WO2022176782A1 - 発光装置及びそれを用いた電子機器 - Google Patents

発光装置及びそれを用いた電子機器 Download PDF

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WO2022176782A1
WO2022176782A1 PCT/JP2022/005458 JP2022005458W WO2022176782A1 WO 2022176782 A1 WO2022176782 A1 WO 2022176782A1 JP 2022005458 W JP2022005458 W JP 2022005458W WO 2022176782 A1 WO2022176782 A1 WO 2022176782A1
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Prior art keywords
light
wavelength
phosphor
emitting device
component
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PCT/JP2022/005458
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English (en)
French (fr)
Japanese (ja)
Inventor
祥三 大塩
充 新田
亮祐 鴫谷
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to US18/276,022 priority Critical patent/US20240304764A1/en
Priority to JP2023500807A priority patent/JP7526966B2/ja
Priority to EP22756102.4A priority patent/EP4296333A4/en
Priority to CN202280016269.1A priority patent/CN116868354A/zh
Publication of WO2022176782A1 publication Critical patent/WO2022176782A1/ja
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7728—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing europium
    • C09K11/77348—Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7774—Aluminates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/77742—Silicates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7776—Vanadates; Chromates; Molybdates; Tungstates
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H10H20/8512—Wavelength conversion materials
    • H10H20/8513—Wavelength conversion materials having two or more wavelength conversion materials

Definitions

  • the present invention relates to a light-emitting device and electronic equipment using the same.
  • Patent Document 1 discloses a light-emitting element for industrial equipment that is used as a substitute for halogen lamps and the like.
  • the light emitting element includes an LED element that emits excitation light having a single peak wavelength of 380 to 500 nm, a phosphor that emits fluorescence with a longer wavelength than the excitation light when the excitation light is incident, A light extraction surface is provided for emitting emitted light in which excitation light and fluorescent light are superimposed.
  • the emitted light emits light over a range of at least the peak wavelength of the excitation light and 1050 nm or less, and exhibits an emission intensity equal to or higher than the emission intensity at 1050 nm in at least the range from the peak wavelength of the excitation light to 1050 nm.
  • the wavelength components required for inspection etc. differ depending on the inspection object and purpose, and the minimum required wavelength is limited.
  • the output light of the conventional light emitting device has a broadband spectral distribution, there are many unnecessary wavelength components, and there is a problem that the light components of the output light are not effectively utilized.
  • the output light has a low light intensity at a required wavelength, it has been difficult to reduce the size of the light emitting device, increase the output, and increase the efficiency.
  • An object of the present invention is to provide a light-emitting device that is advantageous in increasing the output of visible light components and near-infrared light components of specific wavelengths, and an electronic device using the light-emitting device.
  • a light emitting device is a light emitting device that includes a solid state light emitting element and a phosphor and emits output light.
  • the spectral distribution of the output light has a first light component and a second light component derived from fluorescence emitted by the phosphor, and a first light component and a second light component between the first light component and the second light component. has a local minimum.
  • the first light component is a fluorescence component having an intensity maximum within the wavelength range of 560 nm or more and less than 700 nm.
  • the second light component is a fluorescence component having an intensity maximum within the wavelength range of 700 nm or more and less than 2500 nm.
  • the intensity maximum of the second light component is greater than the intensity maximum of the first light component.
  • the first minimum is less than 50% of the intensity maximum of the second light component.
  • An electronic device includes the light emitting device described above.
  • FIG. 1 is a graph showing an example of the spectral distribution of output light emitted by the light emitting device of this embodiment.
  • FIG. 2 is a schematic diagram showing an example of the configuration of the light emitting device according to this embodiment.
  • FIG. 3 is a schematic diagram showing another example of the configuration of the light emitting device according to this embodiment.
  • FIG. 4 is a schematic diagram showing another example of the configuration of the light emitting device according to this embodiment.
  • FIG. 5 is a schematic diagram showing another example of the configuration of the light emitting device according to this embodiment.
  • FIG. 6 is a schematic diagram showing an example of the configuration of the electronic device according to this embodiment.
  • FIG. 7 is a schematic diagram showing another example of the configuration of the electronic device according to this embodiment.
  • FIG. 8 is a graph showing the spectral distribution of output light emitted by the light emitting devices of Examples 2-4.
  • FIG. 9 is a graph showing the spectral distribution of output light emitted by the light emitting devices of Examples 5-8.
  • the light-emitting device of this embodiment is a light-emitting device that emits output light 4 by combining at least a solid-state light-emitting element 3 and phosphors (first phosphor 1 and second phosphor 2). Then, the light emitting device emits output light 4 having a spectral distribution as shown in FIG. 1, for example.
  • the spectral distribution of the output light 4 emitted by the light emitting device of this embodiment has at least a first light component 5 and a second light component 6 derived from the fluorescence of the phosphor. Furthermore, the spectral distribution of the output light 4 has a first minimum 8 or valley between the first light component 5 and the second light component 6 . As is clear from FIG. 1, the first light component 5 and the second light component 6 are light components with different color tones.
  • the first light component 5 is a fluorescence component (visible light component) having a maximum intensity within a wavelength range of 380 nm or more and less than 700 nm, preferably a wavelength of 450 nm or more and less than 700 nm, more preferably a wavelength of 500 nm or more and less than 660 nm. be.
  • the second light component 6 is a fluorescence component (near-infrared light component) having a maximum intensity within a wavelength range of 700 nm or more and less than 2500 nm, preferably a wavelength of 750 nm or more and less than 1800 nm.
  • the wavelength at which the first light component has the maximum intensity is preferably 560 nm or longer, more preferably 575 nm or longer, and even more preferably 590 nm or longer.
  • the intensity maximum value of the second light component 6 is preferably greater than the intensity maximum value of the first light component 5 .
  • the first local minimum 8 is preferably less than 50%, more preferably less than 30%, of the intensity maximum of the second light component 6 .
  • the wavelength range of the output light 4, that is, the longest wavelength of the wavelength range related to the second light component 6 can be 800 nm, 900 nm, 1000 nm, 1200 nm or 1500 nm.
  • this light-emitting device is suitable for applications in which the light component used for the main purpose is the near-infrared light and the light component used for the auxiliary purpose is the visible light. Furthermore, the light-emitting device can easily design lighting with high electro-optical conversion efficiency and light usage efficiency.
  • the light-emitting device uses a phosphor, it is relatively easy to control the spectral distribution. Furthermore, at least the light component in the near-infrared wavelength range does not have an extremely narrow band like the infrared rays emitted by an infrared LED, nor does it have an ultra-wide band like a conventional LED light source, and has a moderate bandwidth. become what you have. Therefore, this light-emitting device is advantageous in obtaining near-infrared light having just the right bandwidth required for inspection equipment.
  • the photodetection sensitivity of a quantum photodetector decreases as the wavelength increases from around 500 nm. Therefore, by using the output light 4 in an inspection device and a monitoring device that combine a light-emitting device and the photodetector, detection levels in the visible region and the near-infrared region can be made uniform. That is, the detection levels in the visible region and the near-infrared region are determined by the product of the sensitivity of the photodetector and the output light intensity of the light emitting device. Therefore, in the wavelength range exceeding 500 nm, the above detection level can be uniformed by making the spectral distribution such that the maximum intensity value of the second light component 6 is larger than the maximum intensity value of the first light component 5. becomes.
  • the spectral distribution of the second light component 6, that is, the spectral distribution on the longer wavelength side than the wavelength of the first minimum value 8 is unimodal when the spectral intensity for each wavelength of 10 nm is displayed as a histogram.
  • the term “unimodal” refers to a distribution state in which the histogram has only one peak.
  • Fig. 1 also displays the relevant wavelength range data as a histogram.
  • the wavelength difference between the wavelength on the longer wavelength side and the wavelength on the lower wavelength side at which the intensity is 50% of the maximum intensity is preferably 50 nm or more and less than 200 nm, and more preferably 50 nm or more and 150 nm. It is more preferably less than.
  • the spectral distribution of the first light component 5 is preferably unimodal when the spectral intensity for each wavelength of 10 nm is displayed as a histogram.
  • the wavelength difference between the wavelength on the long wavelength side and the wavelength on the low wavelength side at which the intensity is 60% of the maximum intensity is preferably 50 nm or more and less than 200 nm, and is 50 nm. More preferably, the thickness is equal to or greater than 150 nm and less than 150 nm.
  • both the first light component 5 and the second light component 6 have a single peak type and a narrow spectral width as described above.
  • both the visible light component and the near-infrared light component forming the output light 4 are concentrated in a specific wavelength range.
  • the light-emitting device of the present embodiment can not only view an object to be inspected with compound eyes of visible light and near-infrared light, but also emit visible light and near-infrared light suitable for the object to be inspected. can do. Therefore, by using the light emitting device, it is possible to non-destructively detect a foreign object that is difficult to identify with only near-infrared rays.
