Semiconductor light emitting device including a fluorescent material
First Claim
1. A semiconductor light emitting element comprising:
- a light emitting layer for emitting primary light having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting layer to absorb said primary light emitted from said light emitting layer and to emit secondary light having a second wavelength different from said first wavelength; and
a first optical reflector located in the light extraction side of said wavelength converter, and having a low reflectance to said secondary light emitted from said wavelength converter and a high reflectance to said primary light emitted from said light emitting layer.
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Accused Products
Abstract
A light emitting device or image display includes a fluorescent material as a wavelength converter for converting a wavelength into another. The fluorescent material is disposed in a predetermined positional relation, to prevent external leakage of primary light and to extract secondary light made by wavelength-converting the primary light with a very high efficiency. By using a semiconductor light emitting element for ultraviolet emission and combining it with a fluorescent material or any other appropriate material having a wavelength converting function, various kinds of applications, such as illuminator, having a remarkably long-life light source can be made. The semiconductor light emitting element preferably has a emission wavelength near 330 nm, and preferably uses BGaN in its light emitting layer.
57 Citations
20 Claims
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1. A semiconductor light emitting element comprising:
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a light emitting layer for emitting primary light having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting layer to absorb said primary light emitted from said light emitting layer and to emit secondary light having a second wavelength different from said first wavelength; and
a first optical reflector located in the light extraction side of said wavelength converter, and having a low reflectance to said secondary light emitted from said wavelength converter and a high reflectance to said primary light emitted from said light emitting layer. - View Dependent Claims (2, 3, 4)
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5. A semiconductor light emitting element comprising:
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a light emitting layer for emitting primary light having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting layer to absorb said primary light emitted from said light emitting layer and to emit secondary light having a second wavelength different from said first wavelength;
a second optical reflector located on one side of said light emitting layer opposite from the light extraction side to reflect said primary light; and
a first optical reflector located in the light extraction side of said wavelength converter, and having a low reflectance to said secondary light emitted from said wavelength converter and a high reflectance to said primary light emitted from said light emitting layer.
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6. A semiconductor light emitting element comprising:
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a light emitting layer for emitting primary light having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting layer to absorb said primary light emitted from said light emitting layer and to emit secondary light having a second wavelength different from said first wavelength;
a third optical reflector configured to enclose said light emitting layer except the light extraction part to reflect said primary light emitted from said light emitting layer; and
a first optical reflector located in the light extraction side of said wavelength converter, and having a low reflectance to said secondary light emitted from said wavelength converter and a high reflectance to said primary light emitted from said light emitting layer.
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7. A semiconductor light emitting element comprising:
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a light emitting layer for emitting primary light having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting layer to absorb said primary light emitted from said light emitting layer and to emit secondary light having a second wavelength different from said first wavelength; and
a fourth optical reflector located between said light emitting layer and said wavelength converter, and having a low reflectance to said primary light and a high reflectance to said secondary light. - View Dependent Claims (8, 9, 10)
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11. A semiconductor light emitting device comprising:
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a packaging member;
a semiconductor light emitting element packaged on said packaging member to emit primary fight having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting element to absorb said primary light emitted from said light emitting element and to emit secondary light having a second wavelength different from said first wavelength; and
a first optical reflector located in the light extraction side of said wavelength converter, and having a low reflectance to said secondary light emitted from said wavelength converter and a high reflectance to said primary light emitted from said light emitting element. - View Dependent Claims (12, 13, 14)
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15. A semiconductor light emitting device comprising:
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a packaging member;
a semiconductor light emitting element packaged on said packaging member to emit primary light having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting element to absorb said primary light emitted from said light emitting element and to emit secondary light having a second wavelength different from said first wavelength;
a second optical reflector located on one side of said light emitting element opposite from the light extraction side to reflect said primary light; and
a first optical reflector located in the light extraction side of said wavelength converter, and having a low reflectance to said secondary light emitted from said wavelength converter and a high reflectance to said primary light emitted from said light emitting element.
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16. A semiconductor light emitting device comprising:
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a packaging member;
a semiconductor light emitting element packaged on said packaging member to emit primary light having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting element to absorb said primary light emitted from said light emitting element and to emit secondary light having a second wavelength different from said first wavelength;
a third optical reflector configured to enclose said light emitting element except the light extraction part to reflect said primary light emitted from said light emitting element; and
a first optical reflector located in the light extraction side of said wavelength converter, and having a low reflectance to said secondary light emitted from said wavelength converter and a high reflectance to said primary light emitted from said light emitting element.
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17. A semiconductor light emitting device comprising:
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a packaging member;
a semiconductor light emitting element packaged on said packaging member to emit primary light having a first wavelength;
a wavelength converter located in the light extraction side of said light emitting element to absorb said primary light emitted from said light emitting element and to emit secondary light having a second wavelength different from said first wavelength; and
a fourth optical reflector located between said light emitting element and said wavelength converter, and having a low reflectance to said primary light and a high reflectance to said secondary light. - View Dependent Claims (18, 19, 20)
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Specification