Invention Grant
- Patent Title: Light-emitting device
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Application No.: US17028496Application Date: 2020-09-22
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Publication No.: US11605761B2Publication Date: 2023-03-14
- Inventor: Kazushige Fujio , Masaki Kondo
- Applicant: NICHIA CORPORATION
- Applicant Address: JP Anan
- Assignee: NICHIA CORPORATION
- Current Assignee: NICHIA CORPORATION
- Current Assignee Address: JP Anan
- Agency: Hunton Andrews Kurth LLP
- Priority: JPJP2017-188523 20170928
- Main IPC: H01L33/48
- IPC: H01L33/48 ; H01L33/50 ; C09K11/77 ; H01L33/32 ; H01L33/56 ; H01L33/62

Abstract:
A light-emitting device is provided. The light-emitting device includes a light-emitting element having a peak light-emitting wavelength in the range of 440 nm to 470 nm, and a fluorescent member. The fluorescent member includes a first fluorescent material having a peak light-emitting wavelength in the range of 480 nm to less than 520 nm, a second fluorescent material having a peak light-emitting wavelength in the range of 520 nm to less than 600 nm, and a third fluorescent material having a peak light-emitting wavelength in the range of 600 nm to 670 nm. The light-emitting device has a ratio of an effective radiant intensity for melatonin secretion suppression to an effective radiant intensity for blue-light retinal damage of 1.53 to 1.70 when the light-emitting device emits light with a correlated color temperature of 2700 K to less than 3500 K; 1.40 to 1.70 when the light-emitting device emits light with a correlated color temperature of 3500 K to less than 4500 K; 1.40 to 1.70 when the light-emitting device emits light with a correlated color temperature of 4500 K to less than 5700 K; and 1.35 to 1.65 when the light-emitting device emits light with a correlated color temperature of 5700 K to 7200 K.
Public/Granted literature
- US20210013383A1 LIGHT-EMITTING DEVICE Public/Granted day:2021-01-14
Information query
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