  • the light-emitting device is advantageous for miniaturization, high sensitivity, and high efficiency of the foreign matter inspection device and the light source used therein, and can easily meet customer demands.
  • the spectral distribution of the output light 4 may further have a third light component 7 derived from the light (primary light 3B) emitted by the solid state light emitting device 3.
  • the third light component 7 can be a light component within the wavelength range of ultraviolet light or visible light.
  • the third light component 7 can be a light component having a maximum intensity within a wavelength range of 350 nm or more and less than 660 nm.
  • the third light component 7 can be a visible light component having a maximum intensity within a wavelength range of 405 nm or more and less than 600 nm, preferably 435 nm or more and less than 540 nm, particularly preferably 435 nm or more and less than 480 nm.
  • the spectral distribution of the output light 4 will have a second minimum 9 between the first light component 5 and the third light component 7 . Therefore, the spectral distribution between the first minimum value 8 and the second minimum value 9 is unimodal when the spectral intensity is expressed by a histogram for each 10 nm.
  • the third light component 7 has a maximum intensity within the wavelength range of 440 nm or more and less than 470 nm.
  • blue LEDs blue LEDs
  • blue LDs blue laser diodes
  • the spectral distribution of the output light 4 preferably has the first minimum value 8 within the wavelength range of 650 nm or more and less than 800 nm, and more preferably has the first minimum value 8 within the wavelength range of 700 nm ⁇ 50 nm.
  • the first minimum value 8 is preferably less than 50% of the maximum intensity in the spectral distribution within the wavelength range of 380 nm or more and 2500 nm or less, and the maximum intensity in the spectral distribution within the wavelength range of 380 nm or more and 960 nm or less. is more preferably less than 50% of the This reduces the interference between the first light component 5 mainly composed of visible light components and the second light component 6 having near-infrared light components.
  • the visible light and the near-infrared light have a spectral distribution separated to some extent around the wavelength of 700 nm.
  • the light-emitting device is advantageous in improving the S/N ratio (signal/noise ratio) of a detector that detects near-infrared light.
  • the first minimum value 8 and the second minimum value 9 are preferably less than 50% of the intensity maximum value of the second light component 6, more preferably less than 30%.
  • the wavelength difference between the wavelength on the longer wavelength side and the wavelength on the lower wavelength side at which the intensity is 50% of the maximum intensity is preferably 50 nm or more and less than 200 nm, It is more preferably 50 nm or more and less than 150 nm.
  • the first light component 5 preferably has a maximum intensity value in a wavelength range of 570 nm or more and less than 650 nm, and more preferably has a maximum intensity value in a wavelength range of 580 nm or more and less than 620 nm.
  • the visible light component becomes a yellow-orange-red light component. Therefore, the light-emitting device can easily reflect light components of yellow to orange to red, is difficult to detect with only near-infrared rays, and can detect brown organic foreign matter.
  • organic foreign matters include brown hair, dry leaves, dry grass, and the like.
  • the first light component 5 is preferably derived from fluorescence emitted by a Ce 3+ or Eu 2+ activated phosphor.
  • a Ce 3+ or Eu 2+ activated phosphor exhibits a short afterglow optical property that makes it difficult to saturate the fluorescence output even under high-density excitation.
  • commercially available phosphors for LED lighting can be used as they are, the light emitting device can be advantageous for rapid product development and industrial production.
  • the first light component 5 preferably contains a fluorescent component having an intensity maximum in the wavelength range of 570 nm or more and less than 650 nm.
  • the fluorescent component is preferably derived from the first phosphor 1 activated with Ce 3+ and having a garnet-type crystal structure.
  • the second light component 6 is preferably derived from the fluorescence component of the second phosphor 2 having an excitation peak within the wavelength range of 450 nm or more and less than 520 nm. In this way, among the fluorescence components emitted by the first phosphor 1, the bluish-green light component located on the short wavelength side is absorbed by the second phosphor 2, and the yellowish green to orange light component located on the long wavelength side is absorbed by the second phosphor 2. is less likely to be absorbed by the second phosphor 2 . As a result, the fluorescence component emitted by the first phosphor 1 is shifted to a longer wavelength, so that the light emitting device is advantageous in detecting brown foreign matter.
  • the first light component 5 preferably contains a fluorescence component having a maximum intensity value in the wavelength range of 600 nm or more and less than 660 nm.
  • the fluorescent component is preferably derived from the first phosphor 1 made of a Eu 2+ -activated nitride or oxynitride.
  • the second light component 6 preferably originates from the fluorescence component of the second phosphor 2 having an excitation peak within the wavelength range of 600 nm or more and less than 750 nm. In this way, among the fluorescence components emitted by the first phosphor 1, the red to deep red light components located on the long wavelength side are absorbed by the second phosphor 2, and the yellow light components located on the short wavelength side are absorbed. Green to orange light components are less likely to be absorbed by the second phosphor 2 . As a result, the light-emitting device is advantageous in detecting brown foreign matter.
  • the first light component 5 should be derived from at least one type of first phosphor 1 . Therefore, the first phosphor 1 may be composed of only one type of phosphor, or may be composed of a plurality of types of phosphors.
  • the first light component 5 preferably consists of at least a part of the light component emitted by the wavelength-converting light-emitting device, which is a combination of the solid-state light-emitting device and the phosphor.
  • both the first light component 5 and the third light component 7 are preferably light components emitted by the wavelength conversion type light emitting device. In this way, a commercially available white LED light source can be used as it is, so that the light emitting device is advantageous for rapid product development and industrial production.
  • the second light component 6 preferably originates from the fluorescence emitted by the Cr 3+ -activated phosphor. Moreover, the second light component 6 is preferably derived from fluorescence emitted by a phosphor having a garnet-type crystal structure. Cr 3+ -activated phosphors tend to have the property of absorbing visible light, particularly blue or red light, and converting it into near-infrared fluorescence. Therefore, the blue light emitted by the wavelength-converted light-emitting element including the blue LED and the red light emitted by the wavelength-converted light-emitting element including the red phosphor can be used as excitation light, which facilitates the manufacture of the light-emitting device.
  • Activation with Cr 3+ also facilitates a phosphor having an excitation peak in the wavelength range of 450 nm or more and less than 520 nm or a phosphor having an excitation peak in the wavelength range of 600 nm or more and less than 750 nm. Furthermore, it becomes easy to change the light absorption peak wavelength and the fluorescence peak wavelength, that is, to change the excitation spectrum shape and the fluorescence spectrum shape, depending on the type of the matrix of the phosphor to which the activator is added. Therefore, it is possible to easily control the spectral distribution of the output near-infrared light component.
  • the spectral distribution of the second light component 6 has a normal distribution or a spectral distribution close to this. It is preferable to have Therefore, it is preferable that the intensity of the spectral distribution of the second light component 6 does not change abruptly in the long wavelength range of 700 nm or more. Further, it is more preferable that the intensity of the spectral distribution of the second light component 6 does not change abruptly at least within the wavelength range of 700 nm or more and less than 850 nm.
  • the spectral distribution of the second light component 6 preferably does not change by more than ⁇ 8%/nm in the long wavelength range of 700 nm or more, and preferably does not change by more than ⁇ 3%/nm. more preferred.
  • the spectral distribution of the second light component 6 preferably does not change by more than ⁇ 8%/nm, and does not change by more than ⁇ 3%/nm, at least within the wavelength range of 700 nm or more and less than 850 nm. more preferred.
  • ⁇ P be the wavelength showing the maximum intensity value
  • ⁇ S and ⁇ L be the wavelengths on the short wavelength side and the long wavelength side where the intensity is half of the maximum intensity value, respectively.
  • ⁇ P , ⁇ S and ⁇ L are 1 ⁇ ( ⁇ L ⁇ P )/( ⁇ P ⁇ S ) ⁇ 2.0, preferably 1 ⁇ ( ⁇ L ⁇ P )/( ⁇ P ⁇ S ) ⁇ 1.8. This makes it possible to suppress the generation of false signals after the Fourier transform and allow the detector to detect detection signals with excellent quality.
  • At least one of the first light component 5 and the third light component 7 preferably has a blue-green to green-yellow to orange light with a wavelength of 510 nm or more and less than 600 nm, and a green to yellow light with a wavelength of 530 nm or more and less than 580 nm. Having light is more preferable. At least one of the first light component 5 and the third light component 7 more preferably has green light with a wavelength of 545 nm or more and less than 565 nm. Such first light component 5 and third light component 7 have a high light intensity that is perceived by human eyes. Therefore, the output light 4 is such that the object to be irradiated can be easily visually recognized by the human eye.
  • At least one of the first light component 5 and the third light component 7 preferably has blue to blue green to green light with a wavelength of 460 nm or more and less than 550 nm, and blue green to green light with a wavelength of 480 nm or more and less than 530 nm. It is more preferable to have Further, at least one of the first light component 5 and the third light component 7 preferably has blue-green to green light with a wavelength of 490 nm or more and less than 520 nm. Such a first light component 5 and a third light component 7 have a high intensity with which the human eye perceives light in scotopic vision with a small amount of light. Therefore, the output light 4 is such that the object to be irradiated can be easily visually recognized in the dark.
