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公开(公告)号：US11667836B2
公开(公告)日：2023-06-06
申请号：US17657756
申请日：2022-04-03
Applicant: NICHIA CORPORATION
Inventor： Kenji Asai , Kazushige Fujio
IPC: C09K11/77 , H01L25/075 , H01L33/50 , H05B47/155 , H05B45/10
CPC classification number: C09K11/7734 , C09K11/7774 , C09K11/77342 , C09K11/77348 , H01L25/0753 , H01L33/502 , H01L33/507 , H05B45/10 , H05B47/155
Abstract: A light emitting device includes a first light source containing a first light emitting element, and a second light source containing a second light emitting element and a second fluorescent material, the first light source emits light in a region that is demarcated in a chromaticity diagram of the CIE 1931 color coordinate system by a first straight line connecting a first point having x,y of 0.280, 0.070 in the chromaticity coordinate and a second point having x,y of 0.280, 0.500 in the chromaticity coordinate, a second straight line connecting the second point and a third point having x,y of 0.013, 0.500 in the chromaticity coordinate, a purple boundary extending from the first point toward a direction in which x decreases in the chromaticity coordinate, and a spectrum locus extending from the third point toward a direction in which y decreases in the chromaticity coordinate, in a light emission spectrum, a light emission intensity ratio IPM/IPL of a light emission intensity IPM at a wavelength of 490 nm with respect to a light emission intensity IPL at a maximum light emission peak wavelength of the first light emitting element is in a range of 0.22 or more and 0.95 or less, the second light source emits light having a color deviation duv from a blackbody radiation locus in a range of −0.02 or more and 0.02 or less measured according to JIS Z8725 with a correlated color temperature in a range of 1,500 K or more and 8,000 K or less in a chromaticity diagram of the CIE 1931 color coordinate system, and the light emitting device emits mixed color light of light emitted from the first light source and light emitted from the second light source.
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公开(公告)号：US11605761B2
公开(公告)日：2023-03-14
申请号：US17028496
申请日：2020-09-22
Applicant: NICHIA CORPORATION
Inventor： Kazushige Fujio , Masaki Kondo
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.
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公开(公告)号：US10818827B2
公开(公告)日：2020-10-27
申请号：US16142586
申请日：2018-09-26
Applicant: NICHIA CORPORATION
Inventor： Kazushige Fujio , Masaki Kondo
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.
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公开(公告)号：US11329197B2
公开(公告)日：2022-05-10
申请号：US16833487
申请日：2020-03-27
Applicant: NICHIA CORPORATION
Inventor： Kenji Asai , Kazushige Fujio
IPC: H01L33/50 , H01L25/075 , H05B47/155 , H05B45/10
Abstract: A light emitting device includes a first light source containing a first light emitting element, and a second light source containing a second light emitting element and a second fluorescent material, the first light source emits light in a region that is demarcated in a chromaticity diagram of the CIE 1931 color coordinate system by a first straight line connecting a first point having x,y of 0.280,0.070 in the chromaticity coordinate and a second point having x,y of 0.280,0.500 in the chromaticity coordinate, a second straight line connecting the second point and a third point having x,y of 0.013,0.500 in the chromaticity coordinate, a purple boundary extending from the first point toward a direction in which x decreases in the chromaticity coordinate, and a spectrum locus extending from the third point toward a direction in which y decreases in the chromaticity coordinate, in a light emission spectrum, a light emission intensity ratio IPM/IPL of a light emission intensity IPM at a wavelength of 490 nm with respect to a light emission intensity IPL at a maximum light emission peak wavelength of the first light emitting element is in a range of 0.22 or more and 0.95 or less, the second light source emits light having a color deviation duv from a blackbody radiation locus in a range of −0.02 or more and 0.02 or less measured according to JIS Z8725 with a correlated color temperature in a range of 1,500 K or more and 8,000 K or less in a chromaticity diagram of the CIE 1931 color coordinate system, and the light emitting device emits mixed color light of light emitted from the first light source and light emitted from the second light source.
