Title:
LIGHT-EMITTING DEVICE, HEADLIGHT, AND VEHICLE EQUIPPED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2024/079960
Kind Code:
A1
Abstract:
Provided is a light-emitting device that can reduce glare and has excellent durability, a headlight, and a vehicle equipped with the same. The light-emitting device comprises: a light-emitting element having an emission peak wavelength in the range of 400- 490 nm; and a wavelength conversion member that has a first phosphor having an emission peak wavelength in the range of 480 nm to less than 580 nm, and a second phosphor having an emission peak wavelength in the range of 580-680 nm and having a composition different from that of the first phosphor. The light emitting device emits light having a first luminance ratio Ls/L of 0.9 or less, said first luminance ratio Ls/L being a ratio of the first effective radiation luminance Ls of the light emitted from the light-emitting device in consideration of the spectral sensitivity of the human S-cone and the human photopic standard luminous efficiency curve defined by CIE, with respect to the luminance L of the light emitted from the light-emitting device in consideration of the human photopic standard luminous efficiency curve. The first phosphor includes a rare earth aluminate phosphor having a composition represented by formula (1A).
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Inventors:
HINO HARUKA (JP)
SANO YUKIKO (JP)
SANO YUKIKO (JP)
Application Number:
PCT/JP2023/026930
Publication Date:
April 18, 2024
Filing Date:
July 24, 2023
Export Citation:
Assignee:
NICHIA CORP (JP)
International Classes:
H01L33/50; C09K11/08; F21S41/14; F21W102/00; F21Y115/00
Attorney, Agent or Firm:
ICHIZAWA, KAWADA & ASSOCIATES (JP)
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