Illumination device with multi-color light-emitting elements

Patent metadata

Field	Value
Publication number	US-2016018065-A1
Application number	US-201414773301-A
Country	US
Kind code	A1
Filing date	Mar 7, 2014
Priority date	Mar 7, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

A variety of illumination devices for general illumination utilizing solid state light sources (e.g., light-emitting diodes) are disclosed. In general, an illumination device can include multiple light sources that are disposed on a substrate, where at least some of the light sources include a light-emitting diode (LED) and a corresponding inelastic scattering element surrounding, at least in part, the LED. The inelastic scattering elements can have different light emission spectra. The illumination device can further include a light-mixing element adapted to receive light that is output by the light sources, where, during operation of the illumination device, each inelastic scattering element inelastically scatters light emitted from its corresponding LED, and the light-mixing element mixes the light received from the inelastic scattering elements to provide the output light.

First claim

1 - 24 . (canceled)

25 . An illumination device for generating output light, comprising:
a substrate having a first surface; a plurality of light sources disposed on the first surface and arranged separate from each other, each of the light sources comprising a pump light and an inelastic scattering element arranged to receive light from the pump light and being configured to generate colored light having a color light emission spectrum that is wider than a main peak included in a spectrum of light emitted by the pump light, wherein at least two inelastic scattering elements have different color light emission spectra; and a light-mixing element adapted to receive light that is output by the plurality of light sources, wherein, during operation of the illumination device, each inelastic scattering element inelastically scatters light from its corresponding pump light, and the light-mixing element mixes light received from the plurality of inelastic scattering elements to provide the output light.

26 . The illumination device of claim 25 , wherein each pump light includes at least one of lasers or light-emitting diodes.

27 . The illumination device of claim 25 , wherein each pump light emits light having different colors.

28 . The illumination device of claim 27 , wherein at least one pump light emits blue light and at least one another pump light emits green light.

29 . The illumination device of claim 25 , wherein the inelastic scattering elements comprise a quantum dot phosphor material.

30 . The illumination device of claim 25 , wherein the inelastic scattering elements have a dome shape.

31 . The illumination device of claim 25 , wherein each inelastic scattering element is spaced apart from its corresponding pump light and has an inner surface facing the pump light.

32 . The illumination device of claim 31 , wherein at least some of the light sources comprise a medium adjacent to the inner surface of the inelastic scattering element that has a refractive index that is smaller than a refractive index of the inelastic scattering element.

33 . The illumination device of claim 32 , wherein the medium is air.

34 . The illumination device of claim 32 , wherein the medium is a silicone.

35 . The illumination device of claim 25 , wherein at least a portion of the first surface is a diffusely reflecting surface.

36 . The illumination device of claim 25 , wherein at least a portion of the first surface is a specularly reflecting surface.

37 . The illumination device of claim 25 , further comprising electrical connections for connecting the plurality of light sources to a power source, the electrical connections arranged such that power to at least some of the plurality of light sources is separately adjustable.

38 . The illumination device of claim 25 , further comprising electrical connections for connecting the plurality of light sources to a power source, the electrical connections being arranged such that power to each of the plurality of light sources is separately adjustable.

39 . The illumination device of claim 25 , wherein the light-mixing element is a light guide.

40 . The illumination device of claim 25 , wherein the light-mixing element is an elastic scattering element.

41 . The illumination device of claim 25 , wherein the plurality of light sources and the light-mixing element are adapted such that the output light has substantially uniform color.

42 - 58 . (canceled)

59 . The illumination device of claim 25 , wherein the output light has a spectral density distribution based on a superposition of the color light emission spectra of the plurality of light sources and the superposition is configured to match a target spectral power distribution of white light having a predetermined correlated color temperature within 10%.

60 . The illumination device of claim 25 , wherein each color emission spectrum includes a local maximum within 50 nm of the peak included in the spectrum of the light emitted by the corresponding pump light.

61 . The illumination device of claim 25 further including one or more collimating elements adapted to receive light from the plurality of light sources and configured to output light into the light-mixing element.

62 . The illumination device of claim 25 , wherein the light-mixing element is adapted to maintain or collimate a spatial distribution of light provided by the plurality of light sources.

63 . The illumination device of claim 25 , wherein the plurality of light sources and the light-mixing element are adapted such that the output light has substantially uniform luminance.

Assignees

• Quarkstar Llc

Inventors

• Schinagl Ferdinand

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H05B45/20

  Controlling the colour of the light · CPC title

• H05B45/24

  using electrical feedback from LEDs or from LED modules · CPC title

• H05B45/46

  having LEDs disposed in parallel lines · CPC title

• H05B45/22

  using optical feedback · CPC title