730 results about "White lead" patented technology

A white LED device includes a member, a plurality of LEDs, fixed on the member, the LEDS further comprising blue GaN LEDs, a reflector, in parabolic shape, to encase thed member and the plurality of LEDs, yellow phosphor, coated on the surface of the reflector facing the LEDs, and a supporting component, for connecting the member and the reflector in order to connect the LEDs, the member and the reflector together. The main feature of the present invention includes that the LEDs emit blue light when positively biased. The blue light triggers yellow phosphor to generate a yellow light, and the blue light mixed with the yellow light to become a white light. The white light is reflected by the reflector to project onto target objects.

A white LED lighting device and a light source for white LED lighting that enable an energy-saving, maintenance-free operation while ensuring ample illuminance.

Structure of a light source for white LED lighting, constituted by: inserting and holding a plurality of white LED elements in holding holes in a reflective plate, said plate being constituted by providing a required number of said holding holes, in a matrix-like array of prescribed pitch, in a plate of shape corresponding to the illuminating surface of a lamp body; fixing said plurality of white LED elements at locations 2 to 4 mm behind their respective electrode portions; attaching the positive and negative terminals of the white LED elements to a base plate for the LED elements, said base plate being disposed parallel to and directly behind the reflective plate; and forming, at the positive and negative terminals, a series-parallel electrical network suitable for the applied voltage.

Novel two-phase yellow phosphors are disclosed having a peak emission intensity at wavelengths ranging from about 555 nm to about 580 nm when excited by a radiation source having a wavelength ranging from 220 nm to 530 nm. The present phosphors may be represented by the formula a[Sr_x(M1)_1-x]_zSiO₄●(1-a)[Sr_y(M2)_1-y]_uSiO₅:Eu²⁺D, wherein M1 and M2 are at least one of a divalent metal such as Ba, Mg, Ca, and Zn, the values of a, x, y, z and u follow the following relationships: 0.6≦a≦0.85; 0.3≦x≦0.6; 0.85≦y≦1; 1.5≦z≦2.5; 2.6≦u≦3.3; and Eu and D each range from 0.001 to about 0.5. D is an anion selected from the group consisting of F, Cl, Br, S, and N, and at least some of the D anion replaces oxygen in the host silicate lattice of the phosphor. The present yellow phosphors have applications in high brightness white LED illumination systems, LCD display panels, plasma display panels, and yellow LEDs and illumination systems.

Disclosed are a white light-emitting diode (LED) in which an emission layer comprising a red luminous body and a green luminous body is formed on a blue LED, and a preparation method thereof. The emission layer comprises both of at least one inorganic phosphor and at least one semiconductor nanocrystal. The white LED prepared according to the present invention has excellent color purity, high luminous efficiency and improved light stability so that it can be advantageously used as a light source for various display devices.

A LED device which has an excellent color rendering property and no toxicity and does not bring about an increase in production cost more than necessary, and a covering member used for such a LED device can be provided. The white LED device comprises a light-emitting element for emitting light of blue to green region and a fluorescent substance containing a red phosphor for converting a wavelength of the light emitted from the light-emitting element. The red phosphor is CaS or activated by Eu or a phosphor expressed by a general formula AEu(1-x)LnxB2O8 wherein A is an element selected from the group consisting of Li, K, Na and Ag; Ln is an element selected from the group consisting of Y, La and Gd; and B is W or Mo; and x is number equal to or larger than 0, but smaller than 1.

A white LED device is described, including two LED dies capable of emitting a first color light and a second color light, respectively, and a phosphor layer coated on at least one of the two LED dies. The phosphor layer is capable of emitting a third color light when stimulated by the first or second color light, and a light mixing structure is also disposed to mix the first to third color lights into uniform white light without chromatic deviation.

An LED device comprises a white LED device and a red LED device. The white LED device has a substrate, a blue LED mounted on the substrate for emitting blue light, a transparent resin covering the blue LED and including phosphor particles. The phosphor particle has a quality to convert blue light to white light, if the particle contacts with the blue light. The red LED device has a substrate, a red LED mounted on the substrate for emitting red light, and a transparent resin covering the red LED device is disposed so that emitted red light mixes with the white light emitted from the white LED device.

A system and method for generating white light involves using a combination of white, red, green, and blue LEDs to produce white light and adjusting the emitted light in response to feedback signals. A light system has a light source that includes at least one white LED and multiple color LEDs and a spectral feedback control system configured to detect light that is output from the light source and to adjust the light that is output from the light source in response to the light detection. The spectral feedback control system may include a color sensor configured to provide color-specific feedback signals, a controller configured to generate color-specific control signals in response to the color-specific feedback signals, and a driver configured to generate color-specific drive signals in response to the color-specific control signals.

High power and high brightness light emitting diode (LED) assemblies emitting white light are disclosed. The present invention also discloses methods for cost effective mass production of the high power and high brightness LED assemblies with high throughput.

