825results about How to "High color rendering index" patented technology

A lighting device comprising first and second groups of solid state light emitters, which emit light having dominant wavelength in ranges of from 430 nm to 480 nm and from 600 nm to 630 nm, respectively, and a first group of lumiphors which emit light having dominant wavelength in the range of from 555 nm to 585 nm. If current is supplied to a power line, a combination of (1) light exiting the lighting device which was emitted by the first group of emitters, and (2) light exiting the lighting device which was emitted by the first group of lumiphors would, in an absence of any additional light, produce a sub-mixture of light having x, y color coordinates within an area on a 1931 CIE Chromaticity Diagram defined by points having coordinates (0.32, 0.40), (0.36, 0.48), (0.43, 0.45), (0.42, 0.42), (0.36, 0.38). Also provided is a method of lighting.

A lighting device comprising sources of visible light comprising solid state light emitters and / or luminescent materials emitting three or four different hues. A first group of the sources, when illuminated, emit light of two hues which, if combined, would produce illumination having coordinates within an area on a 1931 CIE Chromaticity Diagram defined by points having coordinates: 0.59, 0.24; 0.40, 0.50; 0.24, 0.53; 0.17, 0.25; and 0.30, 0.12. A second group of the sources is of an additional hue. Mixing light from the first and second groups produces illumination within ten MacAdam ellipses of the blackbody locus. Also, a lighting device comprising a white light source having a CRI of 75 or less and at least one solid state light emitters and / or luminescent material. Also, methods of lighting.

There is provided a lighting device that comprises at least one 600-630 nm solid state light emitter and at least one light source emitting light within an area on a 1931 CIE Chromaticity Diagram defined by a first set of points having x, y coordinates of (0.32, 0.40), (0.36, 0.48), (0.43, 0.45), (0.42, 0.42), (0.36, 0.38), or a second set of points having x, y coordinates of (0.29, 0.36), (0.32, 0.35), (0.41, 0.43), (0.44, 0.49), (0.38, 0.53). Some embodiments further comprise at least a first power line. Also provided are methods that comprise illuminating at least one light source to emit light within one of the areas defined above, and illuminating at least one 600-630 nm emitter.

A light emitting device includes at least three light emitting source and a phosphor, with the three light sources consisted of following light emitting diodes (LED) emitting lights having different wavelengths. Wherein, two light sources are used to excite the phosphor to produce a distinct wavelength different from those of the two light sources. The distinct wavelength is blended with portions of the two light sources and a light source from another independent light source, and a blended light is released to obtain a white light having an excellent color rendering index.

The present invention relates to a light-emitting device including a light source, a first light-emitting material spaced apart from the light source, and at least one additional light-emitting material. The first light-emitting material includes low reabsorbing semiconductor nanocrystals having an emission-center core, an exterior protective shell, and at least one inner light-absorbing shell. The device is useful for efficiently producing white light having a high color rendering index.

A system and method for generating white light involves using a combination of phosphor-converted white LEDs and non-phosphor-converted color LEDs to produce white light and adjusting the emitted light in response to feedback signals. Generating white light using a combination of phosphor-converted white LEDs and non-phosphor-converted color LEDs produces white light with an improved CRI and a wide SPD. Adjusting the emitted light in response to feedback allows luminance and chrominance characteristics of the white light to be controlled as the performance of the LEDs changes over time. The emitted light can be adjusted on a per-color basis and / or on a per-group basis, where a group of LEDs includes a combination of at least one phosphor-converted white LED and at least one non-phosphor-converted color LED.

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.

A lamp uses a solid state source to pump one or more doped semiconductor nanophosphors to produce a light output of a desired characteristic. The nanophosphor(s) is dispersed in a material, examples of which include liquids and gases. Various nanophosphors are discussed. In the examples, the material with the doped semiconductor nanophosphor(s) dispersed therein appears at least substantially clear when the lamp is off. The exemplary lamp also includes circuitry for driving the solid state source and a housing that at least encloses the drive circuitry. The lamp has a lighting industry standard lamp base mechanically connected to the housing and electrically connected to provide electricity to the circuitry for driving the solid state source.

The present invention relates to efficient organic light emitting devices (OLEDs). More specifically, the present invention relates to white-emitting OLEDs, or WOLEDs. The devices of the present invention employ three emissive sub-elements, typically emitting red, green and blue, to sufficiently cover the visible spectrum. The sub-elements are separated by charge generating layers.

The present invention discloses a high CRI white LED and a lamp comprising the white LED. The white LED includes a base, a reflector for mixing light, protrusions on the inner wall surface of the reflector, at least 6 LED chips emitting lights at different wavelengths, which are fixed and electrically combined on the heat conducting base, and a lead frame which has a shape and a size matched well with the bottom of the reflector and which is fixed outside the reflector and on the top surface of the base. Electrodes of the LED chips are electrically connected with leads on the lead frame. A transparent optical material covers the chips. The multi-wavelengths lights are mixed uniformly by diffuse reflection of the reflecting walls of the reflector to achieve a white LED with high CRI and high efficiency. A white LED lamp or a white LED plane light source comprising the white LED can avoid energy loss in optical conversion in which phosphors are used. With the configuration, the efficiency in electro-to-optic conversion and working lifetime of the lamps are improved. The lamp is also suitable for mass production.