  • At least one of the first light component 5 and the third light component 7 preferably has light with a wavelength of 610 nm or more and less than 670 nm, and more preferably has red light with a wavelength of 630 nm or more and less than 660 nm.
  • Such first light component 5 and third light component 7 make the skin color of the irradiated object look beautiful and colorful. Therefore, it becomes the output light 4 that improves the appearance of the illuminated person's face and skin, and the appearance of reddish meat and fruit.
  • the intensity of the second light component 6 decreases as the wavelength increases with the wavelength of 850 nm as the starting point.
  • the second light component 6 preferably has a fluorescence intensity at a wavelength of 1000 nm that is less than 10% of the fluorescence intensity at a wavelength of 850 nm.
  • the wavelength as the starting point is preferably shorter than 850 nm, for example, 800 nm.
  • the fluorescence intensity of the second light component 6 at a wavelength of 1000 nm is preferably less than 10% of the fluorescence intensity at a wavelength of 800 nm.
  • the second light component 6 has a fluorescence intensity at a wavelength of 950 nm that is less than 10% of the fluorescence intensity at a wavelength of 800 nm. In this way, the ratio of near-infrared rays and mid-infrared rays on the long-wavelength side, which tend to function as heat rays, is reduced. Therefore, the light-emitting device is advantageous for inspecting objects such as foodstuffs that are adversely affected by heat.
  • the spectral distribution of the output light 4 has a first minimum 8 between the first light component 5 and the second light component 6, the first minimum 8 being the intensity maximum of the second light component 6. is preferably less than 50% of Furthermore, the second light component 6 preferably has a wavelength difference of more than 70 nm, more than 100 nm, between the wavelength on the long wavelength side and the wavelength on the short wavelength side, which has an intensity that is 50% of the maximum intensity value. is more preferable. By doing so, the visible light component and the near-infrared light component are separated, and the output light 4 having the near-infrared light over a wide wavelength range is obtained. Therefore, the light-emitting device is advantageous for inspection and evaluation of an object whose absorption wavelength of near-infrared light differs or tends to vary depending on the surrounding environment.
  • the mixed light of the first light component 5, the second light component 6 and the third light component 7 may include a blue light component, a blue-green-green-yellow light component, and a red light component.
  • the blue light component is a light component within a wavelength range of 435 nm or more and less than 480 nm, and is preferably a light component having a maximum intensity value within the wavelength range.
  • the blue-green-green-yellow light component is a light component within a wavelength range of 500 nm or more and less than 580 nm, and is preferably a light component having a maximum intensity value within the wavelength range.
  • the red light component is a light component within a wavelength range of 600 nm or more and less than 700 nm, and preferably has a maximum intensity value within the wavelength range.
  • the output light 4 includes light components of blue, green, and red, which are the three primary colors of light, and the light emitting device can output visible light with high color rendering properties. Therefore, the light-emitting device is advantageous in making the object to be irradiated look as it is.
  • it since it emits many light components of the three primary colors of light (blue, green, and red) and near-infrared light, it becomes a light-emitting device that is highly compatible with an imaging technique called RGB-NIR imaging.
  • the third light component 7 can be a blue light component that originates from the primary light 3B emitted by the solid-state light emitting device 3 and has a maximum intensity within a wavelength range of 435 nm or more and less than 480 nm, preferably 440 nm or more and less than 470 nm. .
  • Such a third light component 7 can easily be obtained using a light emitting diode (LED) or laser diode (LD) emitting blue light. Therefore, the light-emitting device is advantageous for product development and industrial production.
  • the first light component 5 is preferably light obtained by wavelength-converting the third light component 7 with the first phosphor 1 (first wavelength-converted light 1B). In this way, the energy difference (Stokes shift) between light absorption and fluorescence emission by the first phosphor 1 is reduced. Therefore, it is possible to suppress a phenomenon (temperature quenching) in which the first phosphor 1 generates heat due to energy loss caused by wavelength conversion and is quenched due to temperature rise of the phosphor. Therefore, the light emitting device can output the first light component 5 with high photon conversion efficiency.
  • the second light component 6 is preferably light obtained by wavelength-converting the first light component 5 with the second phosphor 2 (second wavelength-converted light 2B). In this way, the energy difference between light absorption and fluorescence emission by the second phosphor 2 is reduced, so temperature quenching of the second phosphor 2 can be suppressed. Therefore, the light emitting device can output the second light component 6 with high photon conversion efficiency.
  • the integrated value of the energy intensity in the light component with a wavelength of less than 700 nm is preferably less than half, and preferably less than 1/3, of the integrated value of the energy intensity in the light component with a wavelength of 700 nm or more. more preferred.
  • the energy intensity of the light component including the near-infrared light becomes higher than the energy intensity of the light component of the visible light. Therefore, it is suitable for high-precision non-destructive inspection, non-destructive inspection of minute objects, wide-area non-destructive inspection, and non-destructive inspection of large or thick objects. It becomes possible to confirm with the human eye.
  • the light emitting device since the light emitting device emits the output light 4 with a small proportion of the visible light component, the light emitting device is advantageous in alleviating the glare of the output light 4 .
  • the output light 4 can exhibit white color.
  • the light components can be selected such that the first light component 5, the second light component 6 and the third light component 7 produce white light by additive color mixing.
  • the light-emitting device simultaneously emits light having a color tone close to that of natural light and high-output near-infrared rays, and serves both general lighting and industrial lighting. Therefore, the light-emitting device is suitable for a detection device for detecting the state of an object to be irradiated and an inspection device for inspecting the internal structure and defects of an object to be irradiated under a nearly natural appearance.
  • the output light 4 preferably has a correlated color temperature of 2600K or more and less than 12000K, more preferably 3000K or more and less than 8000K.
  • the output light 4 preferably has a general color rendering index (Ra) of 80 or more and less than 100.
  • Ra general color rendering index
  • the appearance of fruits and vegetables, meat, fresh fish, and the like can be made good with a sense of freshness by light with high color rendering properties.
  • by detecting the near-infrared reflected light or transmitted light that illuminates them it is possible to evaluate the degree of damage and freshness inside them. Therefore, it is possible to grasp the degree of damage of the products displayed in the sales floor without being noticed by a third party, and to quickly remove the damaged products from the sales floor or the like.
  • the human face, skin, internal organs, etc. can be made to look beautiful with high-color-rendering light.
  • Light with a small general color rendering index is light that is advantageous for increasing the luminous flux, and light with a large general color rendering index is light that is close to natural light.
  • the light emitting device of the present embodiment makes the space look as good as when it is illuminated with natural light, and can detect the state of the object to be illuminated by near-infrared light without being noticed by people. can be monitored and measured.
  • the white output light 4 preferably has spectral intensity over the entire wavelength range of 440 nm or more and less than 660 nm, preferably 430 nm or more and less than 900 nm. In other words, it is preferable that the output light 4 have a spectral distribution in which there is no wavelength component with zero intensity in the above wavelength range.
  • Such output light 4 can illuminate an object with many different wavelengths of light, ranging from short wavelength visible (violet-blue) to near-infrared. Therefore, the light emitting device is advantageous for hyperspectral imaging in which reflected light that differs depending on the wavelength is photographed and aggregated to visualize the characteristics of the irradiated object.
  • the intensity of light components with long wavelengths of 700 nm or longer exhibits the maximum value.
  • the maximum intensity value of the light component with a wavelength of 700 nm or more is preferably more than 1.5 times the maximum intensity value of the light component with a wavelength of 380 nm or more and less than 700 nm, and more than 2 times. is more preferable, and more than 3 times is even more preferable.
  • the maximum intensity value of the light component within the wavelength range of 380 nm or more and less than 700 nm is preferably less than 50%, and less than 30%, of the maximum intensity value of the light component having a wavelength of 700 nm or more. is more preferably less than 10%.
  • the spectral distribution of the output light 4 preferably does not substantially contain light components in the ultraviolet region with a wavelength of less than 380 nm.
  • the light-emitting device can convert input power only into visible light and infrared light, and has high energy conversion efficiency into visible light and infrared light.
  • the spectral distribution of the output light 4 preferably has a broad fluorescent component derived from the 4 T 2 ⁇ 4 A 2 electronic energy transition of Cr 3+ ions, as shown as the second light component 6 .
  • the fluorescent component preferably has a fluorescence peak in a wavelength range of 700 nm or more.
  • the spectral distribution of the output light 4 preferably has light components over the entire visible wavelength range of at least 410 nm to less than 700 nm, preferably 380 nm to less than 780 nm. As a result, not only can the object to be illuminated be visible to the human eye, but it can also have light components that can be used for spectral imaging over the entire visible wavelength range.
  • the solid-state light-emitting element 3 and the first wavelength conversion body 1A can be combined to form a wavelength conversion type light-emitting element.
