公开(公告)号：US20180006197A1

公开(公告)日：2018-01-04

申请号：US15635203

申请日：2017-06-28

Applicant: NICHIA CORPORATION

Inventor： Taiki YUASA ,  Masaki HAYASHI

IPC: H01L33/50 ,  H01L33/32 ,  H01L27/15 ,  H01L33/60 ,  H01L33/52

CPC classification number: H01L33/504 ,  H01L27/15 ,  H01L33/32 ,  H01L33/507 ,  H01L33/52 ,  H01L33/60

Abstract: A light emitting device includes at least one light emitting element to emit a first light having a first peak emission wavelength in a range of 420 nm to 480 nm and at least one fluorescent material to convert the first light to a second light having a second fluorescent peak wavelength in a range of 610 nm to 750 nm. The second light has chromaticity existing in an enclosed area in a CIE 1931 chromaticity diagram in which chromaticity is defined by x and y coordinates. The enclosed area is enclosed with a first straight line, a second straight line, a third straight line, and a curved line.

公开(公告)号：US20180351053A1

公开(公告)日：2018-12-06

申请号：US15993014

申请日：2018-05-30

Applicant: NICHIA CORPORATION

Inventor： Taiki YUASA ,  Daisuke IWAKURA

IPC: H01L33/50 ,  H01L33/48 ,  H01L33/60

CPC classification number: H01L33/44 ,  H01L33/46 ,  H01L33/504 ,  H01L33/505

Abstract: A light-emitting device includes: a light-transmissive member having a first surface, a second surface opposite the first surface, and a third surface contiguous with the first surface and the second surface; a phosphor layer disposed opposite to the second surface of the light-transmissive member; a cover layer disposed on a lateral surface of the phosphor layer and the third surface of the light-transmissive member; a light-emitting element disposed opposite to the phosphor layer; and a light-reflective member that covers at least a portion of the cover layer.

公开(公告)号：US20180182941A1

公开(公告)日：2018-06-28

申请号：US15831392

申请日：2017-12-05

Applicant: NICHIA CORPORATION

Inventor： Taiki YUASA ,  Takeshi Kususe

IPC: H01L33/60 ,  H01L33/50

CPC classification number: H01L33/60 ,  H01L33/46 ,  H01L33/486 ,  H01L33/502 ,  H01L33/504 ,  H01L33/56 ,  H01L33/62 ,  H01L2224/16245 ,  H01L2933/0083

Abstract: A light emitting device includes a light emitting element having a light emitting surface from which the light emitting element is configured to emit a first light having a first peak emission wavelength in a wavelength range of 380 nm or longer and 430 nm or shorter. A light transform layer is disposed on the light emitting surface of the light emitting element to transform the first light to a second light having a second peak wavelength longer than the first peak wavelength. A reflecting film is provided on the light transform layer to reflect the first light and to transmit the second light. The reflecting film has a reflectivity of 40% or more in a reflection spectrum of the reflecting film with respect to a light having a wavelength of 380 nm or longer and 430 nm or shorter and an angle of incidence from 0° to 85°.

公开(公告)号：US20200119238A1

公开(公告)日：2020-04-16

申请号：US16711431

申请日：2019-12-12

Applicant: NICHIA CORPORATION

Inventor： Taiki YUASA

IPC: H01L33/50 ,  H01L33/48 ,  H01L33/62 ,  H01L33/60 ,  H01L33/56 ,  H01L33/00 ,  H01L33/44

Abstract: A light emitting device according to one embodiment of the present disclosure includes a light emitting element, a fluorescent material layer, a reflective film, a light-transmissive member, and an absorbing layer. The light emitting element emits first light. The fluorescent material layer is disposed on the light emitting element. The fluorescent material layer is excited by the first light to emit second light being longer in wavelength than the first light. The reflective film is disposed on the fluorescent material layer to reflect part of the first light and transmit the second light. The light-transmissive member is disposed on the reflective film. The absorbing layer is disposed on the light-transmissive member to absorb part of the first light. The light emitting element is identical in area to or smaller in area than the fluorescent material layer in a plan view.

公开(公告)号：US20190237635A1

公开(公告)日：2019-08-01

申请号：US16261564

申请日：2019-01-30

Applicant: NICHIA CORPORATION

Inventor： Taiki YUASA

IPC: H01L33/50 ,  H01L33/60 ,  H01L33/56 ,  H01L33/32 ,  H01L27/15 ,  C09K11/77 ,  C09K11/08

Abstract: A light emitting device includes at least one first light emitting element to emit a first light and at least one fluorescent material to convert the first light to a second light. The second light has chromaticity existing in an enclosed area in a CIE 1931 chromaticity diagram. The CIE 1931 chromaticity diagram has a curved boundary indicating a spectral locus. The enclosed area is enclosed with a first straight line, a second straight line, a third straight line, and a curved line. The first straight line connects a first point at which x is equal to 0.643 and y is equal to 0.334 and a second point at which x is equal to 0.643 and y is equal to 0.334. The second straight line connects the second point and a third point at which x is equal to 0.576 and y is equal to 0.291. The third straight line connects the third point and a fourth point at which x is equal to 0.737 and y is equal to 263. The curved line connects the fourth point and the first point. The curved line is a part of the curved boundary.

公开(公告)号：US20210249571A1

公开(公告)日：2021-08-12

申请号：US17302248

申请日：2021-04-28

Applicant: NICHIA CORPORATION

Inventor： Taiki YUASA ,  Daisuke IWAKURA

IPC: H01L33/50 ,  H01L33/48 ,  H01L33/60 ,  H01L33/44 ,  H01L33/46

Abstract: A light-emitting device includes: a set of layers including (i) a light-transmissive member having a top surface, a bottom surface, and a lateral surface contiguous with the top surface and the bottom surface, (ii) a first phosphor layer disposed below the bottom surface, and (iii) a dielectric multilayer film between the light-transmissive member and the first phosphor layer; a cover layer disposed on a lateral surface of the set of layers; and a light-emitting element disposed below the first phosphor layer. The light-emitting element emits blue light. The first phosphor layer absorbs at least a portion of the blue light and emits yellow-red to red light. The cover layer is either: a second phosphor layer that absorbs at least a portion of the blue light emitted by the light-emitting element and emits yellow-red to red light, or a pigment layer that presents yellow-red to red light.

公开(公告)号：US20200335671A1

公开(公告)日：2020-10-22

申请号：US16919034

申请日：2020-07-01

Applicant: NICHIA CORPORATION

Inventor： Taiki YUASA

IPC: H01L33/50 ,  H01L33/60 ,  C09K11/08 ,  H01L33/32 ,  H01L27/15 ,  C09K11/77 ,  H01L33/56

Abstract: A light emitting device includes at least one first light emitting element to emit a first light having a first peak emission wavelength in a range of 370 nm or greater and 415 nm or less, and at least one fluorescent material to convert the first light to a second light having a second peak wavelength in a range of 550 nm or greater and to 780 nm or less. In an emission spectrum of the light emitting device, a ratio of an intensity of the first peak emission wavelength to a maximum intensity of the second peak emission wavelength is in a range of 0.005 to 0.20.

公开(公告)号：US20190035987A1

公开(公告)日：2019-01-31

申请号：US16044433

申请日：2018-07-24

Applicant: NICHIA CORPORATION

Inventor： Taiki YUASA

IPC: H01L33/50 ,  H01L33/60 ,  H01L33/62 ,  H01L33/48

Abstract: A light emitting device includes: a light emitting element emitting first light; a fluorescent material layer disposed on the light emitting element and excited by the first light to emit second light being longer in wavelength than the first light; a reflective film disposed on the fluorescent material layer to reflect the first light and transmit the second light; a light-transmissive member disposed on the reflective film; and an absorbing layer disposed on the light-transmissive member to absorb the first light.