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LIGHT EMITTING DEVICE

2025-06-18 05:284460下载
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A light emitting device according to one embodiment includes a board; a light emitting element mounted on the board, emitting light having a wavelength of 250 nm to 500 nm; a red fluorescent layer formed on the element, including a red phosphor expressed by equation (1), having a semicircular shape with a diameter r; [in-line-formulae](M1−x1Eux1)aSibAlOcNd  (1)[/in-line-formulae] (In the equation (1), M is an element that is selected from IA group elements, IIA group elements, IIIA group elements, IIIB group elements except Al (Aliminum), rare-earth elements, and IVB group elements), an intermediate layer formed on the red fluorescent layer, being made of transparent resin, having a semicircular shape with a diameter D; and a green fluorescent layer formed on the intermediate layer, including a green phosphor, having a semicircular shape. A relationship between the diameter r and the diameter D satisfies equation (2) : [in-line-formulae]2.0r (μm)≧D(r+1000) (μm).  (2)[/in-line-formulae]


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