  • the wavelength-converting light-emitting elements that emit light with a correlated color temperature of 2600K or more and less than 12000K, many white LED products with various specifications and forms are available on the market. Therefore, by using the wavelength-converting light-emitting device, it is possible to quickly respond to the customer's request in the process from design to product development and industrial production with a small number of man-hours.
  • FIG. 2 shows a light-emitting device 10A using one solid-state light-emitting element 3, one first wavelength converter 1A, and one second wavelength converter 2A.
  • FIG. 3 shows a light-emitting device 10B using a plurality of first wavelength-converting light-emitting elements in which solid-state light-emitting elements 3 and first wavelength conversion bodies 1A are combined, and further using one second wavelength conversion body 2A.
  • FIG. 4 shows a light-emitting device 10C in which a plurality of solid-state light-emitting elements 3, a first wavelength conversion body 1A and a second wavelength conversion body 2A are combined one by one.
  • FIG. 5 shows a first wavelength conversion type light emitting device combining the solid light emitting device 3 and the first wavelength conversion body 1A, and a second wavelength conversion type light emitting device combining the solid light emitting device 3 and the second wavelength conversion body 2A.
  • a light-emitting device 10D using a light-emitting element is shown. 2 to 5 omit a power supply and the like, which are components of the light emitting device.
  • the light emitting device 10 includes a solid light emitting element 3, a first wavelength conversion body 1A including a first phosphor 1, and a second wavelength including a second phosphor 2. It is a light-emitting device that includes a conversion body 2A and emits output light 4.
  • FIG. 10 at least one of the first wavelength converter 1A and the second wavelength converter 2A may be a wavelength converter containing both the first phosphor and the second phosphor. .
  • the solid state light emitting device 3 emits primary light 3B.
  • the first wavelength converter 1A absorbs at least part of the primary light 3B and converts it into first wavelength-converted light 1B having a fluorescence peak within the visible wavelength range of 380 nm or more and less than 700 nm.
  • the second wavelength conversion body 2A absorbs a portion of at least one of the primary light 3B and the first wavelength-converted light 1B and converts it into the second wavelength-converted light 2B.
  • the second wavelength-converted light 2B has a fluorescence peak in the wavelength range above 700 nm, preferably above 750 nm.
  • the second wavelength-converted light 2B has a near-infrared light component within a wavelength range of 700 nm or more and less than 2500 nm, preferably 780 nm or more and less than 1000 nm.
  • the first light component 5 originating from the first wavelength-converted light 1B, the second light component 6 originating from the second wavelength-converted light 2B, and the primary light 3B originating from An output light 4 can be emitted that includes a third light component 7 .
  • the light emitting device 10 can have a transmissive configuration as shown in FIGS. Specifically, the first wavelength conversion body 1A receives the primary light 3B from the front surface 1Aa, and emits the primary light 3B and the first wavelength-converted light 1B from the rear surface 1Ab. Further, the second wavelength conversion body 2A receives the primary light 3B and the first wavelength-converted light 1B at the front face 2Aa, and the primary light 3B, the first wavelength-converted light 1B and the second wavelength-converted light from the rear face 2Ab. Emit 2B. In this configuration, mixed light of first wavelength-converted light 1B, second wavelength-converted light 2B, and primary light 3B is output from a common output surface of the light emitting device.
  • the first wavelength conversion body 1A and the second wavelength conversion body 2A preferably have a structure that transmits both the primary light 3B and the first wavelength-converted light 1B. That is, both the primary light 3B and the first wavelength-converted light 1B can pass through the first wavelength-converting body 1A and the second wavelength-converting body 2A and be output from the light-emitting device together with the second wavelength-converted light 2B.
  • a structure is preferred. As a result, the light output surface that emits the output light 4 falls within the larger area of the first wavelength conversion body 1A and the second wavelength conversion body 2A, so that the light emitting device can be miniaturized. .
  • the first wavelength converter 1A is arranged on the side closer to the solid-state light-emitting element 3, and the second wavelength converter 2A is arranged on the far side.
  • the arrangement of the first wavelength converter 1A and the second wavelength converter 2A can be reversed.
  • the light-emitting device 10 includes a first wavelength-converting light-emitting element combining a solid-state light-emitting element 3 and a first wavelength conversion body 1A, and a solid-state light-emitting element 3 and a second wavelength conversion body 2A.
  • a configuration in which the combined second wavelength conversion type light emitting device is arranged in parallel can also be employed.
  • the first wavelength conversion body 1A receives the primary light 3B from the front surface 1Aa, and emits the primary light 3B and the first wavelength-converted light 1B from the rear surface 1Ab.
  • the second wavelength conversion body 2A receives the primary light 3B from the front surface 2Aa, and emits the primary light 3B and the second wavelength-converted light 2B from the rear surface 2Ab. Then, mixed light of the first wavelength-converted light 1B, the second wavelength-converted light 2B, and the primary light 3B is output from the output surface of the light emitting device 10D.
  • the solid-state light-emitting device 3 is a light-emitting device that emits primary light 3B, and is preferably a light-emitting diode or a laser diode. Note that the solid-state light-emitting device 3 is not limited to these, and any solid-state light-emitting device can be used as long as it can emit the primary light 3B.
  • the light-emitting device 10 can be expected to output light containing a near-infrared light component of several hundred mW class. can.
  • the light output of the light emitting device 10 can be expected to be several W class.
  • the light output of the light emitting device 10 can be expected to exceed 10 W.
  • the light output of the light emitting device 10 can be expected to exceed 30 W.
  • the first wavelength conversion body 1A is irradiated with high-density spot light.
  • the light-emitting device 10 becomes a high-output point light source, so that the range of industrial use of solid-state lighting can be expanded.
  • the laser diode for example, an edge emitting laser (EEL), a vertical cavity surface emitting laser (VCSEL), or the like can be used.
  • the solid-state light-emitting element 3 and the first wavelength converter 1A and the second wavelength converter 2A are spatially separated from each other.
  • the light-emitting unit is light and can be freely moved, and the light-emitting device can easily change the irradiation location.
  • the number of solid-state light-emitting devices 3 is plural. As a result, the output of the primary light 3B can be increased, and the light emitting device is advantageous in increasing the output.
  • the number of solid-state light emitting devices is not particularly limited, but may be, for example, 9 or more, 16 or more, 25 or more, 36 or more, 49 or more, 64 or more, 81 or more, or 100 or more. can.
  • the upper limit of the number of solid-state light-emitting devices is not particularly limited, but may be, for example, 9, 16, 25, 36, 49, 64, 81, or 100.
  • the solid-state light-emitting element 3 is preferably a surface-emitting type surface-emitting light source.
  • the optical energy density of the primary light 3B emitted by the solid-state light emitting device 3 preferably exceeds 0.3 W/mm 2 and more preferably exceeds 1.0 W/mm 2 .
  • the primary light 3B has a high optical energy density, relatively strong output light 4 can be emitted when the first wavelength conversion body 1A is irradiated with the diffused primary light 3B.
  • the output light 4 having a high light energy density can be emitted.
  • the upper limit of the light energy density of the primary light 3B emitted by the solid-state light emitting device 3 is not particularly limited, it can be set to 30 W/mm 2 , for example.
  • the primary light 3B may be light that can be partially absorbed by the first wavelength converter 1A and converted into the first wavelength-converted light 1B having a fluorescence peak within the wavelength range of 380 nm or more and less than 780 nm. .
  • the primary light 3B includes long wavelength ultraviolet rays (UV-A: 315 nm or more and less than 400 nm), purple or blue (380 nm or more and less than 495 nm), green or yellow (495 nm or more and less than 590 nm), and orange or red ( 590 nm or more and less than 750 nm).
  • the primary light 3B is preferably light having a maximum intensity within a wavelength range of 435 nm or more and less than 560 nm, particularly a wavelength of 440 nm or more and less than 480 nm. In this way, orthodox blue LEDs or white LEDs with blue LED specifications can be used, facilitating rapid product development and industrial production.
  • the primary light 3B is preferably supplied from a plurality of solid-state light emitting devices with photons constituting the primary light.
  • a large number of photons can be supplied to the first wavelength conversion body 1A in proportion to the number of the solid-state light-emitting elements 3, so that the light-emitting device is advantageous in increasing the output of the output light 4.
  • First wavelength converter> 1 A of 1st wavelength converters can be made into the wavelength converter which sealed the 1st fluorescent substance 1 with the silicone resin.
  • the first wavelength converter 1A can be an all-inorganic wavelength converter in which the first phosphor 1 is sealed with low-melting-point glass.
  • the first wavelength converter 1A can be an all-inorganic wavelength converter mainly composed of the first phosphor 1 by using a binder or the like.
  • the first wavelength converter 1A can also be a sintered body obtained by sintering the first phosphor 1, that is, a fluorescent ceramic. Further, such a wavelength conversion body can be in a composite form, for example, it can be in a structure in which these are laminated.
