The systems and methods described herein relate to LED systems capable of generating light, such as for illumination or display purposes. The light-emitting LEDs may be controlled by a processor to alter the brightness and/or color of the generated light, e.g., by using pulse-width modulated signals. Thus, the resulting illumination may be controlled by a computer program to provide complex, predesigned patterns of light in virtually any environment.

Multicolored led lighting method and apparatus

High-brightness LEDs, combined with a processor for control, can produce a variety of pleasing effects for display and illumination. A system disclosed herein uses high-brightness, processor-controlled LEDs in combination with diffuse materials to produce color-changing effects. The systems described herein may be usefully employed to bring autonomous color-changing ability and effects to a variety of consumer products and other household items. The system may also include sensors so that the illumination of the LEDs might change in response to environmental conditions or a user input. Additionally, the system may include an interface to a network, so that the illumination of the LEDs may be controlled via the network.

Light emitting diode based products

A lighting device comprising first and second groups of solid state light emitters, which emit light having peak wavelength in ranges of from 430 nm to 480 nm, and first and second groups of lumiphors which emit light having dominant wavelength in the range of from 555 nm to 585 nm. In some embodiments, 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 have a correlated color temperature which differs by at least 50 K from a correlated color temperature which would be emitted by a combination of (3) light exiting the lighting device which was emitted by the second group of emitters, and (4) light exiting the lighting device which was emitted by the second group of lumiphors.

Lighting device and lighting method

A nanocrystal capable of light emission includes a nanoparticle having photoluminescence having quantum yields of greater than 30%.

Highly luminescent color-selective nanocrystalline materials

A light emitting device (10) using an LED, comprising a mounting substrate (1), a light emitting element (2) mounted on the mounting substrate (1) with its face down, a fluorescent member (3) disposed to face the light-outgoing surface (S) of the light emitting element (2) in non-contact with the element (2), and an optical member (4) that distributes to the outside of the device a light beam shone thereinto from the element (2) via the member (3). A light beam from the element (2) is shone into the member (3) to excite a phosphor, and the phosphor emits a light beam having a wavelength different from that of the incident light. A light beam from the element (2) that has passed through the member (3) without being absorbed by the member and a light beam emitted from the phosphor are incident into the optical member (4) and distributed. The fluorescent member (3), being not in contact with the element (2), never receive the heat of the element (2) through heat conduction and is protected against deterioration by heat. A face-down mounting allows the fluorescent member (3) and the optical member (4) to approach the element (2) as long as they are kept out of contact with the element (2). As a result, light can be efficiently picked up whole prolonging the life of an easy-to-deteriorate phosphor or phosphor-containing resin, and light can be distributed in a specified direction.

Light emitting device using LED

The invention relates to a light source comprising a phosphor composition and a light emitting device such as an LED or a laser diode. The phosphor composition absorbs radiation having a first spectrum and emits radiation having a second spectrum and comprises at least one of: YBO3:Ce3+,Tb3+; BaMgAl?10?O17:Eu?2+, Mn2+?; (Sr,Ca,Ba)(Al,Ga)?2?S4:Eu?2+?; and Y?3?Al5O12-Ce?3+?; and at least one of: Y?2?O2S:Eu?3+,Bi3+; YVO?4:Eu3+,Bi3+; SrS:Eu2+; SrY2S4:Eu2+; CaLa?2?S4:Ce?3+?; and (Ca,Sr)S:Eu2+. The phosphor composition and the light source together can produce white light with pleasing characteristics, such as a color temperature of 3000-6500° K, a color rendering index of about 83-87, and a device luminous efficacy of about 10-20 lumens per watt.

Light emitting device with phosphor composition

Ca 8 Mg(SiO 4 ) 4 Cl 2 :Eu 2+ ,Mn 2+ and Y 2 O 3 :Eu 3+ ,Bi 3+ are phosphors which have been sensitized to absorb ultraviolet radiation, such as from a light emitting diode, and to convert the radiation into visible light. A phosphor conversion material blend comprises Ca 8 Mg(SiO 4 ) 4 Cl 2 :Eu 2+ ,Mn 2+ ; Y 2 O 3 :Eu 3+ ,Bi 3+ , and known blue phosphors that absorb ultraviolet radiation from a LED and convert the radiation into visible bright white light. Also, a light emitting assembly comprises at least one of a red, green and blue phosphor for absorbing and converting ultraviolet radiation into visible light. A laser diode can be used to activate the phosphors to provide improved efficiency and brightness.

Phosphors for white light generation from UV emitting diodes

There is provided a white light illumination system. The illumination system includes a radiation source which emits either ultra-violet (UV) or x-ray radiation. The illumination system also includes a luminescent material which absorbs the UV or x-ray radiation and emits the white light. The luminescent material has composition A2−2xNa1+xExD2V3O12. A may be calcium, barium, strontium, or combinations of these three elements. E may be europium, dysprosium, samarium, thulium, or erbium, or combinations thereof. D may be magnesium or zinc, or combinations thereof. The value of x ranges from 0.01 to 0.3, inclusive.

Single phosphor for creating white light with high luminosity and high CRI in a UV led device

A phosphor composition absorbs ultraviolet radiation and emits a green visible light. The phosphor composition comprises at least one of: Ba2SiO4:Eu2+; Ba2MgSi2O7:Eu2+; Ba2ZnSi2O7:Eu2+; BaAl2O4:Eu2+; SrAl2O4:Eu2+; and BaMg2Al16O27:Eu2+,Mn2+. Further, when the green-light emitting phosphor is combined with appropriate red and blue phosphors in a phosphor conversion material blend, and the phosphor conversion material blend absorbs ultraviolet radiation, and emits a bright white light with high brightness and quality. The ultraviolet radiation source may comprise a semiconductor ultraviolet radiation source.

Green-light emitting phosphors and light sources using the same

A lamp having improved color quality scale, especially at elevated color temperatures, is provided. The light generated by the light-emitting elements of the lamp, when the lamp is energized, has delta chroma values for fifteen color samples of the color quality scale within select parameters. The delta chroma values are measured in the CIE LAB color space.

William Winder Beers

Papers

Light emitting device with phosphor composition

Phosphors for white light generation from UV emitting diodes

Single phosphor for creating white light with high luminosity and high CRI in a UV led device

Green-light emitting phosphors and light sources using the same

Enhanced color contrast light source at elevated color temperatures