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公开(公告)号：US10952382B2
公开(公告)日：2021-03-23
申请号：US16572524
申请日：2019-09-16
Applicant: NICHIA CORPORATION
Inventor： Mika Amiya , Kazushige Fujio , Tomokazu Suzuki
Abstract: Provided is a light emitting device that includes a light emitting element having a light emission peak wavelength ranging from 380 nm to 490 nm, and a fluorescent material excited by light from the light emitting element and emitting light having at a light emission peak wavelength ranging from 580 nm or more to less than 680 nm. The light emitting device emits light having a ratio R/B of a photon flux density R to a photon flux density B ranging from 2.0 to 4.0 and a ratio R/FR of the photon flux density R to a photon flux density FR ranging from 0.7 to 13.0, the photon flux density R being in a wavelength range of 620 nm or more and less than 700 nm, the photon flux density B being in a wavelength range of 380 nm or more and 490 nm or less, and the photon flux density FR being in a wavelength range of 700 nm or more and 780 nm or less.
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Patent Agency Ranking
公开(公告)号：US10770628B2
公开(公告)日：2020-09-08
申请号：US16426918
申请日：2019-05-30
Applicant: NICHIA CORPORATION
Inventor： Makiko Iwasa , Kazushige Fujio
Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.
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公开(公告)号：US10455773B2
公开(公告)日：2019-10-29
申请号：US15634401
申请日：2017-06-27
Applicant: NICHIA CORPORATION
Inventor： Mika Amiya , Kazushige Fujio , Tomokazu Suzuki
Abstract: Provided is a light emitting device that includes a light emitting element having a light emission peak wavelength ranging from 380 nm to 490 nm, and a fluorescent material excited by light from the light emitting element and emitting light having at a light emission peak wavelength ranging from 580 nm or more to less than 680 nm. The light emitting device emits light having a ratio R/B of a photon flux density R to a photon flux density B ranging from 2.0 to 4.0 and a ratio R/FR of the photon flux density R to a photon flux density FR ranging from 0.7 to 13.0, the photon flux density R being in a wavelength range of 620 nm or more and less than 700 nm, the photon flux density B being in a wavelength range of 380 nm or more and 490 nm or less, and the photon flux density FR being in a wavelength range of 700 nm or more and 780 nm or less.
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公开(公告)号：US12163633B2
公开(公告)日：2024-12-10
申请号：US18576054
申请日：2022-02-22
Applicant: NICHIA CORPORATION
Inventor： Mika Matsumoto , Miyuki Kurata , Kazushige Fujio
Abstract: Provided is a light-emitting device, a lighting appliance, and a street light that emit light with minimal negative effects on the behavior of sea turtles and which makes irradiated objects easily visible to humans. The light-emitting device includes a light-emitting element having an emission peak wavelength within a range from 400 nm to 490 nm; and a first phosphor having an emission peak wavelength within a range from 570 nm to 680 nm, wherein the light-emitting device, lighting appliance, and street light emit light that has a correlated color temperature of 1950 K or less, an average color rendering index Ra of 40 or greater, a full width at half maximum of an emission spectrum indicating a maximum emission intensity in an emission spectrum of the light-emitting device of 110 nm or less, and a sea turtle light attraction index T derived from Equation (1) of 0.416 or less.
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公开(公告)号：US11990571B2
公开(公告)日：2024-05-21
申请号：US17929870
申请日：2022-09-06
Applicant: NICHIA CORPORATION
Inventor： Makiko Iwasa , Kazushige Fujio
CPC classification number: H01L33/504 , A61L2/084 , H01L33/507 , H01L33/56 , H01L33/60 , A61L2202/11 , H01L33/32 , H01L33/486 , H01L33/62
Abstract: A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.
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公开(公告)号：US11655963B2
公开(公告)日：2023-05-23
申请号：US17660723
申请日：2022-04-26
Applicant: NICHIA CORPORATION
Inventor： Mika Matsumoto , Kazushige Fujio
IPC: F21V9/30 , F21S8/08 , C09K11/77 , C09K11/61 , F21W131/103
CPC classification number: F21V9/30 , C09K11/617 , C09K11/7774 , C09K11/77347 , C09K11/77348 , F21S8/085 , F21W2131/103
Abstract: A light emitting device comprises a light emitting element having a light emission peak wavelength in a range of 400 nm or more and 490 nm or less and a first fluorescent material having a light emission peak wavelength in a range of 570 nm or more and 680 nm or less, and emits light having a correlated color temperature being 1,950 K or less, an average color rendering index Ra being 51 or more, a full width at half maximum of a light emission peak having a maximum light emission intensity in a light emission spectrum of the light emitting device being 110 nm or less, and a first glare index Ls1/L that is a ratio of a first effective radiance Ls1 to a luminance L being 0.493 or less, wherein Ls1 and L are as defined in the disclosure.
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