发明授权
- 专利标题: Yellow light emitting device with high luminance
- 专利标题(中): 黄色发光装置,亮度高
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申请号: US11711766申请日: 2007-02-28
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公开(公告)号: US07825578B2公开(公告)日: 2010-11-02
- 发明人: Suguru Takashima , Masato Aihara , Tomohisa Kishimoto , Hitomi Miki , Kenichi Aoyagi , Takeshi Kihara
- 申请人: Suguru Takashima , Masato Aihara , Tomohisa Kishimoto , Hitomi Miki , Kenichi Aoyagi , Takeshi Kihara
- 申请人地址: JP Anan-shi
- 专利权人: Nichia Corporation
- 当前专利权人: Nichia Corporation
- 当前专利权人地址: JP Anan-shi
- 代理机构: Birch, Stewart, Kolasch & Birch, LLP
- 优先权: JP2006-055014 20060301
- 主分类号: H01J1/62
- IPC分类号: H01J1/62 ; H01J63/04
摘要:
An object of the present invention is to provide a light emitting device which emits light of deep yellowish color with high luminance. The light emitting device of the present invention comprises a light emitting element having a peak emission wavelength shorter than 490 nm, a fluorescent material for wavelength conversion which absorbs light from the light emitting element and emits light of a wavelength longer than that of the light from the light emitting element, and a filter which cuts off a part of a mixed light produced by mixing the light of the light emitting element and the light of the fluorescent material, wherein the light transmitted through the filter has a chromaticity coordinate on the chromaticity diagram according to CIE 1931 plotted in a region defined by a first point (x=0.450, y=0.450), a second point (x=0.250, y=0.650), a third point (x=0.350, y=0.750) and a fourth point (x=0.250, y=0.750) and in the region defined by a closed curve consisting of the monochromatic locus and the purple boundary.
公开/授权文献
- US20070205711A1 Light emitting device 公开/授权日:2007-09-06