LIGHT EMITTING DEVICE, SURFACE LIGHT SOURCE, LIQUID CRYSTAL DISPLAY DEVICE, AND METHOD FOR MANUFACTURING LIGHT EMITTING DEVICE
First Claim
1. A light emitting device, comprising:
- a substrate having a main surface;
an inner portion provided on said main surface and containing a semiconductor light emitting element that emits primary light and a fluorescent particle that absorbs a part of the primary light and emits secondary light; and
an outer portion having a refractive index n and covering said inner portion, whereinsaid outer portion has an outer circumferential surface that forms a boundary between the outer portion and the atmosphere, andwhen a minimum circumference that includes overall said inner portion and is concentric with said outer circumferential surface has a radius r in a cut surface where at least a part of said outer circumferential surface takes a shape of an arc having a radius R, a relationship of R>
r·
n is satisfied.
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Accused Products
Abstract
A light emitting device includes: a substrate having a main surface; a phosphor layer provided on the main surface and containing an LED element that emits primary light and a fluorescent particle that absorbs a part of the primary light and emits secondary light; and a transparent resin layer having a refractive index n and covering the phosphor layer. The transparent resin layer has an outer circumferential surface that forms a boundary between the transparent resin layer and the atmosphere. When a minimum circumference that includes the overall phosphor layer and is concentric with the outer circumferential surface has a radius r in a cut surface where at least a part of the outer circumferential surface takes a shape of an arc having a radius R, a relationship of R>r·n is satisfied. With such configuration, the light extraction efficiency is enhanced.
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Citations
18 Claims
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1. A light emitting device, comprising:
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a substrate having a main surface; an inner portion provided on said main surface and containing a semiconductor light emitting element that emits primary light and a fluorescent particle that absorbs a part of the primary light and emits secondary light; and an outer portion having a refractive index n and covering said inner portion, wherein said outer portion has an outer circumferential surface that forms a boundary between the outer portion and the atmosphere, and when a minimum circumference that includes overall said inner portion and is concentric with said outer circumferential surface has a radius r in a cut surface where at least a part of said outer circumferential surface takes a shape of an arc having a radius R, a relationship of R>
r·
n is satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for manufacturing a light emitting device, comprising the steps of:
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die-bonding a semiconductor light emitting element onto a substrate; providing a blocking component on said substrate to surround said semiconductor light emitting element; forming a resin including a fluorescent particle inside said blocking component and covering said semiconductor light emitting element with said resin including the fluorescent particle; and covering said resin including the fluorescent particle with a transparent resin. - View Dependent Claims (17, 18)
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Specification