106 results about "Thermal quenching" patented technology

A light conversion device and high-intensity, solid-state light source utilize wavelength conversion elements with a thermal conductivity greater than 1 watt per meter per degree Kelvin (W/m-K). Exemplary materials that have high thermal conductivity include monocrystalline solids, polycrystalline solids, substantially densified ceramic solids, amorphous solids or composite solids. The light conversion device and high-intensity, solid-state light source have at least one heat sink that is in direct thermal contact with the wavelength conversion element. The heat sink quickly dissipates heat generated within the wavelength conversion element in order to prevent the wavelength conversion element from overheating and undergoing thermal quenching of the wavelength conversion and light emission.

A method for manufacturing a liquid crystal display device includes preparing a lower substrate and an upper substrate; depositing a sealant on one of the two substrates; dropping a liquid crystal on one of the two substrates; bonding the two substrates to each other; bonding the two substrates to each other by hardening the sealant; and thermal quenching the two bonded substrates. Since thermal quenching of the two bonded substrates is additionally performed after hardening of the sealant is performed using a liquid crystal dropping method, orientation of a liquid crystal layer, which is scattered by the hardening of the sealant, is returned to its original state, thus preventing domain defects.

Ferritic nitrocarburized surface treatment of cast iron brake rotors providing oxidation resistance, good braking performance and absence of distortion. Machined brake rotors are pre-heated, then immersed into a high temperature molten nitrocarburizing salt bath for a first predetermined dwell time. After removing the brake rotors from the nitrocarburizing salt bath, the brake rotors are directly immersed into an oxidizing salt bath at a lower temperature than the nitrocarburizing salt bath so that the brake rotors are thermally quenched. After a predetermined second dwell time in the oxidizing salt bath, the brake rotors are removed therefrom and further cooled to room temperature, either by water application thermal quenching or slow cooling in air. A fixture provides stable holding the brake rotors with a minimum of contact during placement in the salt baths.

The invention discloses a gold-wire-free LED device. The LED chip is flipped on a substrate, and the P pole and N pole of the LED chip are led to the second metal electrode layer on the lower surface of the substrate through a through hole on the substrate. A heat dissipation metal pad is provided on the lower surface to realize the purpose of separating thermoelectric channels of the LED device, and greatly enhance the heat dissipation performance and reliability of the LED device. At the same time, the present invention also has a multi-layer packaging structure, the light conversion material layer can be far away from the LED chip, effectively prevents the thermal quenching effect of the light conversion material, and greatly improves the uniformity of light color of the LED device.

This disclosure relates to the synthesis of Er doped GaN epilayers by in-situ doping by metal-organic chemical vapor deposition (MOCVD). In an embodiment, both above and below bandgap excitation results in a sharp PL emission peak at 1.54 μm. Contrary with other growth methods, MOCVD grown Er-doped GaN epilayers exhibit virtually no visible emission lines, an present a small thermal quenching effect. The Er incorporation has very little effect on the electrical conductivity of the GaN epilayers and Er doped layers retain similar electrical properties as those of undoped GaN.

A method of applying at least two phosphors to an LED, wherein a first phosphor material having a lower absorption, shorter luminescence decay time, and/or lower thermal quenching than a second phosphor material is positioned closer to the LED than the second phosphor. Such an arrangement provides a light emitting device with improved lumen output and color stability over a range of drive currents.

A thermal quenching installation making use of induction heating. This installation has induction heater means comprising a stationary induction coil, handling means to cause the element to pass through said coil, and cooling means, preferably a shower, disposed downstream from the coil.

The invention provides an optical temperature measuring material with color-change fluorescence. The structural general formula of the optical temperature measuring material is Ca<3-m-n>Sr<m>ZnLi(VO<4>)<3>:Eu<n><3+>, wherein Eu<n><3+> is an activated ion. The material is prepared by adopting a high-temperature solid-phase method. According to the material, under effective excitation of ultravioletlight, [VO4]<3-> groups of a matrix and activated ion Eu<n><3+> are used as double light-emitting centers to simultaneously give out respective characteristic spectrums. Due to the fact that the thermal quenching properties of the two light emitting centers are different, the change, along with the temperature change, of color coordinates (x,y) corresponding to light emitting colors of the material meets a linear equation trajectory, so that a temperature can be roughly determined and calibrated by utilizing fluorescence color change under excitation of ultraviolet light. Meanwhile, the two characteristic spectrums are monitored, and the temperature is precisely determined and calibrated by utilizing the fluorescence intensity ratio of the double light-emitting centers. Compared with theprior art, the method can be used to roughly calibrate the temperature by utilizing fluorescence color change, and can be used to precisely calibrate the temperature by utilizing the fluorescence intensity ratio of the double light-emitting centers, the temperature measuring range is wide, and the signal detection and discrimination degree is large. The invention further provides a preparation method and application of the optical temperature measuring material with color-change fluorescence.

The invention discloses a plant growth lamp which comprises a lamp holder. The lamp holder is provided with a bowl-shaped lampshade. A light source capable of emitting blue light with the length ranging from 380 nm to 480 nm is arranged at the bowl bottom position of the lampshade. A transparent lampshade piece capable of covering a bowl opening is arranged on the bowl opening of the lampshade. The transparent lamp piece and the light source are arranged in a spaced mode. Red fluorescent powder capable of emitting out red light with the length ranging from 600 nm to 700 nm by being motivated by the blue light with the length ranging from 380 nm to 480 nm is arranged on the transparent lampshade piece. The transparent lampshade piece is detachably connected to the lampshade. According to the plant growth lamp, a user can adjust the optical performance of the plant growth lamp according to the different growth stages of plant, thermal quenching influences of the fluorescent powder are avoided, and the selectivity range of the fluorescent powder is enlarged.

The invention discloses a method for preparing nitride red fluorescent powder for a white light LED, which comprises the following steps: sufficiently mixing 1.98 to 1.999 mol of compound A, 0.001 to 0.02 mol of EuN0.95 and 1.67 mol of amorphous Si3N4 to obtain a mixture; burning the mixture at a temperature of 1,350 DEG C for 15 hours and then cooling the mixture to room temperature for the first time grinding; reburning the product of the first time grinding at a temperature of 1,450 DEG C for 13 hours, and cooling the product to the room temperature; and taking the product out for the second time grinding, and screening the product through a 150-mesh screen cloth after the second time grinding to obtain the nitride red fluorescent powder for the white light LED. The compound A is SrNx, BaNx or Ca3N2. The chemical and thermal stabilities of the nitride fluorescent powder is good, the absorption from an ultraviolet light zone to a blue light zone is strong, the thermal quenching temperature is high, and the nitride fluorescent powder can absorb light in a range of between 250 and 600 nanometers and emit red light of which the peak value is between 590 and 660 nanometers.

The invention discloses a manufacturing method for a die-casting machine injection punch and relates to parts for pressure casting. The manufacturing method is used for manufacturing the wear-resistant die-casting machine injection punch containing carbide isothermal quenching nodular cast iron. The manufacturing method comprises the steps that raw materials with the required quantity are weighed, wherein the raw materials comprise pig iron, steel scraps, ferrosilicon, ferromanganese, ferrochromium, ferromolybdenum and ferrovanadium; the raw materials are subjected to smelting, nodulization with rare earth ferrosiliconmagnesium nodulizing agents, inoculation with silicon-barium alloy inoculating agents, molding by casting and thermal quenching treatment to obtain the finished die-casting machine injection punch containing the components, by mass, 3.5-3.8% of C, 2.6-2.8% of Si, 0.8-1.2% of Mn, 0.7-1.2% of Cr, 0.2-0.4% of Mo, 0.1-0.3% of V, 0.03-0.06% of P, 0.01-0.02% of S, 0.03-0.05% of Mg, 0.01-0.02% of Ce and the rest Fe. The die-casting machine injection punch is good in overall performance, long in service life and high in performance cost ratio.

