LIGHT EMITTING DEVICE AND FABRICATING METHOD THEREOF
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Abstract
A light-emitting device includes a light-emitting element for emitting primary light, and a wavelength conversion unit for absorbing part of the primary light and emitting secondary light having a wavelength longer than that of the primary light, wherein the wavelength conversion unit includes plural kinds of phosphors having light absorption characteristics different from each other, and then at least one kind of phosphor among the plural kinds of phosphors has an absorption characteristic that can absorb the secondary light emitted from at least another kind of phosphor among the plural kinds of phosphors.
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Citations
34 Claims
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1-24. -24. (canceled)
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25. A light-emitting device, comprising:
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a light-emitting element for emitting primary light; and a wavelength conversion unit for absorbing part of the primary light and emitting secondary light having a wavelength longer than that of the primary light, wherein said wavelength conversion unit includes plural kinds of phosphors different in light absorption characteristic from each other, at least one kind of phosphor among said plural kinds of phosphors has an absorption characteristic that can absorb the secondary light emitted by at least another kind of phosphor among said plural kinds of phosphors, and said plural kinds of phosphors have median sizes different from each other, and by mixing wavelength components of the primary light emitted from said light-emitting element and wavelength components of the secondary light emitted from said plural kinds of phosphors, the light-emitting device emits light at a chromaticity regarded as blackbody radiation at a prescribed color temperature. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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34. A fabrication method of a light-emitting device, comprising the steps of:
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mounting a light-emitting element on a bottom surrounded by a reflective surface of an inner wall in a package; introducing a liquid resin kneaded with plural kinds of phosphors having different median values of particle sizes, to cover said light-emitting element mounted in said package; and leaving said introduced liquid resin at rest for a prescribed time period to cause the phosphor particles to settle such that a particular kind of the phosphor having a greater median value of the particle size has a greater concentration near said light-emitting element.
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Specification