MULTIPLE COMPONENT SOLID STATE WHITE LIGHT

• US 20100290221A1
• Filed: 07/28/2010
• Published: 11/18/2010
• Est. Priority Date: 05/01/2003
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: TARSA, ERIC JOSEPH, Keller, Bernd, Dunn, Michael
• Granted Patent: US 8,901,585 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A white light emitting lamp is disclosed comprising a solid state ultra violet (UV) emitter that emits light in the UV wavelength spectrum. A conversion material is arranged to absorb at least some of the light emitting from the UV emitter and re-emit light at one or more different wavelengths of light. One or more complimentary solid state emitters are included that emit at different wavelengths of light than the UV emitter and the conversion material. The lamp emits a white light combination of light emitted from the complimentary emitters and from the conversion material, with the white light having high efficacy and good color rendering. Other embodiments of white light emitting lamp according to the present invention comprises a solid state laser instead of a UV emitter. A high flux white emitting lamp embodiment according to the invention comprises a large area light emitting diode (LED) that emits light at a first wavelength spectrum and includes a conversion material. A plurality of complimentary solid state emitters surround the large area LED, with each emitter emitting light in a spectrum different from the large area LED and conversion material such that the lamp emits a balanced white light. Scattering particles can be included in each of the embodiments to scatter the light from the emitters, conversion material and complimentary emitters to provide a more uniform emission.

Claims

1. A method for producing white light with high efficacy and good color rendering, comprising:

generating light in the UV wavelength spectrum;

passing said UV light through a conversion material that absorbs said UV light and re-emits light at one or more different wavelength spectrums;

generating complimentary light at one or more wavelength spectrums that is different from said conversion material wavelength spectrums; and

combining said conversion material light and said complimentary light to generate white light with high efficacy and good color rendering.

2. The method of claim 1, further comprising scattering said conversion material light and said complimentary light to generate substantially uniform white light.

3. A method for producing white light with high efficacy and good color rendering, comprising:

generating laser light;

passing said laser light through a conversion material that absorbs at least some of said laser light and re-emits light at one or more different wavelength spectrums;

generating complimentary light at one or more wavelength spectrums that is different from said conversion material wavelength spectrums; and

combining said conversion material light and said complimentary light to generate white light with high efficacy and good color rendering.