White LED, and backlight and liquid crystal display device using the same
First Claim
1. A white LED, comprising:
- a light emitting element with a light emission peak wavelength in a range of 380 to 420 nm; and
a phosphor layer containing three or more types of phosphors including at least a blue phosphor, a green phosphor, and a red phosphor,wherein the phosphor layer has a first phosphor layer containing a mixture of the green phosphor and the red phosphor, and a second phosphor layer containing the blue phosphor and disposed on an opposite side of a side of the light emitting element of the first phosphor layer;
wherein a content of the blue phosphor in an entire phosphor contained in the first phosphor layer is 5 mass % or less, or the blue phosphor is not contained in the first phosphor layer,wherein a content of phosphor other than the blue phosphor in an entire phosphor contained in the second phosphor layer is 5 mass % or less, or no phosphor other than the blue phosphor is contained in the second phosphor layer,wherein a ratio of a content of the green phosphor to a content of the red phosphor in the first phosphor layer is in a range of 0.05 to 0.4, andwherein a ratio of a thickness of the second phosphor layer to a thickness of the first phosphor layer is in a range of 1 to 3.
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Accused Products
Abstract
A white LED includes a light emitting element with a light emission peak wavelength equal to or longer than 380 nm and equal to or shorter than 420 nm, and a phosphor layer containing three or more types of phosphors including at least a blue phosphor, a green phosphor, and a red phosphor and disposed in a manner to cover at least part of the light emitting element. The phosphor layer has a first phosphor layer and a second phosphor layer disposed in an opposite side of a side of the light emitting element of the first phosphor layer. In the first phosphor layer, a content of the blue phosphor in an entire phosphor contained in the first phosphor layer is equal to or less than 5 mass %, or the blue phosphor is not contained. In the second phosphor layer, a content of phosphor other than the blue phosphor in an entire phosphor contained in the second phosphor layer is equal to or less than 5 mass %, or no phosphor other than the blue phosphor is contained.
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Citations
9 Claims
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1. A white LED, comprising:
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a light emitting element with a light emission peak wavelength in a range of 380 to 420 nm; and a phosphor layer containing three or more types of phosphors including at least a blue phosphor, a green phosphor, and a red phosphor, wherein the phosphor layer has a first phosphor layer containing a mixture of the green phosphor and the red phosphor, and a second phosphor layer containing the blue phosphor and disposed on an opposite side of a side of the light emitting element of the first phosphor layer; wherein a content of the blue phosphor in an entire phosphor contained in the first phosphor layer is 5 mass % or less, or the blue phosphor is not contained in the first phosphor layer, wherein a content of phosphor other than the blue phosphor in an entire phosphor contained in the second phosphor layer is 5 mass % or less, or no phosphor other than the blue phosphor is contained in the second phosphor layer, wherein a ratio of a content of the green phosphor to a content of the red phosphor in the first phosphor layer is in a range of 0.05 to 0.4, and wherein a ratio of a thickness of the second phosphor layer to a thickness of the first phosphor layer is in a range of 1 to 3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification