Invention Grant
- Patent Title: Yellow light emitting device with high luminance
- Patent Title (中): 黄色发光装置,亮度高
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Application No.: US11711766Application Date: 2007-02-28
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Publication No.: US07825578B2Publication Date: 2010-11-02
- Inventor: Suguru Takashima , Masato Aihara , Tomohisa Kishimoto , Hitomi Miki , Kenichi Aoyagi , Takeshi Kihara
- Applicant: Suguru Takashima , Masato Aihara , Tomohisa Kishimoto , Hitomi Miki , Kenichi Aoyagi , Takeshi Kihara
- Applicant Address: JP Anan-shi
- Assignee: Nichia Corporation
- Current Assignee: Nichia Corporation
- Current Assignee Address: JP Anan-shi
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2006-055014 20060301
- Main IPC: H01J1/62
- IPC: H01J1/62 ; H01J63/04

Abstract:
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.
Public/Granted literature
- US20070205711A1 Light emitting device Public/Granted day:2007-09-06
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