The invention provides a vanadate luminescent material. The chemical general formula of the vanadate luminescent material is A3Ln1-x(VO4)3:xEu<3+>, wherein Eu<3+> is activated ion, A3Ln1-x(VO4)3 is matrix, the A is Ca, Ba or Sr, Ln is La, Y or Lu, x is the mole percentage of substitution of Lu atom by Eu atom, and x is greater than 0 and less than or equal to 0.06. The vanadate luminescent material provided by the invention can emit high intensity red light with good color purity. Also the material has luminescent intensity strengthened along with the rise of the environmental temperature, thermal quenching phenomenon is unlikely to occur, and the luminous efficiency is high, and the vanadate luminescent material can be used for white light LED and other luminescent fields. In addition, the invention also provides a preparation method of the vanadate luminescent material.

The invention provides a laser projector which comprises a laser light source, a diffusion plate, a polarizing beam splitter, a quarter-wave plate and a fluorescent pink wheel. The laser light source is used for generating a laser beam which travels along a first optical path. The diffusion plate is arranged on the first optical path to diffuse the laser beam to generate a diffusion beam, and the half-peak half width of the diffusion beam is larger than or equal to 1.5 degrees and is smaller than or equal to 3 degrees. The polarizing beam splitter is used for reflecting the diffusion beam to generate a reflection beam which travels along a second optical path. The quarter-wave plate is arranged on the second optical path and converts the reflection beam into a first circularly polarized beam. The fluorescent pink wheel receives the first circularly polarized beam to generate a second circularly polarized beam and a stimulated light beam with an optical path opposite to the second optical path. The quarter-wave plate also is used for converting the second circularly polarized beam into a P polarized beam, and the polarizing beam splitter allows the penetration of the P polarized beam and the stimulated light beam. By using the laser projector, the probability of a thermal quenching phenomenon of the fluorescent pink wheel is reduced.

The embodiment of the invention discloses a luminescence device and a related projection system and an illumination system; the luminescence device comprises the following units: a light source; a surface diffuser used for diffusing incident lights from the light source, wherein the incident light obliquely enters the diffuser, thus forming a diffusion light spot in a polarity shape through the diffuser; the normal of a surface diffuser diffusion surface is in a plane defined by the incident lights and a preset direction; the luminescence device also comprises a wavelength converter, wherein the light diffused by the surface diffuser enters the wavelength converter. The polarity shape of the system can fully utilize a rectangle inlet area of an integrator rod, i.e., the fluorescence lightspot entering the integrator rod can be bigger, so an excitation light spot entering phosphor can be bigger, thus reducing the excitation light energy density, and reducing thermal quenching phenomenon.

Provided are: a wavelength conversion member capable of efficiently dissipating heat from a site that tends to generate heat when irradiated with light having a high energy density, thereby minimizingthe thermal quenching of phosphor; a manufacturing method for the wavelength conversion member; and a light-emitting device. The reflective-type wavelength conversion member 100, which converts lighthaving a wavelength within a specific range to light of another wavelength while reflecting light from the reflection surface for use as illumination light, comprises: a transmissive material 110 comprising an inorganic material and transmitting light; a phosphor layer 120 bonded to the transmissive material 110 and comprising phosphor particles that emit converted light in response to the absorbed light and a translucent ceramic that couples the phosphor particles together; and a reflection material 130 disposed on the opposite side of the transmissive material 110 and in contact with the phosphor layer 120 with the surface serving as a reflection surface for the converted light. Thus, it is possible to efficiently dissipate heat from the site which tends to generate heat when irradiatedwith light having a high energy density, thereby minimizing the thermal quenching of the phosphor.

