| 简介 |
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; M 1 - x �¢ 1 �¢ Eu x �¢ 1 a �¢ Si b �¢ AlO c �¢ N d (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) : 2.0 �¢ r ¼m ‰¤ D ‰¤ r + 1000 ¼m . |
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