  • the resin-sealed wavelength conversion body can be manufactured relatively easily using a powdered phosphor, so it becomes a relatively inexpensive light-emitting device.
  • the all-inorganic wavelength converter has excellent thermal conductivity and facilitates heat radiation design, so that the temperature rise of the wavelength converter can be suppressed and a light emitting device capable of outputting at a high wattage can be obtained.
  • the thickness of the first wavelength converter 1A is not particularly limited, the maximum thickness is preferably 100 ⁇ m or more and less than 5 mm, more preferably 200 ⁇ m or more and less than 1 mm.
  • the first wavelength converter 1A is preferably arranged so as to cover the entire light output surface of the solid light emitting device 3, and is arranged so as to cover the entire light output surface of the surface emitting light source. more preferred.
  • the primary light 3B efficiently irradiates the first wavelength conversion body 1A, so that the conversion efficiency of the primary light 3B into the first wavelength-converted light 1B can be increased.
  • the first wavelength converter 1A preferably has translucency. Thereby, the light component wavelength-converted inside the wavelength converter can be emitted through the first wavelength converter 1A.
  • the first phosphor 1 is a phosphor that absorbs the primary light 3B and converts it into the first wavelength-converted light 1B.
  • the output light 4 includes a blue light component.
  • the output light 4 is a blue-green light component. including.
  • the output light 4 is a green light component.
  • Output light 4 contains a yellow light component by using a phosphor that emits yellow or orange wavelength-converted light that exhibits a maximum intensity in the wavelength range of 560 nm or more and less than 600 nm as the first phosphor 1 .
  • output light 4 contains the red light component.
  • the output light 4 is easily visible in darkness.
  • a phosphor that emits green light with high luminosity in photopic vision the output light 4 is easily visible in a bright place.
  • the output light 4 can be used in a working environment using a resin that is sensitive to ultraviolet light and blue light.
  • the output light 4 can make reddish meat, tuna, apples, or the like, or human skin, look good.
  • the first phosphor 1 a phosphor activated by at least one of rare earth ions and transition metal ions to emit visible fluorescence can be used. At least one of Ce 3+ and Eu 2+ is preferable as the rare earth ion. Mn 4+ is preferred as the transition metal ion.
  • the first phosphor 1 is preferably an oxide, sulfide, nitride, halide, oxysulfide, oxynitride, or oxyhalide containing the fluorescent ion (luminescence center).
  • the first phosphor 1 includes halophosphates, phosphates, halosilicates, silicates, aluminates, aluminosilicates, borates, germanates, silicate nitrides, and aluminosilicate nitrides. It is preferably at least one selected from the group consisting of salts, silicate oxynitrides, and aluminosilicate oxynitrides. Then, as the first phosphor 1, one suitable for lighting design may be appropriately selected and used.
  • the first phosphor 1 should emit wavelength-converted light that exhibits the maximum intensity at the longest possible wavelength. is preferred. Therefore, the first phosphor 1 preferably contains a red phosphor that emits light having a maximum intensity in the wavelength range of 600 nm or more and less than 660 nm. Thereby, red light can be used to excite the second phosphor 2 contained in the second wavelength conversion body 2A. Therefore, the Stokes loss due to the second wavelength converter 2A can be reduced, and the temperature quenching of the second phosphor 2 can be suppressed.
  • the red phosphor is preferably an Eu 2+ -activated composite nitride phosphor or composite oxynitride phosphor.
  • Examples of such Eu 2+ -activated nitride-based phosphors include alkaline earth metal oxynitride aluminosilicates, alkaline earth metal oxynitride aluminosilicates, alkaline earth metal oxynitride aluminosilicates. Phosphors can be mentioned.
  • MAlSiN 3 :Eu 2+ , MAlSi 4 N 7 :Eu 2+ , and M 2 Si 5 N 8 :Eu 2+ can be mentioned as Eu 2+ -activated nitride phosphors.
  • M is at least one element selected from the group consisting of Ca, Sr and Ba.
  • Eu 2+ -activated nitride-based phosphor a phosphor obtained by replacing part of the combination of Si 4+ -N 3+ in the composition of the above compound with Al 3+ -O 2- can also be mentioned.
  • Eu 2+ -activated nitride-based phosphors have the property of absorbing light components over a wide wavelength range from blue to green to yellow to orange and converting them into red light. Therefore, as the solid-state light-emitting element 3, a solid-state light-emitting element that emits not only blue light but also green light or yellow light can be used. Therefore, it is easy to reduce the Stokes loss at the time of wavelength conversion to near-infrared rays, and it is possible to improve the efficiency of the output light 4 .
  • the first wavelength conversion body 1A is the first wavelength conversion body with short afterglow. It is preferable that the phosphor 1 is included. Therefore, it is also preferable that the first phosphor 1 contained in the first wavelength converter 1A is only the phosphor activated with Ce 3+ .
  • the Ce 3+ -activated phosphor is preferably a composite oxide phosphor having a garnet-type crystal structure (Ce 3+ -activated garnet phosphor).
  • Ce 3+ -activated garnet phosphors include rare earth aluminum garnet phosphors, rare earth silicon garnet phosphors, and garnet compounds as solid solutions composed of these as end members.
  • the rare earth aluminum garnet phosphors are Lu3Al2 ( AlO4 ) 3 : Ce3 + , Y3Al2 ( AlO4 ) 3 : Ce3 + , Lu3Ga2 ( AlO4 ) 3 : Ce3 + , Y3Ga2 (AlO 4 ) 3 :Ce 3+ may be mentioned.
  • Rare earth silicon garnet phosphors include Lu 2 CaMg 2 (SiO 4 ) 3 :Ce 3+ .
  • the first wavelength-converted light 1B becomes a visible light component having a maximum intensity within the wavelength range of 435 nm or more and less than 700 nm.
  • the first wavelength-converted light 1B has a maximum intensity within a wavelength range of 500 nm or more and less than 600 nm, particularly 510 nm or more and less than 560 nm.
  • the first wavelength-converted light 1B is light having a maximum intensity within a wavelength range of 600 nm or more and less than 660 nm, particularly 610 nm or more and less than 650 nm.
  • ⁇ Second wavelength converter> 2 A of 2nd wavelength converters can be used as the wavelength converter which sealed the 2nd fluorescent substance 2 with the silicone resin.
  • the second wavelength converter 2A can be an all-inorganic wavelength converter in which the second phosphor 2 is sealed with low-melting-point glass.
  • the second wavelength converter 2A can be an all-inorganic wavelength converter mainly composed of the second phosphor 2 by using a binder or the like.
  • the second wavelength converter 2A can also be a sintered body obtained by sintering the second phosphor 2, that is, a fluorescent ceramic. Since the form of the second wavelength conversion body 2A is the same as that of the first wavelength conversion body 1A, redundant description will be omitted.
  • the second wavelength converter 2A is preferably arranged so as to cover the entire first wavelength converter 1A.
  • the primary light 3B that has passed through the first wavelength converter 1A and the first wavelength-converted light 1B emitted from the first wavelength converter 1A are efficiently irradiated onto the second wavelength converter 2A. be. Therefore, the conversion efficiency from the primary light 3B and the first wavelength-converted light 1B to the second wavelength-converted light 2B can be increased.
  • the second wavelength converter 2A preferably has translucency.
  • the light component wavelength-converted inside the wavelength converter can also pass through the second wavelength converter 2A and be emitted.
  • the second wavelength conversion body 2A preferably transmits the second wavelength-converted light 2B, particularly light with a wavelength of 750 nm.
  • the second wavelength converter 2A transmits the near-infrared light component, it is suppressed that the photons inside the wavelength converter are absorbed by the wavelength converter itself and disappear.
  • the second phosphor 2 is a phosphor that absorbs at least one of the primary light 3B and the first wavelength-converted light 1B and converts it into the second wavelength-converted light 2B.
  • the second phosphor 2 for example, various inorganic phosphors (near-infrared phosphors) known for near-infrared light sources can be used.
  • the output light 4 has absorption wavelengths of various gas molecules (for example, O 2 : 760 nm, NO 2 : 830 nm, H 2 O: 1365 nm, NH 3 : 1530 nm, C 2 H 2 : 1530 nm, CO: 1567 nm, CO 2 : 1573 nm, CH 4 : 1651 nm).
  • various gas molecules for example, O 2 : 760 nm, NO 2 : 830 nm, H 2 O: 1365 nm, NH 3 : 1530 nm, C 2 H 2 : 1530 nm, CO: 1567 nm, CO 2 : 1573 nm, CH 4 : 1651 nm.
  • the primary light 3B or the first wavelength-converted light 1B is light that exhibits the maximum intensity within the wavelength range of 380 nm or more and less than 700 nm, particularly light that exhibits the maximum intensity within the wavelength range of 440 nm or more and less than 500 nm;
  • the light exhibits the maximum intensity within the wavelength range of 580 nm or more; or the light exhibits the maximum intensity within the wavelength range of 600 nm or more and less than 680 nm.