An illumination and grow light system and associated methods are provided to produce an emission spectrum which may be optimized for plant response curve, as well as provide high quality light with respect to the human response curve. Embodiments of the present invention may include highly efficient tunable lamps and associated modulation controls that allow specific radiation wavelength bands to be manipulated, the emission direction and intensity to be varied, and the output power to be coordinated to create high fluxes of photosynthetic active radiation while maintaining a desirable color temperature and high color rendering index.

A lighting system with selectable emission characteristics may include a housing, a controller, a first plurality of light sources operatively coupled to the controller and carried by the housing, and a second plurality of light sources operatively coupled to and controlled by the controller and carried by the housing. The first and second pluralities of light sources may be operable to emit first and second combined lights, respectively, and to emit a first light having a wavelength within the range of 650 nanometers to 700 nanometers, a second light having a wavelength within the range of 500 nanometers to 570 nanometers, and a third light having a wavelength within the range of 430 nanometers to 470 nanometer. The second light may be characterized by a human photopic response of greater than 0.0 and less than 0.4 throughout the range from 500 nanometers to 570 nanometers.

An LED light emitter includes a single emitter structure having a substrate with a plurality of light emitting diodes (LEDs) arranged thereon, wherein the plurality of LEDs includes at least one first LED die that produces a first color light, and at least one second LED die that produces a second color light. The LED light emitter also includes a total internal reflection (TIR) lens positioned to collect light emitted from the single emitter structure and adapted to mix the light from the plurality of LEDs to produce a uniform light. The plurality of LEDs are selected such that the light output by the LED light emitter has a desired color temperature when an equal current is supplied to all of the plurality of LEDs.

The invention discloses a method for manufacturing a color temperature tunable LED lamp and the LED lamp. The method comprises the following steps: distributing a circuit board and fixed welding positions of LED chips on a substrate according to the luminance distribution conditions and manufacturing requirements of a plurality of LED chips; selecting a material for contact positions of the substrate and the LED chips according to material types of base layers of the LED chips, and carrying out adhesive dispensing and fixed welding on the substrate; blending different proportions of fluorescent powder according to the color temperature requirement of the LED lamp, and mixing and stirring the fluorescent powder and silica gel according to the required proportion; dispensing the mixed fluorescent powder gel on the surfaces of the LED chips; and baking the LED chips, coating with protective adhesive, and completing the encapsulation process of the plurality of LED chips. The manufacturing method has advanced process and easily controlled flow. The color temperature tunable LED lamp has good color rendering index and high luminous efficiency, and the color rendering index and the luminous efficiency cannot be reduced because of the change of the color temperature.

The invention provides a three-channel lighting apparatus with the option to support the human circadian rhythm. By choosing especially the blue LED and green phosphor, the range of biological activity that can be changed is optimized. By adjustment of the LED spectra a bigger range in melanopsin effectiveness factor, at the same CCT range (from daylight like CCT down to dimmed halogen), can be obtained.

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.

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.

A lamp that allows a user to adjust parameters to control emitted white light, specifically quality, intensity and color temperature. Under such control, the lamp can match, complement, or augment ambient or available natural or artificial light. In specific embodiments, the lamp uses high power, high CRI, white LED sources; integral thermal management that also functions as LED structural support; integral optics (secondary lenses) with accommodation for diffusing elements; and manually responsive controls.

A lamp that allows a user to adjust parameters to control emitted white light, specifically quality, intensity and color temperature. Under such control, the lamp can match, complement, or augment ambient or available natural or artificial light. In specific embodiments, the lamp uses high power, high CRI, white LED sources; integral thermal management that also functions as LED structural support; integral optics (secondary lenses) with accommodation for diffusing elements; and manually responsive controls.

The present invention relates to a system, method and tool for optimizing combination of Light Emitting Diodes (LEDs), and to an optimized combination of LEDs. The system and method provide a plurality of LEDs and corresponding specifications. Then, a color temperature and a color rendering index are selected. Calculations are performed for subgroups of LEDs. At least one optimized combination of LEDs having an optimized corresponding luminous flux is identified according to selected color temperature, color rendering index and LEDs' specifications. In another aspect, the present invention relates to a tool for optimizing white light generated by a combination of LEDs. The tool comprises a repository for storing specifications for the combination of LEDs, a selection module for selecting at least one of the following parameters: a color temperature, a color rendering index and a maximum shift variance from a black body locus, and a processing module for calculating for subgroups of LEDs resulting color temperature, color rendering index, luminous flux, and for identifying an optimized selection of LEDs. The present invention also relates to an optimized combination of LEDs for producing white light with high color rendering index, the combination of LEDs excluding blue LEDs.

