LIGHT EMITTING DEVICE, METHOD FOR MANUFACTURING THE SAME AND APPARATUS FOR MANUFACTURING LIGHT EMITTING DEVICE
First Claim
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1. A light emitting device, comprising:
- a package member;
a light emitting element provided in the package member;
a first phosphor layer provided on the light emitting element and having a first phosphor; and
a second phosphor layer provided above the first phosphor layer and having a second phosphor,a luminescent efficiency of the first phosphor being higher than a luminescent efficiency of the second phosphor.
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Abstract
According to one embodiment, a light emitting device includes a package member, a light emitting element provided in the package member, a first phosphor layer and a second phosphor layer. A first phosphor layer is provided on the light emitting element and has a first phosphor. A second phosphor layer is provided on the first phosphor layer and has a second phosphor. A luminescent efficiency of the first phosphor is higher than a luminescent efficiency of the second phosphor.
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Citations
17 Claims
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1. A light emitting device, comprising:
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a package member; a light emitting element provided in the package member; a first phosphor layer provided on the light emitting element and having a first phosphor; and a second phosphor layer provided above the first phosphor layer and having a second phosphor, a luminescent efficiency of the first phosphor being higher than a luminescent efficiency of the second phosphor. - View Dependent Claims (2, 3)
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4. A method for manufacturing a light emitting device including a package member, a light emitting element provided in the package member, a first phosphor layer provided on the light emitting element and having a first phosphor, and a second phosphor layer provided on the first phosphor layer and having a second phosphor, the method comprising:
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determining previously a dependence property of chromaticities of a mixed light emitted from the light emitting element, the first phosphor, and the second phosphor on a wavelength and an intensity of a light emitted from the light emitting element, a first total weight of the first phosphor, or a second total weight of the second phosphor; measuring the wavelength and the intensity of the light emitted from the light emitting element; determining the first total weight and the second total weight individually based on the dependence property so as to obtain predetermined chromaticities of the mixed light including the measured wavelength and the measured intensity; covering at least a part of the light emitting element with the first phosphor layer containing the first phosphor of the first total weight; and covering at least a part of the first phosphor layer with the second phosphor layer containing the second phosphor of the second total weight. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for manufacturing a light emitting device including a package member, a light emitting element provided in the package member, a first phosphor layer provided on the light emitting element and having a first phosphor, and a second phosphor layer provided on the first phosphor layer and having a second phosphor, the apparatus comprising:
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a memorizing unit configured to store a dependence property of chromaticities of a mixed light emitted from the light emitting element, the first phosphor, and the second phosphor on a wavelength and an intensity of a light emitted from the light emitting element, a first total weight of the first phosphor, or a second total weight of the second phosphor; a measuring unit configured to measure the wavelength and the intensity of the light emitted from the light emitting element; a determining unit configured to determine the first total weight and the second total weight individually based on the dependence property so as to obtain predetermined chromaticities of the mixed light including the measured wavelength and the measured intensity; a first covering unit configured to cover at least a part of the light emitting element with a first phosphor layer containing the first phosphor of the first total weight; and a second covering unit configured to cover at least a part of the first phosphor layer with a second phosphor layer containing the second phosphor of the second total weight. - View Dependent Claims (16, 17)
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Specification