  • near-infrared spectroscopy can be used to obtain information about oxygen (O 2 ), nitrogen dioxide (NO 2 ) and substances containing these components.
  • the second phosphor 2 used for this purpose emits wavelength-converted light having a maximum intensity within a wavelength range of more than 700 nm and less than 900 nm, preferably more than 750 nm and less than 850 nm. Phosphors are preferred.
  • Near-infrared spectroscopy can be used to obtain information about water (H 2 O) and substances containing water.
  • the second phosphor 2 used for this purpose emits wavelength-converted light having a maximum intensity within a wavelength range of more than 1200 nm and less than 1500 nm, preferably more than 1275 nm and less than 1425 nm. Phosphors are preferred.
  • the second phosphor 2 used for this purpose emits wavelength-converted light having a maximum intensity within a wavelength range of more than 1400 nm and less than 1800 nm, preferably more than 1500 nm and less than 1700 nm. Phosphors are preferred.
  • the maximum intensity value within the wavelength range of more than 750 nm and less than 850 nm is less than 10% of the maximum intensity value within the wavelength range of 700 nm or more and less than 1700 nm. is preferred.
  • a phosphor whose intensity maximum value in the wavelength range of more than 700 nm and less than 900 nm is less than 10% of the intensity maximum value in the wavelength range of 700 nm or more and less than 1700 nm can be used. preferable.
  • the maximum intensity within the wavelength range of more than 1275 nm and less than 1425 nm is less than 10% of the maximum intensity within the wavelength range of 700 nm or more and less than 1700 nm. is preferred.
  • a phosphor whose intensity maximum value in the wavelength range of more than 1200 nm and less than 1500 nm is less than 10% of the intensity maximum value in the wavelength range of 700 nm or more and less than 1700 nm can be used. preferable.
  • the absorption of the second wavelength-converted light 2B emitted from the second phosphor 2 by ammonia, hydrocarbons, and carbon oxides may adversely affect objects and systems.
  • the maximum intensity within the wavelength range of more than 1500 nm and less than 1700 nm is less than 10% of the maximum intensity within the wavelength range of 700 nm or more and less than 1700 nm. is preferred.
  • a phosphor whose intensity maximum value in the wavelength range of more than 1400 nm and less than 1800 nm is less than 10% of the intensity maximum value in the wavelength range of 700 nm or more and less than 1700 nm can be used. preferable.
  • a light-emitting device that uses a phosphor that emits near-infrared wavelength-converted light as the second phosphor 2 outputs a light component with a high spectral sensitivity of the photodiode. And photodiodes are used exclusively in sensors for detectors. Therefore, such a light-emitting device can be suitably used for an inspection device using a photodiode.
  • the second phosphor 2 is a phosphor that emits wavelength-converted light that exhibits a maximum intensity within a wavelength range of 700 nm or more and less than 1100 nm.
  • the second phosphor 2 is more preferably a phosphor that emits wavelength-converted light that exhibits a maximum intensity within a wavelength range of 780 nm or more and less than 1050 nm, particularly within a wavelength range of 800 nm or more and less than 1000 nm. .
  • the second phosphor 2 is preferably a phosphor that emits wavelength-converted light that exhibits a maximum intensity within the wavelength range of 700 nm or more and less than 1600 nm.
  • the second phosphor 2 is more preferably a phosphor that emits wavelength-converted light having a maximum intensity within a wavelength range of 1100 nm or more and less than 1550 nm, particularly 1300 nm or more and less than 1500 nm.
  • the second phosphor 2 is preferably a phosphor that emits wavelength-converted light that exhibits a maximum intensity within the wavelength range of 900 nm or more and less than 1650 nm.
  • the second phosphor 2 is more preferably a phosphor that emits wavelength-converted light having a maximum intensity within a wavelength range of 1000 nm or more and less than 1600 nm, particularly 1100 nm or more and less than 1600 nm.
  • a light-emitting device that uses a phosphor that emits near-infrared light on the relatively short wavelength side as the second phosphor 2 is less likely to output a light component with a wavelength of 4000 nm or more that becomes heat rays. Therefore, such a light-emitting device can be suitably used for inspecting objects that are easily degraded by heat.
  • a phosphor that is activated by at least one of rare earth ions and transition metal ions and emits fluorescence containing near-infrared light components can be used.
  • the rare earth ion is preferably at least one selected from the group consisting of Nd 3+ , Eu 2+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ .
  • the transition metal ion is at least one selected from the group consisting of Ti 3+ , V 4+ , Cr 4+ , V 3+ , Cr 3+ , V 2+ , Mn 4+ , Fe 3+ , Co 3+ , Co 2+ and Ni 2+ preferable.
  • the second phosphor 2 contains the above-described ion as a luminescence center, and the base includes oxides, sulfides, nitrides, halides, oxysulfides, A phosphor containing at least one of an oxynitride and an acid halide can be used.
  • the ions that function as fluorescent ions in the second phosphor 2 can be at least one of the above-described rare earth ions and transition metal ions.
  • the fluorescent ions need only have the property of absorbing at least one of the primary light 3B and the first wavelength-converted light 1B and converting them into near-infrared light components.
  • the preferred fluorescent ion is Cr 3+ . That is, the second phosphor 2 preferably contains Cr 3+ as fluorescent ions.
  • the second phosphor 2 having the property of absorbing visible light, particularly blue light or red light, and converting it into a near-infrared light component.
  • Cr 3+ blue light emitted by a wavelength conversion light emitting element including a blue LED and red light emitted by a wavelength conversion light emitting element including a red phosphor can be used as excitation light. Manufacturing becomes easier.
  • the light-emitting device is advantageous in controlling the spectral distribution of the output near-infrared light component.
  • the type of phosphor whose fluorescent ions are Cr 3+ is not particularly limited as long as it absorbs at least one of the primary light 3B and the first wavelength-converted light 1B and converts it into an infrared fluorescent component.
  • the Cr 3+ -activated phosphor a composite metal oxide, which is easy to manufacture, can be mentioned.
  • a preferred phosphor as the second phosphor 2 is a complex oxide phosphor that has a garnet-type crystal structure and is activated with Cr 3+ , which has a lot of practical results.
  • Such Cr 3+ -activated garnet phosphors are preferably rare earth aluminum garnet phosphors.
  • the Cr 3+ -activated garnet phosphor is Y 3 Al 2 (AlO 4 ) 3 :Cr 3+ , La 3 Al 2 (AlO 4 ) 3 :Cr 3+ , Gd 3 Al 2 (AlO 4 ) 3 :Cr 3+ , Y3Ga2 ( AlO4 ) 3 : Cr3 + , La3Ga2 ( AlO4 ) 3 : Cr3 + , Gd3Ga2 ( AlO4 ) 3 : Cr3 + , Y3Sc2 ( AlO4 ) 3 : Cr 3+ , La 3 Sc 2 (AlO 4 ) 3 : Cr 3+ , Gd 3 Sc 2 (AlO 4 ) 3 : Cr 3+ , Y 3 Ga 2 (GaO 4 ) 3 : Cr 3+ , La 3 Ga 2 (GaO 4 ) 3 : Cr 3+ , Gd 3 Ga 2 (GaO 4 ) 3 : Cr 3+ , G
  • the solid-state light-emitting device 3 a solid-state light-emitting device that emits blue light and/or red light can be used. Also, a phosphor that emits light components of blue light and/or red light can be used as the first wavelength converter 1A. As a result, it is possible to obtain the output light 4 containing at least one type (blue or red) light component that constitutes the three primary colors of light (blue, green, and red) and a near-infrared light component.
  • the output light 4 containing at least one type (blue or red) light component that constitutes the three primary colors of light (blue, green, and red) and a near-infrared light component.
  • the solid-state light-emitting device 3 is a solid-state light-emitting device that emits blue light.
  • the first wavelength conversion body 1A is a wavelength conversion body containing a Ce 3+ -activated garnet phosphor that converts blue light to green light and/or an Eu 2+ -activated nitride-based phosphor that converts blue light to red light. do.
  • the second wavelength converter 2A is a wavelength converter containing a Cr 3+ -activated garnet phosphor that converts the primary light 3B and/or the first wavelength-converted light 1B into near-infrared light.
  • the output light 4 with high color rendering, which includes light components that form the three primary colors of light (blue, green, and red) and near-infrared light components.
  • the second wavelength-converted light 2B becomes a near-infrared light component having a maximum intensity within the wavelength range of 700 nm or more and less than 2500 nm.
  • the second wavelength-converted light 2B has a maximum intensity within a wavelength range of 750 nm or more and less than 1800 nm, particularly 780 nm or more and less than 1500 nm.
  • the solid-state light-emitting device 3 when power is supplied to the solid-state light-emitting device 3 to drive it, the solid-state light-emitting device 3 emits primary light 3B.