A white LED light source device and an LED backlight using the white LED light source can produce, among other features, white light with sufficient luminous intensity, uniform color tone, and high luminous utilization efficiency. A light path for producing white light with favorable color mixture can be shortened. The white LED light source device can be configured to include a bluish green LED lamp which can emit bluish green light by the combination of a blue LED device and a green phosphor material and a purple LED lamp which can emit purple light by the combination of a blue LED device and a red phosphor material. The bluish green light from the bluish green LED lamp and the purple light from the purple LED lamp are subjected to additive color mixture to produce white light with a spectrum containing three primary color wavelength components.

A method for manufacturing a triple wavelengths white LED chooses a blue LED chip whose wavelength is ranged between 430 nm and 480 nm. A red and green mixed phosphor is coated on the blue LED chip. Thus, the red and green mixed phosphor may be excited by the blue LED chip, thereby producing a triple wavelengths white LED.

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.

The invention discloses a high power white light emitting diode (LED) packaging structure and a packaging method. The high power white LED packaging structure mainly comprises an LED chip, a substrate, an internally sealed colloid, a fluorescent powder layer or a fluorescent powder adhesive layer and an externally sealed lens. The invention is characterized in that the LED chip is stuck on the substrate, a chip electrode is connected with a circuit layer on the substrate, the LED chip is covered by the internally sealed colloid, the outer surface of the internally sealed colloid is wrapped by the fluorescent powder layer or the fluorescent powder adhesive layer, and the outer surface of the fluorescent powder layer or the fluorescent powder adhesive layer is wrapped by the externally sealed lens. The invention has the advantages of promoting the light emitting effect of each layer through optically designing and packaging each layer of enveloped colloid of the LED chip, realizing mutually separate heat diffusion through a suitable process flow manufacture to isolate the fluorescent powder and the chip, having high light emitting efficiency and good light emitting stability, and being applied to packaging high power and high brightness LED.

An object of the present invention is to provide fluorescence showing a peak wavelength of excited spectrum within the wavelength range of from 350 to 500 nm and suitable for a white LED emitting yellow light, and a white LED comprising this fluorescence. This object achieved by phosphor for white. LED comprising a silicate fluorescent material and a borate fluorescent material.

The invention is a low voltage ceiling or wall mounted light fixture for residential and commercial lighting, having included a plurality of high lumen white LED lights incorporated within the fixtures, a light color diffusion panel and a household current to low voltage DC converter within the fixture to convert the AC current to low voltage DC current, saving on the cost of power required to provide illumination for the resident or commercial application and virtually eliminating the need to replace incandescent or fluorescent bulbs, the LED lights having an average duration of over 150,000 hours.

A back light unit having a light guide plate, a light guide bar connecting to the light guide plate, at least a white LED light source, and at least a color LED light source. Each of the LED light sources is positioned at a side of the light guide bar. The color LED light source compensates white light from the white LED light source that cannot produce preferable white light. Accordingly, the back light unit can produce white light that provides preferable color saturation to a display in cooperation of the white LED light source and the color LED light source.

An improved sensor (102) for hydration monitoring in mobile devices, wearables, security, illumination, photography, and other devices and systems uses an optional phosphor-coated broadband white LED (103) to produce broadband light (114), which is then transmitted along with any ambient light to target (125) such as the ear, face, or wrist of a living subject. Some of the scattered light returning from the target to detector (141) is passed through a narrowband spectral filter set (155) to produce multiple detector regions, each sensitive to a different waveband wavelength range, and the detected light is spectrally analyzed to determine a measure of hydration, such as fluid losses, fluid ingested, fluid balance, or rate of fluid loss, in part based on a noninvasive measure of components of the bloodstream. In one example, variations in components of the bloodstream over time such as hemoglobin and water are determined based on the detected light, and the measure of hydration is then determined based on the in components of the bloodstream over time. In the absence of the LED light, ambient light may be sufficient illumination for analysis. The same sensor can provide identifying features of type or status of a tissue target, such as heart rate or heart rate variability, respiratory status, or even confirmation that the tissue is alive. Hydration monitoring systems incorporating the sensor, as well as methods, are also disclosed.

An optical device for distributing light produced by a white LED or other light-producing device includes a lens portion that refracts the light to provide a desired light intensity distribution, and a collimating portion that internally reflects light from the white LED. The optical device may be molded from an acrylic polymer material or the like. The reduced thickness of the device facilitates low cycle times and reduces warpage or other distortion that would otherwise be generated during the molding process.

The present invention relates to a white light LED which has a high lighting efficiency, a good color displaying capability and has a plurality of afterglow colors or light storing capability. The present invention adopts at least two white light LED which have different peak value wave lengths and launching spectral and adjusts the two weights of the two fluorescences through the white LED to get the white LED lighting device which has a good color displaying capability, a high lighting efficiency, a plurality of afterglow colors and times.