*aA<1-y / 3>(N<1-y>,Oy)*bD<3-z / 4>(N<4-z>,Oz)*n(SiC):dR, wherein the M element is one or more of Mg, Ca, Sr and Ba; the A element is one or more of B, Al, Ga, La, Gd, Sc and Y; the D element is one or more of Si, Ge and Ti; the R element is one or more of Ce, Eu and Mn, and comprises the Eu certainly; 0<=x<=0.3; 0<=y<=0.3; 0<=z<=0.3; 0

The invention discloses transparent ceramic for the high brightness white light-emitting diode (LED) and a preparation method thereof. The chemical formula of the transparent ceramic is (Y3-x-y-zCexLiyRz)(Al5-nMn)O12, wherein R is at least one of La, Pr, Sm, Gd, Tb and Dy; M is at least one of Sc, Ti, V, Cr and Mn; and x is larger than or equal to 0.003 and less than or equal to 0.06, y is larger than or equal to 0.003 and less than or equal to 0.06, z is larger than or equal to 0 and less than or equal to 0.75, and n is larger than or equal to 0 and less than or equal to 0.75. The raw material powder prepared by the solid-phase ball milling method or wet chemical method is used for preparing the transparent ceramic which has the advantages of fine crystal particle, uniform size and ultralow porosity through moulding, cold isostatic pressing and vacuum sintering. The transparent ceramic has the characteristics of high transmissivity and thermal conductivity, good chemical stability and thermal stability and high fluorescence conversion efficiency.

A semiconductor light-emitting device and a method for manufacturing the same can include a wavelength converting layer located on at least one semiconductor light-emitting chip in order to emit various colored lights including white light. The semiconductor light-emitting device can include a casing having a cavity and a mounting surface, the chip mounted on the mounting surface, a transparent plate mounted on the wavelength converting layer within a top surface of the chip and a reflective layer located in the cavity so as to surround the transparent plate, the wavelength converting layer and the chip. The semiconductor light-emitting device can be configured to improve light-colored variability and light-emitting efficiency of the chip by using the reflective layer as a reflector, and therefore can emit a wavelength-converted light having a substantially uniform color tone and a high light-emitting efficiency from a smaller light-emitting surface than the top surface of the chip.

The invention provides a composite transparent fluorescent ceramic chip and preparing method for white LEDs, the composite transparent fluorescent ceramic chip is the integral structure of two or more small ceramic units connected in the cross section, the small ceramic unit is a light pixel, the light color of the each lighting pixel is more than two, after being excited by the LED chip, the composite transparent fluorescent ceramic chip emits white light. Compared with the existing technology, the different lighting pixel points are compound on the same ceramic chip according to the principle that the three base colors of red light, blue light and green light are mixed into white light, the problem of uneven dispersion of phosphor particles in organic materials, the scattering of surface light and the loss of red components, and the like are overcome, the technical scheme has the advantages of high conversation efficiency, high color index, long life, good heat stability and adjustable color temperature.

The invention discloses a quantum dot fluorescent material, which is prepared from the following raw materials of: by weight, 0.01-35 parts of a fluorescent material, 60-90 parts of a resin, and 2-35 parts of a filling material, wherein the fluorescent material comprises quantum dots or a compound of quantum dot and non-quantum dot fluorescent materials. Correspondingly, the invention discloses a preparation method of the above quantum dot fluorescent material. In addition, the invention also discloses a LED fill / flash lamp, which is prepared by steps of: coating the quantum dot fluorescent material on the surface of an unpacked LED chip, curing and packaging. According to the invention, the quantum dot fluorescent material and the LED fill / flash lamp prepared by the utilization of the quantum dot fluorescent material have characteristics of high color rendering index, low color temperature and strong luminous efficiency. By the adoption of the material and the lamp, color trueness of images acquired by image acquisition equipment can be substantially raised.

The invention discloses a Mn<4+>-doped red light-emitting material and a preparation method thereof as well as a novel lighting source, and belongs to the field of a preparation method of fluorescent materials. The light-emitting material has a structural formula A[14-y]B6C[10-x]O35:xMn<4+>,yM<3+>, wherein in the formula, A represents one or two of alkaline-earth metal Ca, Sr or Ba; B represents one or two of Zn and Mg; C represents one or more of Al, Ga or In; M<3+> represents Sc, Y, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu; x is greater than or equal to 0.005 and less than or equal to 1; y is greater than or equal to 0 and less than or equal to 2. The invention further provides the preparation method of the Mn<4+>-doped red light-emitting material and the obtained novel lighting source. The Mn<4+>-doped red light-emitting material can be used for emitting red light in a wavelength range within 650nm to 750nm when being excited by excitation light sources such as ultraviolet light, near ultraviolet light or blue light.

The disclosure provides a dominant wavelength stabilized white light emitting device and a method for stabilizing dominant wavelength of a white-light light emitting device. The light emitting device includes light-emitting diode chips, a phosphor resin layer disposed above the diode chip, and an optical filter disposed above the resin with a gap interposed between the phosphor resin layer and the optical filter. The phosphor resin layer contains a phosphor that is excited by light of the first wavelengths to emit light of second wavelengths. The optical filter reflects light of wavelength shorter than the peak wavelength and transmitting light of the second wavelengths with a modulated transmittance in a range of the first wavelengths.

The invention relates to an organic electroluminescence device capable of simulating sunlight and a preparation method thereof, belonging to the technical field of electroluminescence devices. The device comprises a substrate, an anode, a cathode and an organic function layer arranged between the anode and the cathode, wherein the organic function layer comprises a blue fluorescent layer, a phosphor coating and a spacer layer, wherein the blue fluorescent layer and the phosphor coating are separated by the spacer layer; the blue fluorescent layer is made of a non-doped luminescent material with the light-emitting wavelength of smaller than 500nm; the phosphor coating comprises a red phosphor coating, wherein the red phosphor coating is made of a non-doped luminescent material with the light-emitting wavelength of greater than 585nm; and the spacer layer is formed by at least one of hole-type organic semiconductor materials whose hole mobility is greater than electronic mobility. The organic electroluminescence device has a CCT (Correlated Color Temperature) feature of the sunlight and can be prepared through a non-doped technology, and furthermore, the organic electroluminescence device has the advantages of simple structure and low requirements for the preparation process.

The invention provides a remote phosphor structure applicable to LED lighting and a production method thereof. The remote phosphor structure applicable to LED lighting comprises a light-permeable support part and a phosphor layer arranged on the same. The phosphor layer at least comprises first-wavelength phosphor and second-wavelength phosphor. The first-wavelength phosphor forms a first phosphor layer. The second-wavelength phosphor forms a second phosphor layer. The first phosphor layer and the second phosphor layer are stacked on the light-permeable support part layer by layer. The production method includes producing at least two layers of phosphor different in wavelength on the light-permeable support part. By the design of the phosphor layers, multi-wavelength layering-stacked structure or multi-wavelength array structure, multispectral emergence is achieved, color rendering is improved, color temperature is lowered, and luminous efficiency of the phosphor is guaranteed.