650 results about "Ultraviolet light emitting diodes" patented technology

Methods and apparatus in which ultraviolet radiation is generated from at least one first LED, an object is irradiated with the ultraviolet radiation, and the ultraviolet radiation is controlled so as to generate at least one perceivable visual effect based on an interaction between the ultraviolet radiation and the object.

A photon energy conversion device uses at least one ultraviolet light emitting diode (UV-LED) with a wavelength shifting medium such as phosphor or quantum dots. The device can be used as a light source, and shaped like incandescent light bulbs, fluorescent tubes, circles or compact fluorescent bulbs.

A method of growing an AlGaN semiconductor material utilizes an excess of Ga above the stoichiometric amount typically used. The excess Ga results in the formation of band structure potential fluctuations that improve the efficiency of radiative recombination and increase light generation of optoelectronic devices, in particular ultraviolet light emitting diodes, made using the method. Several improvements in UV LED design and performance are also provided for use together with the excess Ga growth method. Devices made with the method can be used for water purification, surface sterilization, communications, and data storage and retrieval.

An apparatus and process for curing UV-curable inks is provided comprising multiple printhead ejectors and ultraviolet light emitting diodes (UV-LEDs). The printhead ejectors are placed on the assembly in a geometry corresponding to the UV-LEDs such that when a printhead ejector deposits an ink droplet upon a substrate moving relative to the assembly, at least one UV-LED can pass directly over the ink droplet.

A method for the fabrication of nonpolar indium gallium nitride (InGaN) films as well as nonpolar InGaN-containing device structures using metalorganic chemical vapor deposition (MOVCD). The method is used to fabricate nonpolar InGaN / GaN violet and near-ultraviolet light emitting diodes and laser diodes.

An ink jet recording apparatus in which a UV curable ink is ejected from nozzle holes of an ink jet head. The ejected ink is attached onto a recording surface of a recording medium (recording paper), and is cured by irradiation with ultraviolet light. The ink jet head, or a moving member which moves together with the ink jet head, is provided with a plurality of ultraviolet light emitting diodes that emit the ultraviolet light to the ink attached onto the recording surface of the recording medium to cure the ink.

A polarized white light emitting diode is provided, including a substrate with an ultraviolet light emitting diode (UV LED) chip disposed thereover for emitting ultraviolet (UV) light, a phosphor layer coated around the UV LED chip to be excited by the UV light from the UV LED chip to thereby emit white light, an omni-directional reflector disposed over the phosphor layer, a medium layer disposed between the omni-directional reflector and the phosphor layer, wherein the omni-directional reflector allows the UV light from the UV LED chip to be multiply and omni-directionally reflected in between the phosphor layer and the medium layer, a transparent substrate disposed over the omni-directional reflector, and a metal-containing polarization layer disposed over the transparent substrate for polarizing the white light emitted from the phosphor layer to thereby emit a polarized white light

A breathing apparatus according to embodiments of the invention includes a facemask portion sized to cover a lower portion of a wearer's face. The facemask portion includes a flow chamber. The flow chamber includes a first opening disposed near a first end of the flow chamber, a second opening disposed near a second end of the flow chamber, and a serpentine passage disposed between the first opening and the second opening. At least one light emitting diode configured to emit light having a peak wavelength in the ultraviolet range is disposed in the serpentine passage. The at least one light emitting diode is disposed off center relative to a centerline oriented along a direction of air flow through the serpentine passage.

An exposure apparatus for use in optical lithography can include a holder and a plurality of UV-LED modules carried by the holder and disposed in an array. A respective plurality of collimating lenses can be disposed in an array corresponding to the array of UV-LED modules. The plurality of UV-LED modules and the respective plurality of collimating lenses can provide a respective plurality of distinct beams of UV light. The plurality of collimating lenses may be spaced from the plurality of UV-LED modules and spaced from the exposure plane and have an optical configuration providing a composite beam of UV light formed from the plurality of distinct beams of UV light in which each beam inside the periphery of the array overlaps each adjacent beam by at least 70% at the exposure plane. A method for directing light onto an exposure plane in an optical lithography procedure is provided.

