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公开(公告)号：US10378701B2
公开(公告)日：2019-08-13
申请号：US15761944
申请日：2016-10-26
Inventor： Takeshi Abe , Shozo Oshio , Hiroshi Asano , Yosuke Honda
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.
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Patent Agency Ranking
公开(公告)号：US12140305B2
公开(公告)日：2024-11-12
申请号：US18598177
申请日：2024-03-07
Inventor： Mitsuru Nitta , Shozo Oshio , Takeshi Abe
IPC: F21V9/30 , A61B5/00 , A61N5/06 , A61N5/067 , A61B1/04 , A61B1/06 , F21W131/20 , F21Y115/30
Abstract: A light-emitting device includes: a light source that radiates primary light; and a first phosphor that absorbs the primary light and converts the primary light into first wavelength-converted light having a longer wavelength than the primary light, the first wavelength-converted light includes fluorescence based on electron energy transition of Cr3+, and a fluorescence spectrum of the first wavelength-converted light has a maximum fluorescence intensity value in region of a wavelength exceeding 710 nm.
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公开(公告)号：US11050005B2
公开(公告)日：2021-06-29
申请号：US16072532
申请日：2017-03-06
Inventor： Takeshi Abe , Shozo Oshio
Abstract: A phosphor composed by containing Ce3+ as a light emission center in a matrix garnet compound having a garnet structure. The matrix garnet compound is a solid solution composed of two or more end members, and the end members include Lu2CaMg2(SiO4)3 as a first end member. It is preferable that the matrix garnet compound is a compound containing Al. A light emitting device uses the phosphor 2 and includes a solid-state light emitting device 117. The phosphor 2 is excited by light radiated by the solid-state light emitting device 117.
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公开(公告)号：US10669479B2
公开(公告)日：2020-06-02
申请号：US16486828
申请日：2017-10-18
Inventor： Shozo Oshio , Takeshi Abe
Abstract: A light-emitting device 1 includes: a solid-state light-emitting element 10 that radiates a laser beam L; and a wavelength converter 50 including a plurality of types of phosphors which receive the laser beam L and radiate light. The phosphors 50 included in the wavelength converter are substantially composed of a Ce3+-activated phosphor. Then, output light of the light-emitting device 1 has a light component across a wavelength range of at least 420 nm or more and less than 700 nm. The light-emitting device 1 is capable of radiating light with high color rendering properties over a wide wavelength range.
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公开(公告)号：US10651348B2
公开(公告)日：2020-05-12
申请号：US16427243
申请日：2019-05-30
Inventor： Youshin Lee , Shozo Oshio , Tatsuya Okuno , Takeshi Abe , Masahiro Nakamura
IPC: H01J1/62 , H01L33/50 , C09K11/08 , F21S2/00 , G02B5/20 , H01S5/022 , F21V9/30 , H01L33/16 , H01L33/58
Abstract: A light emitting device 1 includes: a substrate 30; and a phosphor layer 40 composed in such a manner that a large number of phosphor particles 60 are adhered onto a flat surface 32 of the substrate 30. At least one of the phosphor particles 60 is a polyhedral phosphor particle 65 that is monodispersed, is derived from a crystal structure of garnet and has facets, and a median particle size D50 of the polyhedral phosphor particle 65 is 30 μm or more and a maximum thickness of the phosphor layer 40 or less. It is preferable that at least one of the phosphor particles 60 adhered onto the flat surface 32 of the substrate 30 is the polyhedral phosphor particle 65 that is monodispersed, is derived from the crystal structure of the garnet, and has the facets.
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公开(公告)号：US10563842B2
公开(公告)日：2020-02-18
申请号：US15779348
申请日：2016-11-21
Inventor： Takeshi Abe , Shozo Oshio
Abstract: A light-emitting device includes a radiation source that radiates laser light as first primary light, and a first wavelength converter, and emits output light. The first wavelength converter has an incidence face on which the first primary light is incident, and an emission face through which the output light emits. A normal to the incidence face and a normal to the emission face are mutually different. A first phosphor included in the first wavelength converter is a single crystal phosphor.
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