Abstract
PROBLEM TO BE SOLVED: To remarkably improve, in an LED, the take-out efficiency of light from a light emitting element into the air by reducing reflection light on the surface as much as possible. SOLUTION: The LED 11 is sealed with a transparent epoxy resin 2 having a convex type semi-spherical microstructure 6 so as to form the shape of a shell and, further, a fluoride magnesium layer 7 is formed on the transparent epoxy resin 2. The refractive index of the fluoride magnesium 7 is about 1.3 and is smaller than that of the transparent epoxy resin 2 or about 1.5. Therefore, the total reflection and the reflectivity on the surface of the transparent sealing epoxy resin 2 of the light emitting element 3 are reduced largely by the multiplier effect of the convex type semi-spherical microstructure 6 and the low refractive index fluoride magnesium 7 which covers the microstructure 6. Further, even when light is radiated from the low refractive index fluoride magnesium 7 into the air, the rate of total reflection is reduced, and the reflectivity is also lowered compared with a case when the light is directly radiated into the air from the transparent epoxy resin 2. COPYRIGHT: (C)2004,JPO&NCIPI
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