Phosphor for light sources and associated light source
AssigneesPatent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH, Osram Opto Semiconductors GmbH & Co. OHG
InventorsFranz Kummer, Franz Zwaschka, Andries Ellens, Alexandra Debray, Guenther Waitl
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Abstract
A phosphor for light sources, the emission from which lies in the short-wave optical spectral region, as a garnet structure A3B5O12. It is activated with Ce, the second component B representing at least one of the elements Al and Ga, and the first component A is terbium or terbium together with at least one of the elements Y, Gd, La and/or Lu. In a preferred embodiment, a phosphor having a garnet of structure (Tb1-x-yRExCey)3(Al,Ga)5O12, where RE=Y, Gd, La and/or Lu; 0≦x≦0.5-y; 0<y<0.1 is used.
Claims23
A white light-emitting device comprising:
- a light-emitting diode that emits blue light;
- and
- a phosphor that converts at least a part of the blue light into longer-wavelength radiation, wherein the phosphor is an Al-containing Tb-garnet phosphor, a Ga-containing Tb-garnet phosphor, a Ga,Al-containing Tb-garnet phosphor, or a mixture thereof, whereby the device emits white light.
A device that produces white light, the device comprising:
- a light-emitting diode that emits blue light;
- and
- a yellow-emitting phosphor, wherein the phosphor is a cerium-activated terbium aluminate that converts at least a part of the blue light from the light-emitting diode into yellow light, the device emitting a mix of at least blue light and yellow light to produce white light.
A light-emitting device comprising:
- a light-emitting diode that emits blue light;
- and
- a phosphor that converts at least a part of the blue light into longer-wavelength radiation, wherein the phosphor is an Al-containing Tb-garnet phosphor, a Ga-containing Tb-garnet phosphor, a Ga,Al-containing Tb-garnet phosphor, or a mixture thereof.
A device that produces light, the device comprising:
- a light-emitting diode that emits blue light;
- and
- a yellow-emitting phosphor, wherein the phosphor is a cerium-activated terbium aluminate that converts at least a part of the blue light from the light-emitting diode into yellow light.
Dependencies are inferred from the claim text.