The invention discloses high-heat-stability white light light-emitting glass for a borate matrix LED, and a preparation method of the light-emitting glass. The chemical formula of the light-emitting glass is (100-4x-2y)SrO-200B2O3-xTb4O7-yEu2O3, wherein x is greater than or equal to 2 and smaller than or equal to 3, and y is greater than or equal to 2 and smaller than or equal to 5. The white light light-emitting glass provided by the invention is near ultraviolet excited white light luminescent borate glass, has the light-emitting character of fluorescent powder and also has the encapsulation performance of epoxy resin, so the fluorescent power and the epoxy resin encapsulation material for the traditional white light LED can be replaced and the preparation process of the traditional white light LED is simplified; furthermore, the white light light-emitting glass has the advantages of high transmittance, high heat stability and the like, can solve the problems that the epoxy resin for LED encapsulation is liable to ageing as well as the heat stability, the heat conductivity and the transmittance are reduced along with the increment of the use time, also can solve the problems that chroma excursion, light intensity thermal quenching and the like occur in the traditional LED fluorescent powder, and can be used for preparing white light LED devices with high heat stability and low cost through a simple process.

The invention discloses silicon-based nitrogen oxide fluorescent powder as well as a preparation method and application thereof. A general chemical formula of the fluorescent powder is Q.(Si<3>N<4>)<K>, wherein in the formula, k is more than 0.8 and less than 1.2. The fluorescent powder is synthesized through the following two steps: firstly synthesizing a precursor Q and then synthesizing the silicon-based nitrogen oxide fluorescent powder, wherein a general chemical formula of the precursor Q is M<x>(Si,A<2>)O<2+x>:yEu<2+>, zA<1><3+>; in the formula, M is at least one of Sr, Ba, Mg, Ca, Zn, Cu and Mn; A1 is at least one of Y, La, Sc and Er; A2 is not added or A2 is Ge; x is not less than 1.9 and not more than 2.1; y is not less than 0.005 and not more than 0.2; z is not less than 0.01 and not more than 0.2. The fluorescent powder provided by the invention can be effectively excited by 300nm-470nm wavelength to emit blue-green light or green-yellow light with peak wavelength of 490nm-560nm, has high quantum efficiency, narrow full width at half maximum (FWHM) and high thermal quenching temperature and can be matched with blue chips-ultraviolet chips to be applied to the field of white LED or display.

A LabVIEW-based multi-functional optical test system and method relates to optical performance test. The system comprises a test hardware part and a LabVIEW-based measurement and control system platform, wherein the test hardware part comprises a light source system, a temperature control system and a data acquisition system, the light source system is used for simulating a light-emitting sample,the temperature control system is used for controlling a temperature of the light-emitting sample, the data acquisition system is used for acquiring test data, the light source system, the temperaturecontrol system and the data acquisition system are all in coupling connection and/or communication connection with the measurement and control system, the light source system comprises a light sourceand a light source control module, and the light source is in communication connection with the measurement and control system platform by the light source control module. By the system, the measurement and control system platform having five test modes such as a long afterglow attenuation curve, a thermoluminescence curve, a time resolution phosphorescence spectrum, fluorescence thermal quenching and fluorescence thermal stability is achieved.

The invention provides down-conversion fluorescent powder Ba3EuAl2O7.5 with negative heat quenching behavior and a preparation method thereof, and belongs to the field of inorganic luminescent materials, the down-conversion fluorescent powder is prepared by a high-temperature solid phase method, and the preparation method specifically comprises the following steps: weighing raw materials according to the molar ratio of elements Ba, Eu and Al of 3: 1: 2, adding absolute ethyl alcohol, stirring, standing, drying, pressing to obtain a wafer, and sintering the wafer in a high-temperature muffle furnace at 1450-1550 DEG C for 250-420 minutes to obtain the down-conversion fluorescent powder Ba3EuAl2O7.5 with negative heat quenching behavior. The down-conversion fluorescent powder Ba3EuAl2O7.5 of a monoclinic system is obtained, the down-conversion fluorescent powder Ba3EuAl2O7.5 can emit strong orange red light under excitation of UV/NUV light, shows an obvious negative heat quenching behavior within 30-300 DEG C, namely, the luminous intensity is remarkably enhanced along with temperature rise, and has excellent thermal stability, a simple preparation process and a wide application prospect.