Invention Grant
- Patent Title: Light-emitting device
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Application No.: US13158948Application Date: 2011-06-13
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Publication No.: US08237178B2Publication Date: 2012-08-07
- Inventor: Hideo Nagai
- Applicant: Hideo Nagai
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Hamre, Schumann, Mueller & Larson, P.C.
- Priority: JP2007-203478 20070803; JP2007-208216 20070809
- Main IPC: H01L33/00
- IPC: H01L33/00

Abstract:
A light-emitting device includes a base and a light-emitting element that is disposed on the base. The light-emitting element is made up of a plurality of semiconductor layers including a light-emitting layer, and at the same time, is covered with a wavelength converting portion that includes a wavelength converting material. The light-emitting layer emits primary light, and the wavelength converting material absorbs part of the primary light and emits secondary light. The luminance of the primary light emitted from the edge portion of the light extraction surface of the light-emitting device is higher than the luminance of the primary light emitted from the inner region located inside the edge portion, and the ratio of the primary light and the secondary light that are emitted from a light extraction surface of the wavelength converting portion is substantially uniform across the light extraction surface of the wavelength converting portion. Thereby, a light color difference across the light extraction surface of the wavelength converting portion that covers the light-emitting element can be reduced further, and it is possible to irradiate an irradiation surface with light of uniform color.
Public/Granted literature
- US20110241033A1 LIGHT-EMITTING DEVICE Public/Granted day:2011-10-06
Information query
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