Embodiments of a sterilization apparatus and methods of using a sterilization system are disclosed in the present application. The sterilization apparatus can take the form of a sterilization chamber comprising a top wall, a bottom wall, end walls and side walls which define the interior of the chamber. Throughout the interior of the chamber, multiple ultraviolet light emitting diodes (UVLEDs) irradiate energy at wavelengths for destroying pathogenic substances and achieving an efficient level of sterilization. A UV transparent plate located within the interior of the chamber can support one or more target devices, and can be proportionally sized to accommodate placement of a target device for the simultaneous and uniform distribution of UV sterilizing energy to the surfaces of a target. The sterilization chamber can provide the necessary decontamination and sterilization measures to effectively eliminate any residual biological contaminants on the exposed or hard-to-reach crevices or features of a medical device. Furthermore, one or more interior surfaces of the chamber may comprise a UV reflective material for distributing UV radiation upon substantially all surfaces of a target.

A mouthpiece of the present invention includes a light irradiation section that irradiates the front surfaces of teeth with light having a predetermined wavelength, and the light irradiation section has a blue light emitting diode or ultraviolet light emitting diode. The mouthpiece is attached to the teeth and the front teeth are irradiated with a blue light or ultraviolet light emitted by the light emitting diode, thereby performing teeth whitening processing.

A method and apparatus for producing bulk single crystals of AlN having low dislocation densities of about 10,000 cm−2 or less includes a crystal growth enclosure with Al and N2 source material therein, capable of forming bulk crystals. The apparatus maintains the N2 partial pressure at greater than stoichiometric pressure relative to the Al within the crystal growth enclosure, while maintaining the total vapor pressure in the crystal growth enclosure at super-atmospheric pressure. At least one nucleation site is provided in the crystal growth enclosure, and provision is made for cooling the nucleation site relative to other locations in the crystal growth enclosure. The Al and N2 vapor is then deposited to grow single crystalline low dislocation density AlN at the nucleation site. High efficiency ultraviolet light emitting diodes and ultraviolet laser diodes are fabricated on low defect density AlN substrates, which are cut from the low dislocation density AlN crystals. Bulk crystals of ZnO may also be produced using the method.

The invention relates to an omnidirectional antibacterial intelligent type air purifier for a vehicle, which comprises a shell, an air purification component, a fan power component, an energy component, an induction sensor component, a negative-ion generator and a display intelligent control component. The omnidirectional antibacterial intelligent type air purifier for the vehicle uses a nano silver modified titanium dioxide as a photocatalyst, thereby increasing photocatalysis effect and sterilization antibacterial performance. The omnidirectional antibacterial intelligent type air purifier for the vehicle uses an ultraviolet light emitting diode as a ultraviolet light source, thereby guaranteeing the photocatalyst to be capable of playing the role of degrading pollutants efficiently. The inner surface and the outer surface of an enclosure all have antibacterial performance, thereby guaranteeing bacteria not to live on the surface of an airframe of the omnidirectional antibacterial intelligent type air purifier for the vehicle, and guaranteeing personal safety. The omnidirectional antibacterial intelligent type air purifier for the vehicle can automatically induct air conditions, adjusts purification power in real time, and has intelligent control function.

A water purification system utilizing a plurality of ultraviolet light emitting diodes and associated method of use is disclosed. This includes an inlet, an ultraviolet radiation chamber, and an outlet, wherein the inlet is connected in fluid relationship to the ultraviolet radiation chamber and the outlet is connected in fluid relationship to the ultraviolet radiation chamber to allow water to flow between the inlet and the outlet through the ultraviolet radiation chamber, wherein the ultraviolet radiation chamber is positioned adjacent to a plurality of ultraviolet light emitting diodes. The plurality of ultraviolet light emitting diodes may be mounted on a flexible electrical circuit board and / or in the form of an array. Moreover, the ultraviolet radiation chamber can be a transparent tube with the plurality of ultraviolet light emitting diodes positioned on the outside of the transparent tube or positioned within the transparent jacket.

A Ce3+ based aluminate phosphor or Ce3+ based phosphor in a solid solution can be used for white light generation when combined with a blue or ultraviolet light emitting diode.

