Title:
LIGHT-EMITTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/171254
Kind Code:
A1
Abstract:
Provided is a light-emitting device that emits amber light and that has good temperature characteristics. This light-emitting device comprises: a light-emitting element having an emission peak wavelength between 380 nm and 470 nm; and a wavelength conversion member including a fluorescent body that emits light by absorbing at least a portion of the light from the light-emitting element. The fluorescent body includes: a first fluorescent body that has an emission peak wavelength between 535 nm and 560 nm and a half-value width of 100 nm to 120 nm and that contains a nitride comprising La, Ce, and Si; and a second fluorescent body that has an emission peak wavelength between 605 nm and 620 nm and a half-value width of 70 nm to 80 nm and that contains a nitride comprising Eu, Si, Al and at least one of Ca and Sr. The light-emitting device emits light that is in the region defined by joining (0.545, 0.425), (0.560, 0.440), (0.609. 0.390), and (0.597, 0.390) in the xy chromaticity coordinate system of a CIE1931 chromaticity diagram.
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Inventors:
YOSHIDA SHIGEKI (JP)
SUZUKI SHIGEYUKI (JP)
WATANABE HIROYUKI (JP)
SUZUKI SHIGEYUKI (JP)
WATANABE HIROYUKI (JP)
Application Number:
PCT/JP2023/004950
Publication Date:
September 14, 2023
Filing Date:
February 14, 2023
Export Citation:
Assignee:
NICHIA CORP (JP)
International Classes:
H01L33/50
Domestic Patent References:
| WO2009051137A1 | 2009-04-23 |
Foreign References:
| JP2021057480A | 2021-04-08 | |||
| JP2012142293A | 2012-07-26 | |||
| JP2011044738A | 2011-03-03 |
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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