Invention Grant
- Patent Title: Light emitting device
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Application No.: US16457956Application Date: 2019-06-29
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Publication No.: US10533713B2Publication Date: 2020-01-14
- Inventor: Takeshi Abe , Shozo Oshio , Hiroshi Asano , Yosuke Honda
- Applicant: Panasonic Intellectual Property Management Co., Ltd.
- Applicant Address: JP Osaka
- Assignee: Panasonic Intellectual Property Management Co., Ltd.
- Current Assignee: Panasonic Intellectual Property Management Co., Ltd.
- Current Assignee Address: JP Osaka
- Agency: Renner, Otto, Boisselle & Sklar, LLP
- Priority: JP2015-211962 20151028
- Main IPC: F21K9/64
- IPC: F21K9/64 ; F21V9/32 ; F21V9/38 ; F21V9/30 ; H01S5/00 ; F21Y115/30

Abstract:
A light emitting device includes a first wavelength converter that contains a first phosphor that absorbs at least part of primary light radiated by a radiation source and converts the primary light absorbed into secondary light, and a second wavelength converter that contains a second phosphor that absorbs at least part of the secondary light and converts the secondary light absorbed into tertiary light. The lifetime of fluorescence emitted from the second phosphor is longer than the lifetime of fluorescence emitted from the first phosphor, and the light density of the secondary light, with which the second wavelength converter is irradiated, is lower than the light density of the primary light, with which the first wavelength converter is irradiated.
Public/Granted literature
- US20190323664A1 LIGHT EMITTING DEVICE Public/Granted day:2019-10-24
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