  • the primary light 3B emitted from the solid-state light-emitting element 3 is incident on the first wavelength conversion body 1A, the first wavelength conversion body 1A absorbs a part of the primary light 3B, and converts the primary light 3B into a light energy lower than that of the primary light 3B. It is converted into one wavelength-converted light 1B.
  • the second wavelength conversion body 2A absorbs part of the mixed light, It is converted into second wavelength-converted light 2B with lower optical energy.
  • the primary light 3B, the first wavelength-converted light 1B and the second wavelength-converted light 2B generated in this manner are the third light component 7, the first light component 5 and the second light component 6, respectively. and is emitted as the output light 4.
  • the primary light 3B, the first wavelength-converted light 1B, and the second wavelength-converted light 2B are emitted from the solid-state light-emitting element 3, the first wavelength-converting body 1A, and the second wavelength-converting body 2A, respectively.
  • Changing the type changes the color tone.
  • the primary light 3B, the first wavelength conversion light 1B and the second wavelength conversion light 2B can be You can also adjust the power ratio. Therefore, the spectral distribution of the output light 4 can be easily controlled.
  • the absolute number of photons forming the output light 4 can be increased by using a high-power solid-state light-emitting element 3 or by increasing the number of light-emitting elements.
  • the light energy of the light component having a wavelength of 700 nm or more in the output light 4 can be made to exceed 3W, preferably 10W, more preferably 30W.
  • Such a high-power light-emitting device can illuminate with strong near-infrared rays, so that relatively strong near-infrared rays can be emitted even if the distance from the object to be irradiated is large.
  • the object to be irradiated is minute or thick, information about the object to be irradiated can be obtained.
  • the density of photons supplied to the phosphor is increased by using a light-emitting element that emits high-density primary light as the solid-state light-emitting element 3, or by condensing the light emitted by the light-emitting element with an optical lens.
  • the optical energy density of the primary light 3B with which the first wavelength conversion body 1A is irradiated can be made to exceed 0.3 W/mm 2 .
  • the light emitting device can emit output light 4 having a high optical energy density. Therefore, the light-emitting device can point-output near-infrared light with high light energy density.
  • the optical energy density of the primary light 3B is 0.3 W/mm 2 , preferably 1.0 W/mm 2 , more preferably 3.0 W/mm 2 . It can be greater than 0 W/mm 2 .
  • the first wavelength conversion body 1A is irradiated with the diffused primary light
  • the light emitting device emits relatively strong output light 4.
  • the first wavelength conversion body 1A is irradiated with primary light that is not light-diffused, the light-emitting device emits output light 4 with high light energy density.
  • the intensity of the light component in the wavelength region shorter than 440 nm in the output light 4 is adjusted to be less than 3% of the maximum fluorescence intensity. be able to.
  • the intensity of the light component in the wavelength region shorter than 440 nm in the output light can also be adjusted to be less than 1% of the maximum fluorescence intensity. In this way, the intensity of the light component in the ultraviolet to blue wavelength region, to which the photoresist is likely to be exposed, becomes output light with an intensity close to zero. Therefore, the light-emitting device is suitable for use in a yellow room and emits near-infrared light that is advantageous for semiconductor-related inspection work.
  • the light emitting device 10 may further include a light distribution control mechanism for controlling light distribution characteristics.
  • a light-emitting device capable of emitting output light having desired light distribution characteristics, such as an in-vehicle variable light distribution lighting system, can be obtained.
  • the light-emitting device 10 may further include an output intensity variable mechanism for changing the intensity of near-infrared rays, such as an input power control device.
  • an output intensity variable mechanism for changing the intensity of near-infrared rays such as an input power control device.
  • the light emitting device 10 may include a control mechanism for controlling, particularly ON-OFF controlling, the output of the second wavelength-converted light 2B. In this way, the output ratio of near-infrared rays can be controlled, so that the light-emitting device is advantageous in adjusting the output intensity of near-infrared rays to meet customer requirements.
  • the light emitting device 10 can also be configured to alternately output the output light 4 containing the second wavelength-converted light 2B and the output light 4 not containing the second wavelength-converted light 2B. In this way, it is possible to check the appearance by the human eye and the appearance by the sensor of the electronic device while alternately switching between them. Therefore, it is possible to eliminate interference between the appearance by the human eye and the appearance by the sensor of the electronic device, and the light-emitting device is advantageous in making the appearance clear regardless of the viewing angle.
  • the light emitting device 10 may have a variable mechanism that changes the peak wavelength of the light component having the maximum fluorescence intensity within the wavelength range of 700 nm or more and less than 2500 nm. With such a configuration, the light-emitting device has great versatility and can be easily applied to miscellaneous uses. In addition, since the penetration depth of the light into the object varies depending on the wavelength, the light emitting device can be useful for inspecting objects in the depth direction.
  • an optical filter such as a band-pass filter or a low-cut filter can be used.
  • the output light 4 may have a structure in which it is output after passing through an optical filter or a structure in which it is blocked by an optical filter.
  • the light-emitting device 10 may include a light control mechanism that controls the output of at least part of the output light 4, not limited to near-infrared light components. With such a configuration, the light-emitting device has great versatility and can easily be used for miscellaneous applications.
  • the light emitting device 10 can also use the output light 4 as pulsed light.
  • the half width of the pulsed light irradiation time can be less than 300 ms. Also, the higher the output intensity of the output light 4 or the second light component 6, the shorter the half width. Therefore, the half width can be less than 100 ms, less than 30 ms, less than 10 ms, less than 3 ms, or less than 1 ms, depending on the output intensity of the output light 4 or the second light component 6 .
  • the pulsed light extinguishing time can be set to 1 ms or more and less than 10 s.
  • one preferred form is a light-off time of less than 30 ms, at which these creatures do not perceive flicker.
  • the extinguishing time of the pulsed light is preferably 100 ms or more, particularly 300 ms or more.
  • the optical energy of the output light is preferably 0.01 J/cm 2 or more and less than 1 J/cm 2 . Therefore, when the light energy of the output light emitted from the light-emitting device is set within this range and the output light is irradiated near the hair root, the light can be absorbed by melanin or the like present in the skin, and as a result, the hair, etc. Growth can be adjusted.
  • the preferred 1/10 afterglow time of the output light 4 that is, the time until the light intensity immediately before turning off is reduced to 1/10 is preferably less than 100 ⁇ s, more preferably less than 10 ⁇ s. , is particularly preferably less than 1 ⁇ s.
  • the light-emitting device can be turned on and off instantaneously.
  • the light emitting device 10 can further include an ultraviolet light source that emits ultraviolet light having a maximum intensity within a wavelength range of 120 nm or more and less than 380 nm, preferably 250 nm or more and less than 370 nm. By doing so, the light-emitting device also has a sterilizing effect by ultraviolet rays.
  • the light emitting device may further include a conventionally known general lighting device.
  • the lighting device is provided with a function of outputting near-infrared light.
  • the lighting device can use a combination of a solid-state light-emitting element and a phosphor.
  • a blue LED and a Ce 3+ -activated garnet phosphor as a green or yellow phosphor are combined.
  • a lighting device comprising a combination of a blue LED, a Ce 3+ -activated garnet phosphor as a green or yellow phosphor, and an Eu 2+ -activated nitride phosphor or Eu 2+ -activated oxynitride phosphor as a red phosphor. mentioned.
  • the light-emitting device of this embodiment that emits near-infrared light components can be used as a light source or lighting device for medical or biotechnology use.
  • the light-emitting device of this embodiment can be a medical light-emitting device used for fluorescence imaging or photodynamic therapy, or a biotechnological light-emitting device used for testing and analysis of cells, genes and specimens. . Since near-infrared light components have the property of penetrating living bodies and cells, such light-emitting devices enable observation and treatment of affected areas from inside and outside the body, and use in biotechnology.
  • the light emitting device of this embodiment can be used as a light source for a sensing system or a lighting system for a sensing system.
  • a near-infrared light component that has the property of penetrating organic matter or a near-infrared light component that is reflected by an object
  • the contents or foreign matter in an organic bag or container can be It can be inspected in an unopened state.
  • such a light-emitting device can be used to monitor animals, plants, and objects including humans.
  • the light-emitting device 10 of the present embodiment is a light-emitting device that includes the solid-state light-emitting element 3 and the phosphor and emits the output light 4 .
  • the spectral distribution of the output light 4 has a first light component 5 and a second light component 6 derived from the fluorescence emitted by the phosphor, and the first light component 5 and the second light component 6 has a first minimum 8 in between.
  • the first light component 5 is a fluorescence component having an intensity maximum within the wavelength range of 560 nm or more and less than 700 nm.
  • the second light component 6 is a fluorescence component having an intensity maximum within the wavelength range of 700 nm or more and less than 2500 nm.
  • the intensity maximum of the second light component 6 is greater than the intensity maximum of the first light component 5 .
  • the first minimum 8 is less than 50% of the intensity maximum of the second light component 6 .
  • the light-emitting device 10 of this embodiment is a light-emitting device that includes a solid-state light-emitting element 3 and a phosphor and emits output light 4 .
