Light-emitting device having a support substrate and inclined sides
First Claim
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1. A light-emitting device comprising:
- a support substrate;
a nitride-based semiconductor element layer on the support substrate, having a first surface which is a light emission surface and a second surface which faces the support substrate, the semiconductor element layer having an active layer having a third surface which faces the light emission surface and a fourth surface which faces the support substrate, the third and fourth surfaces opposite to each other, a first semiconductor layer between the first surface and the third surface, and a second semiconductor layer between the second surface and the fourth surface, wherein the light emission surface emits light to be created in the active layer; and
a reflecting film between the support substrate and the second semiconductor layer, whereinthe second surface is bonded to the support substrate through the reflecting film,the first semiconductor layer has a thickness from the light emission surface to the third surface, and the second semiconductor layer has a thickness from the second surface to the fourth surface,the thickness of the first semiconductor layer is greater than the thickness of the second semiconductor layer,the semiconductor element layer has a side surface inclined with respect to the light emission surface such that the semiconductor element layer is tapered toward the light emission surface, the inclined side surface being inclined linearly and continuously extending from an edge of the second surface to an edge of the light emission surface,the reflecting film has a fifth surface in contact with the second surface, and a sixth surface opposite to the fifth surface, the reflecting film having a side surface which extends from an edge of the fifth surface to an edge of the sixth surface and is inclined with respect to the inclined side surface of the semiconductor element layer, the inclined side surface of the semiconductor element layer extending to reach the fifth surface, andthe semiconductor element layer has a first angle formed by the inclined side surface of the semiconductor element layer and the light emission surface, the reflecting film has a second angle formed by the side surface of the reflecting film and the fifth surface, and the first angle is greater than the second angle.
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Abstract
A light-emitting device capable of improving light extraction efficiency is provided. This light-emitting device comprises a support substrate set on a side opposite to a light emission surface and a semiconductor element layer, bonded to the support substrate, having a side surface inclined by a prescribed angle with respect to at least the normal of the light emission surface.
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Citations
19 Claims
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1. A light-emitting device comprising:
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a support substrate; a nitride-based semiconductor element layer on the support substrate, having a first surface which is a light emission surface and a second surface which faces the support substrate, the semiconductor element layer having an active layer having a third surface which faces the light emission surface and a fourth surface which faces the support substrate, the third and fourth surfaces opposite to each other, a first semiconductor layer between the first surface and the third surface, and a second semiconductor layer between the second surface and the fourth surface, wherein the light emission surface emits light to be created in the active layer; and a reflecting film between the support substrate and the second semiconductor layer, wherein the second surface is bonded to the support substrate through the reflecting film, the first semiconductor layer has a thickness from the light emission surface to the third surface, and the second semiconductor layer has a thickness from the second surface to the fourth surface, the thickness of the first semiconductor layer is greater than the thickness of the second semiconductor layer, the semiconductor element layer has a side surface inclined with respect to the light emission surface such that the semiconductor element layer is tapered toward the light emission surface, the inclined side surface being inclined linearly and continuously extending from an edge of the second surface to an edge of the light emission surface, the reflecting film has a fifth surface in contact with the second surface, and a sixth surface opposite to the fifth surface, the reflecting film having a side surface which extends from an edge of the fifth surface to an edge of the sixth surface and is inclined with respect to the inclined side surface of the semiconductor element layer, the inclined side surface of the semiconductor element layer extending to reach the fifth surface, and the semiconductor element layer has a first angle formed by the inclined side surface of the semiconductor element layer and the light emission surface, the reflecting film has a second angle formed by the side surface of the reflecting film and the fifth surface, and the first angle is greater than the second angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification
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Current AssigneeEpistar Corporation (Ennostar, Inc.)
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Original AssigneeSanyo Electric Company Limited (Panasonic Holdings Corporation)
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InventorsKunisato, Tatsuya, Hata, Masayuki
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Primary Examiner(s)Weiss; Howard
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Application NumberUS11/059,508Publication NumberTime in Patent Office2,322 DaysField of Search257/98, 257/99US Class Current257/98CPC Class CodesH01L 2933/0016 relating to electrodesH01L 2933/0091 Scattering means in or on t...H01L 33/20 with a particular shape, e....H01L 33/38 with a particular shapeH01L 33/405 Reflective materials