The invention discloses a BootLoader based remote upgrade method for a UV LED (Ultraviolet Light Emitting Diode) curing system. The system manages and distributes FLASH storage addresses of a user program area, an upgrade storage area and a parameter storage area; a request of an upper computer is received for judging whether to perform upgrade or not; the request of the upper computer is received for performing information transmission of a program version number, a verification code and the like; and the jumping of a user program is finished after the completion of upgrade. According to the method, BootLoader is combined with IAP and a remote upgrade system finished through communication of the upper computer or configuration of communication modules of GPRS, WiFi, an Ethernet card and the like is integrated in a UV LED control device, so that remote debugging and program updating of the device can be finished, the maintenance cost is greatly reduced, and the maintenance cycle is greatly shortened.

A UV LED device may be used for curing fluids. In one embodiment, LEDs are positioned on faces defined by an inverted recess in a base portion. The LEDs are configured such that the light beams emitted from the LEDs converge at a single area or point to provide a single, focused area or point of amplified power from the LEDs. In another embodiment, the base portion is elongated to provide a single, focused line or region of amplified power from the LEDs. In another embodiment, the curing process occurs in an inert atmosphere. In one embodiment, a printed circuit is disposed in the base portion to provide power to the LEDs.

A support has an interior section positionable on one side of a wearer's head. The support has an exterior section positionable over the wearer's face. The exterior section has a free end with a recess. A plurality of light emitters is located in the recess and adapted to function within the germicidal spectrum for air. An electrical assembly is coupled to the light emitters. A shield of light is formed adjacent to the wearer's nose and mouth. When the wearer breathes air, the breathed air becomes sanitized by the passage of pathogens through a curtain of light immediately prior to being breathed.

The invention relates to ultraviolet curing equipment and method for an optical fiber coating. The equipment comprises a cylindrical mounting base, wherein an inner cavity of the cylindrical mounting base is provided with UVLED (Ultraviolet Light Emitting Diode) light source modules in a peripheral direction and an axial direction; a cylindrical focusing lens is arranged in front of light-emitting surfaces of the UVLED light source modules, so that ultraviolet rays emitted from the UVLED light source modules are focused on a same curing axis. The ultraviolet curing equipment disclosed by the invention is long in service life, small in heating amount and low in energy consumption; a layout space of light sources is large, so that the output of the UV light sources of a plurality of UVLED light source modules are focused on the curing axis to form a UV light column with high light intensity; an optical fiber absorbs UV and is cured when passing through the UV light column; the light strength of the light column is high and the light sources are from multiple directions, so that the equipment has higher curing efficiency and better curing uniformity, the curing time is shortened, the work efficiency of wiredrawing of the optical fiber is improved, and the curing quality of the coating is improved.

A light emitting device with a template comprising a substrate and a nested superlattice. The superlattice has Al1-x-yInyGaxN wherein 0≦x≦α and 0≦y≦1 with x increasing with distance from said substrate. An ultraviolet light-emitting structure on the template has a first layer with a first conductivity comprising Al1-x-yInyGaxN wherein α≦x; a light emitting quantum well region above the first layer comprising Al1-x-yInyGaxN wherein α≦x≦b; and a second layer over the light emitting quantum well with a second conductivity comprising Al1-x-yInyGaxN wherein b≦x. The light emitting device also has a first electrical contact in electrical connection with the first layer, a second electrical contact in electrical connection with the second layer; and the device emits ultraviolet light.

An ultra-violet light-emitting diode (LED) array, 12, and method for fabricating same with an AlInGaN multiple-quantum-well active region, 500, exhibiting stable cw-powers. The LED includes a template, 10, with an ultraviolet light-emitting array structure on it. The template includes a first buffer layer, 321, then a second buffer layer, 421, on the first preferably with a strain-relieving layer in both buffer layers. Next there is a semiconductor layer having a first type of conductivity, 500, followed by a layer providing a quantum-well region, 600, with an emission spectrum ranging from 190 nm to 369 nm. Another semiconductor layer having a second type of conductivity is applied next, 800. A first metal contact, 980, is a charge spreading layer in electrical contact with the first layer and between the array of LED's. A second contact, 990, is applied to the semiconductor layer having the second type of conductivity, to complete the LED.

