White light illumination device
First Claim
Patent Images
1. An illumination device for generating white light, comprising:
- a light source that generates blue light;
a converter that converts the blue light into yellow light of a color location near a white point in a chromaticity diagram, the converter comprising a material providing conversion of the blue light into the yellow light with a quantum efficiency of more than 70% at operating temperatures in a range from 200°
C. to 250°
C.; and
a filter that attenuates a green light component of the yellow light emitted from the converter to obtain the white light.
1 Assignment
0 Petitions
Accused Products
Abstract
An illumination device for generating white light is provided. The device includes a converter and a filter. The converter has a Ce:YAG ceramic, which converts blue excitation light into yellow light of a color location near the white point in the chromaticity diagram. The filter attenuates a light fraction below 530 nm so as to obtain the white light.
-
Citations
14 Claims
-
1. An illumination device for generating white light, comprising:
-
a light source that generates blue light; a converter that converts the blue light into yellow light of a color location near a white point in a chromaticity diagram, the converter comprising a material providing conversion of the blue light into the yellow light with a quantum efficiency of more than 70% at operating temperatures in a range from 200°
C. to 250°
C.; anda filter that attenuates a green light component of the yellow light emitted from the converter to obtain the white light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An illumination device for generating white light, comprising:
-
a light source that generates blue light; a converter that converts the blue light into yellow light of a color location near a white point in a chromaticity diagram; and a filter that attenuates a green light component of the yellow light emitted from the converter to obtain the white light, wherein the converter transmits from 10% to 30% of the blue light such that absorbed light is converted into the yellow light.
-
-
10. An illumination device for generating white light, comprising:
-
a light source that generates blue light; a converter that converts the blue light into yellow light of a color location near a white point in a chromaticity diagram; a filter that attenuates a green light component of the yellow light emitted from the converter to obtain the white light; and a selective metallic mirror diaphragm on a side of the converter that faces the light source, the selective metallic mirror diaphragm having an aperture through which the blue light enters the converter and which passes short-wavelength light arriving at the converter, while converted long-wavelength light is reflected at the selective metallic mirror diaphragm so as to obtain, in a transmission configuration, a resultant white emission spectrum from the blue light, directly converted light from the light source, and remitted light after reflection at the selective metallic mirror diaphragm.
-
-
11. An illumination device for generating white light, comprising:
-
a light source that generates blue light; a converter that converts the blue light into yellow light of a color location near a white point in a chromaticity diagram; a filter that attenuates a green light component of the yellow light emitted from the converter to obtain the white light; and a selective metallic mirror diaphragm on a side of the converter that faces the light source, the selective metallic mirror diaphragm having an aperture through which the blue light enters the converter, the converter transmitting from 10% to 30% of the blue light such that absorbed light is converted into the yellow light.
-
-
12. An illumination device for generating white light, comprising:
-
a light source that generates blue light; a converter that converts the blue light into yellow light of a color location near a white point in a chromaticity diagram; and a filter that attenuates a green light component of the yellow light emitted from the converter to obtain the white light, wherein the filter is a band-stop filter on a side of the converter that faces the light source, and wherein the filter is a band stop filter on a side of the converter facing away from the light source, the band-stop filter having an anti-reflective effect for blue wavelengths and for longer, yellow-red emission wavelengths and therefore promotes emission of light of said wavelengths from the converter relative to central green-yellow spectral components, in a remission configuration.
-
-
13. An illumination device for generating white light, comprising:
-
a light source that generates blue light; a converter that converts the blue light into yellow light of a color location near a white point in a chromaticity diagram; and a filter that attenuates a green light component of the yellow light emitted from the converter to obtain the white light, wherein the filter is on a side of the converter that faces away from the light source, the filter being bonded to a plate-shaped heat sink by a heat conductive adhesive or solder in a manner that forms a mirror effective so that long-wavelength light generated in the converter is mostly reflected, while short-wavelength green light exits through the filter into the heat conductive adhesive or the solder for being absorbed, whereby the light exiting in a remission configuration in total occupies a color location in the white region of the chromaticity diagram.
-
-
14. An illumination device for generating white light, comprising:
-
a light source that generates blue light; a converter that converts the blue light into yellow light of a color location near a white point in a chromaticity diagram; and a filter that attenuates a green light component of the yellow light emitted from the converter to obtain the white light, wherein the filter is a dichroic reflective mirror with a green pass-band in a range from 480 to 530 nm, which depletes the green component of light emitted from the converter.
-
Specification