Light emitting device
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United States of America Patent
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May 7, 2013
Grant Date -
Mar 8, 2012
app pub date -
Feb 24, 2011
filing date -
Sep 7, 2010
priority date (Note) -
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Abstract
A light emitting device includes a board and a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm. A red fluorescent layer is formed on the element and includes a red phosphor (M1−x1Eux1)aSibAlOcNd having a semicircular shape with a radius r, where M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Aluminum, rare-earth elements, and IVB group elements. An intermediate layer is formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a radius D; and a green fluorescent layer is formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the radius r and the radius D is 2.0r(μm)≦D≦(r+1000)(μm).
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