The invention relates to an optical conversion luminous film and a preparation method thereof. The optical conversion luminous film is formed by a diffusion film and a mixed paint layer on the diffusion film; the optical conversion luminous film has the thickness of 30-200mum, wherein, the thickness of the diffusion film is 20-70mum; the mixed paint layer is made of 10.000-30.000% of yellow luminous fluorescent material, 0.001-2.000% of red luminous fluorescent material, 60.000-89.000% of polymer resin, 1.000-5.000% of bi-amino silane, 0.000-20.000% of diluting agent and 0.000-5.000% of accessory ingredient. By combining the yellow luminous fluorescent material and the red luminous fluorescent material, the invention can realize the aim of regulating chromaticity coordinate, color temperature and color rendering index, thus preparing the optical conversion luminous film which is made of the fluorescent materials and has the advantages of high color rendering index of the photodiffusion effect, good property of uniform light, anti-dazzle, high light conversion efficiency, low cost, excellent aging characteristic and simple production technique.

A white-light emitting device includes a first die and a second die. The first die has a first semiconductor light-emitting layer emitting a first primary color light. The second die has a second semiconductor light-emitting layer emitting a second primary color light, and a third semiconductor light-emitting layer mounted proximate to the second semiconductor light-emitting layer and emitting a third primary color light. The first primary color light is combined with the second and third primary color lights so as to produce white light.

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.

The invention discloses a method for preparing mononuclear AgInS2 quantum dots, comprising the following steps of: (1) adding AgNO3, InCl3, oleic acid, dodecyl mercaptan and solvent octadecene in a reaction container, to obtain an Ag and In precursor mixed liquor; (2) adding sulfur powder into oleylamine, and heating until the sulfur powder is fully dissolved, to obtain an S precursor solution; (3) under protection of argon, heating the Ag and In precursor mixed liquor from room temperature to 50-80 DEG C, and maintaining for 10-60min, in order to discharging air; and then raising temperature to 100-120 DEG C, maintaining for 1-5min, and injecting the S solution, wherein a mol ratio of Ag to S is 1:2, and reaction time is 5-90min; (4) sampling, and dissolving a sample into hexane, to obtain a AgInS2 quantum dot solution; and (5) adding waterless ethanol into the AgInS2 quantum dot solution obtained in the step (4), and centrifugally separating to obtain the mononuclear AgInS2 quantum dots. The method of the invention further raises fluorescent quantum yield of the mononuclear AgInS2 quantum dots prepared by a thermal injection method, in order to reach practical application requirement.

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.

The invention discloses a four-color LED light mixing method based on visible light communication. The method comprises the steps that spectral power distribution of all monochromatic light is obtained through a spectrograph, and the tristimulus value of each corresponding monochromatic light is calculated; the target color temperature of mixed light is determined, and a corresponding reference light source is selected and used for obtaining the tristimulus value of a mixed color; according to the color addition principle, the sum of the tristimulus values of all the monochromatic light should be equal to the tristimulus value of the mixed color, and a color mixing equation set is obtained; the spectral power distribution of the mixed light can be obtained according to the light mixing coefficient of all the monochromatic light in the color mixing equation set, and the color rendering index Ra of the mixed light is calculated according to the spectral power distribution of the mixed light, wherein Ra is larger than or equal to epsilon; the range of the channel capacity C of the mixed light is calculated, and the maximum capacity Cmax is solved within the range; the ratio of all the colored light with the maximum capacity is output.

The invention discloses a light-emitting device and a projecting system. The light-emitting device comprises a first wavelength converting material layer which is used for absorbing laser light and emitting mixed stimulated light, wherein the first wavelength converting material layer comprises a first face and a second face which are opposite; the first face is used for receiving exciting light; the light-emitting device additionally comprises a first wavelength converting material which is used for absorbing the exciting light and producing first stimulated light, and a second wavelength converting material which is used for receiving at least part of the first stimulated light and producing second stimulated light; the energy transformation efficiency of the first wavelength converting material is higher than that of the second wavelength converting material; and the light-emitting device also comprises an optical film which is positioned on one side of the second face close to the first wavelength converting material layer and is used for reflecting the first stimulated light and the second stimulated light from the first wavelength converting material layer. Compared with a light-emitting device separately using the first or the second wavelength converting material, the light-emitting device disclosed by the invention can obtain higher luminous flux of monochromatic light.

In order to improve the color rendition of solid-state illumination devices, an illumination system comprising a radiation source capable of emitting primary radiation and a luminescent material comprising a blend of a first phosphor capable of converting the primary radiation into a broad-band emission in the yellow range of the electromagnetic spectrum and a second phosphor capable of converting the primary radiation into a multiple narrow-band emission in the red and green range of the electromagnetic spectrum is provided.

The diode is comprised of the luminous chip electrode, phosphor and sealing material. The phosphor is comprised of the silicon chloride acid Mg Zn Ca (CMZSC) and alkali earth silicate and pyrosilicate phosphor. This phosphor with the other phosphor of the visible light combines the UV white light and LD. The CMZSC green phosphor can transform the blue light transmitted by the semiconductor compound into yellow light. Thus the transmitting spectrum covered area is broadened and the optical transform effect is improved.