The invention discloses a rapid curing coating applicable to a UV-LED (Ultraviolet-Light-Emitting Diode) light source. The coating comprises the following components in percentage by weight: 4-10 percent of a photoinitiator, 20-60 percent of a special oligopolymer, 10-50 percent of an active diluent, 6-12 percent of a promoter, 0.1-2 percent of an aid and 0-30 percent of a pigment. The rapid curing coating applicable to the UV-LED light source can be prepared by slowly stirring and mixing the components uniformly in sequence under the condition that sunlight or ultraviolet light irradiation is avoided and the relative air humidity is less than 70 percent, and keeping the temperature of a mixture below 50 DEG C in a stirring process. The rapid curing coating can be cured rapidly under low UV light intensity and energy, and has the characteristics of high luster, high adhesion and high wear resistance; the production efficiency of UV-LED photo-curing is increased to a great degree; and a highly-environmentally-friendly and highly-energy-saving UV-LED photo-curing technology is applied widely.

A substrate comprising a trench lateral epitaxial overgrowth structure including a trench cavity, wherein the trench cavity includes a growth-blocking layer or patterned material supportive of a coalescent Pendeo layer thereon, on at least a portion of an inside surface of the trench. Such substrate is suitable for carrying out lateral epitaxial overgrowth to form a bridged lateral overgrowth formation overlying the trench cavity. The bridged lateral overgrowth formation provides a substrate surface on which epitaxial layers can be grown in the fabrication of microelectronic devices such as laser diodes, high electron mobility transistors, ultraviolet light emitting diodes, and other devices in which low dislocation density is critical. The epitaxial substrate structures of the invention can be formed without the necessity for deep trenches, such as are required in conventional Pendeo epitaxial overgrowth structures.

An apparatus and process for curing UV-curable inks having multiple printhead ejectors and ultraviolet light emitting diodes (UV-LEDs). The printhead ejectors are placed on the assembly in a geometry corresponding to the UV-LEDs such that when a printhead ejector deposits an ink droplet upon a substrate moving relative to the assembly, at least one UV-LED can pass directly over the ink droplet.

A light emitting diode is provided, which includes an n-type contact layer and a light generating structure adjacent to the n-type contact layer. The light generating structure includes a set of quantum wells. The contact layer and light generating structure can be configured so that a difference between an energy of the n-type contact layer and an electron ground state energy of a quantum well is greater than an energy of a polar optical phonon in a material of the light generating structure. Additionally, the light generating structure can be configured so that its width is comparable to a mean free path for emission of a polar optical phonon by an electron injected into the light generating structure. The diode can include a blocking layer, which is configured so that a difference between an energy of the blocking layer and the electron ground state energy of a quantum well is greater than the energy of the polar optical phonon in the material of the light generating structure. The diode can include a composite contact, including an adhesion layer, which is at least partially transparent to light generated by the light generating structure and a reflecting metal layer configured to reflect at least a portion of the light generated by the light generating structure.

The invention discloses a method for achieving oil painting three-dimensional duplication through an ultraviolet-light-emitting diode (UV-LED) ink-jet printer. The method comprises the following steps that (1) colored image information of an oil painting is obtained through two-dimensional non-contact scanning equipment; (2) pigment height information of the oil painting is obtained through three-dimensional scanning equipment, and a surface configuration three-dimensional model of the oil painting is established; (3) the number of layers of printing is determined according to the Z-axis height of the model, and the number of the layers is obtained by dividing the maximum value of the Z-axis by the average thickness of a single layer of white ultraviolet (UV) printing ink; (4) the cross section of each layer is extracted, and the cross sections of the layers are introduced into the UV printer to be printed after being subjected to vectorization treatment; (5) stacking printing is conducted through the white UV printing ink according to layer data, and a white three-dimensional oil painting entity is obtained; and (6) colored images are printed on the white three-dimensional oil painting entity, and a three-dimensional oil painting duplicate is formed. By means of the method, the concave-convex undulating characteristics of pigment on the surface of an oil painting original manuscript can be reproduced veritably, the three-dimensional impression of a real oil painting is achieved, the deficiency that the three-dimensional duplication of the oil painting cannot be achieved through an ordinary paint spraying and printing method is remedied, and the requirements for high-fidelity oil painting duplication can be met.

A method, system, and device for sterilizing a medium such as gas or liquid, by arranging light sources in relation to a container containing the medium, and by then generating ultraviolet (UV) radiation for destroying bacteria or other microorganisms in the medium. The microorganisms are preferably destroyed by interacting with the UV radiation, thus damaging the DNA of the organisms and their ability to reproduce. The light sources, such as light emitting diodes, may be powered with a low voltage source as a primary power supply. The system or device include means, such as a sleeve, for situating the LEDs with respect to the container.