Invention Grant
- Patent Title: Light emitting device
- Patent Title (中): 发光装置
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Application No.: US13034137Application Date: 2011-02-24
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Publication No.: US08436527B2Publication Date: 2013-05-07
- Inventor: Iwao Mitsuishi , Kunio Ishida , Yumi Fukuda , Aoi Okada , Naotoshi Matsuda , Keiko Albessard , Shinya Nunoue
- Applicant: Iwao Mitsuishi , Kunio Ishida , Yumi Fukuda , Aoi Okada , Naotoshi Matsuda , Keiko Albessard , Shinya Nunoue
- Applicant Address: JP Tokyo
- Assignee: Kabushiki Kaisha Toshiba
- Current Assignee: Kabushiki Kaisha Toshiba
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2010-199983 20100907
- Main IPC: H01L33/50
- IPC: H01L33/50 ; H01L33/54 ; H01L33/56
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).
Public/Granted literature
- US20120056527A1 LIGHT EMITTING DEVICE Public/Granted day:2012-03-08
Information query
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