13-08-2015 дата публикации
Номер: US20150226386A1
An efficient and stable, high-power, laser-driven white light source using one or more phosphors deposited on a thermally conductive substrate that is either transparent or reflective and placed at a remote distance from the laser source. The present invention relates generally to a high-power, laser-driven, white light source using one or more phosphors. 1. An apparatus for emitting white light , comprising:a laser source optically coupled to one or more phosphors, wherein the laser source emits light in a first wavelength range that is converted to light in a second wavelength range by the phosphors, and the phosphors are deposited on a substrate that is placed at a remote distance from the laser source.2. The apparatus of claim 1 , wherein the laser source comprises a near-ultraviolet (UV) or blue light emitting laser diode emitting in the first wavelength range from about 300 nm to about 500 nm.3. The apparatus of claim 2 , wherein the light in the second wavelength range has a longer wavelength than the light in the first wavelength range.4. The apparatus of claim 3 , wherein the phosphors down-convert part or all of the light emitted by the near-UV or blue light emitting laser diode to light having longer wavelengths claim 3 , including blue claim 3 , green claim 3 , yellow and red light claim 3 , ranging from about 400 nm to about 800 nm.5. The apparatus of claim 1 , wherein the emitted white light has a color temperature ranging from about 2000 K to about 7000 K.6. The apparatus of claim 1 , wherein the emitted white light has a color rendering index ranging from about 60 to about 100.7. The apparatus of claim 1 , wherein the emitted white light has a luminous efficacy greater than about 15 lumens per Watt.8. The apparatus of claim 1 , wherein a surface of the phosphors is shaped claim 1 , patterned or roughened.9. The apparatus of claim 1 , wherein the substrate is transparent.10. The apparatus of claim 1 , wherein the substrate is reflective.11. The ...
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