  • the spectral distribution of the output light 4 has a first light component 5 and a second light component 6 derived from the fluorescence emitted by the phosphor, and the first light component 5 and the second light component 6 has a first minimum 8 in between.
  • the first light component 5 is a fluorescence component having an intensity maximum within the wavelength range of 380 nm or more and less than 700 nm.
  • the second light component 6 is a fluorescence component having an intensity maximum within the wavelength range of 700 nm or more and less than 2500 nm.
  • the spectral distribution of the second light component 6 does not change more than ⁇ 8%/nm in the wavelength range of 700 nm or more.
  • the intensity maximum of the second light component 6 is greater than the intensity maximum of the first light component 5 .
  • the first minimum 8 is less than 50% of the intensity maximum of the second light component 6 .
  • the light emitting device 10 of the present embodiment is a light emitting device that includes the solid state light emitting element 3, the first phosphor 1 and the second phosphor 2, and emits the output light 4.
  • the spectral distribution of the output light 4 has a first light component 5 derived from the fluorescence emitted by the first phosphor 1 and a second light component 6 derived from the fluorescence emitted by the second phosphor 2, and , has a first minimum 8 between the first light component 5 and the second light component 6 .
  • the first light component 5 is a fluorescence component having an intensity maximum within the wavelength range of 380 nm or more and less than 700 nm.
  • the second light component 6 is a fluorescence component having an intensity maximum within the wavelength range of 700 nm or more and less than 2500 nm.
  • the intensity maximum of the second light component 6 is greater than the intensity maximum of the first light component 5 .
  • the first minimum 8 is less than 50% of the intensity maximum of the second light component 6 .
  • An electronic device includes the light emitting device 10 described above.
  • FIG. 6 schematically shows an example of an electronic device according to this embodiment.
  • the light emitting device 10 includes at least a power supply circuit 11, a conductor 12, and a light emitting section 13.
  • the power supply circuit 11 supplies electrical energy to the light emitting section 13 through the conductor 12 .
  • the light-emitting portion 13 includes the above-described solid-state light-emitting element 3 and phosphors (first phosphor 1 and second phosphor 2).
  • the light emitting unit 13 then converts electrical energy into optical energy. That is, the light emitting unit 13 converts at least part of the electrical energy supplied from the power supply circuit 11 into light energy that becomes the output light 4 and outputs the output light 4 .
  • the electronic device 20 further includes a first detector 171, a second detector 172, a third detector 171A, and a fourth detector 172A.
  • the first detector 171 and the third detector 171A detect the near-infrared light component used for the main purpose.
  • a second detector 172 and a fourth detector 172A detect visible light components that are used for ancillary purposes.
  • the first detector 171 detects the near-infrared transmitted light component 15 in the output light 4 emitted from the light emitting unit 13 and applied to the object 14 to be irradiated.
  • a second detector 172 detects the visible transmitted light component 15 in the output light 4 with which the object 14 is irradiated.
  • the third detector 171A detects the near-infrared reflected light component 16 in the output light 4 with which the object 14 is irradiated.
  • the fourth detector 172A detects the visible reflected light component 16 in the output light 4 with which the object 14 is irradiated.
  • either the transmitted light component 15 transmitted through the object to be irradiated 14 or the reflected light component 16 reflected by the object to be irradiated 14 is obtained by any combination of the following (1) to (4). detectable. Therefore, the characteristic information of the object to be irradiated 14 related to the near-infrared and visible light components can be detected with compound eyes.
  • (1) Combination of first detector 171 and second detector 172 (2) Combination of first detector 171 and fourth detector 172A (3) Third detector 171A and second detection Combination of detector 172 (4) Combination of third detector 171A and fourth detector 172A
  • the electronic device of this embodiment includes the light emitting device 10 that emits the output light 4 including visible light and near-infrared light, a visible light detector, and a near-infrared light detector. . Therefore, the electronic device becomes a detection device with high accuracy, high sensitivity, miniaturization, and high efficiency.
  • the light emitting device 10 can be configured so that the energy of the output light 4 is large and illuminates a wide range. Therefore, even if the object 14 is irradiated with the output light 4 from a distant distance, a signal with a good S/N ratio (signal/noise ratio) can be detected. Therefore, the electronic equipment is suitable for inspection of a large irradiated object 14, batch inspection of objects distributed over a wide range, detection of objects existing in a part of a wide inspection area, detection of people or objects from a distance, and the like. .
  • the area of the main light extraction surface of the light emitting portion 13 can be 1 cm 2 or more and less than 1 m 2 , preferably 10 cm 2 or more and less than 1000 cm 2 .
  • the shortest distance from the light emitting unit 13 to the irradiated object 14 can be 1 mm or more and less than 10 m.
  • the shortest distance from the light emitting unit 13 to the object 14 to be irradiated is 1 mm or more and less than 30 cm.
  • the shortest distance from the light emitting unit 13 to the object to be irradiated 14 can be 30 cm or more and less than 10 m, preferably 1 m or more and less than 5 m.
  • the light-emitting unit 13 is movable, and more preferable that it can be freely moved depending on the shape of the object to be irradiated.
  • the light-emitting unit 13 may have a structure that can travel on a straight line or a curve, a structure that can scan in the XY-axis direction or the XYZ-axis direction, or a structure that is attached to a moving body (a flying body such as an automobile, a bicycle, or a drone). can do.
  • various photodetectors can be used for the first detector 171, the second detector 172, the third detector 171A, and the fourth detector 172A.
  • quantum-type photodetectors photodiodes, phototransistors, photo ICs, CCD image sensors, CMOS image sensor, etc.
  • a thermal photodetector thermal photodetector (thermopile using thermoelectric effect, pyroelectric detector using pyroelectric electronic devices), or infrared films sensitive to light can also be used.
  • a single element using a single photoelectric conversion element may be used.
  • the form of the imaging element may be a linear one-dimensional arrangement or a two-dimensional planar arrangement. Imaging cameras can also be used as these detectors.
  • the electronic device of this embodiment is preferably an inspection device, a detection device, a monitoring device, or a sorting device for an irradiated object that uses the output light 4 including near-infrared light.
  • the near-infrared light component of the output light 4 has the property of penetrating most substances. Therefore, by irradiating near-infrared light from the outside of the irradiated object and detecting the transmitted light or reflected light, the internal state and the presence or absence of foreign matter can be detected without destroying the irradiated object. can be inspected.
  • near-infrared light components are invisible to the human eye, and their reflection characteristics depend on the material. Therefore, by irradiating an object to be irradiated with near-infrared light and detecting the reflected light, the object to be irradiated can be detected even in the dark without being noticed by people.
  • the electronic device can inspect the internal state and the presence of foreign matter, judge the quality of the irradiated object, and sort out good products from defective products. Therefore, when the electronic device is further provided with a mechanism for distinguishing between normal irradiation objects and abnormal irradiation objects, it is possible to separate the irradiation objects.
  • the light-emitting device can be fixed rather than movable. With this configuration, it is not necessary to provide a complicated mechanism for mechanically moving the light-emitting device, so that the electronic device is less likely to fail.
  • by fixing the light-emitting device indoors or outdoors it is possible to observe the state of people and things at a predetermined place and count the number of people and things. Therefore, it is an electronic device that is advantageous for collecting big data that is useful for problem discovery and business utilization.
  • store lighting, indoor lighting, street lighting, and lighting devices for surgical operations can be cited as examples of stationary electronic devices equipped with light-emitting devices.
  • the electronic device has a movable light-emitting device, and it is also possible to change the irradiation location.
  • the light emitting device can be attached to a moving stage or a moving object (vehicle, flying object, etc.) to make it movable.
  • the light-emitting device can illuminate a desired place and a wide range, so that the electronic equipment is advantageous for inspection of large objects and inspection of the condition of objects outdoors.
  • a drone can be given as an example of a movable electronic device equipped with a light emitting device.
  • the electronic device can be configured to include a hyperspectral camera as an imaging camera in addition to the light emitting device. This allows the electronic device to perform hyperspectral imaging. Electronic devices equipped with hyperspectral cameras can distinguish differences in images that cannot be distinguished with the naked eye or ordinary cameras, making them useful inspection devices in a wide range of fields related to product inspection and sorting.
  • the electronic device 20A includes a light emitting device 10 and a hyperspectral camera 21.
  • the object 23 placed on the surface 22 a of the conveyor 22 is irradiated with output light from the light emitting device 10 while the object 23 is imaged by the hyperspectral camera 21 .
  • the object to be irradiated 23 can be inspected and sorted.
  • the electronic device should also preferably be equipped with a machine learning data processing system. This will allow the computer to iteratively learn from the data it receives and discover hidden patterns in it. Also, it becomes possible to apply newly acquired data to the pattern. Therefore, it is an electronic device that is advantageous for automating inspection, detection, monitoring, etc., improving accuracy, and predicting the future using big data.
  • Electronic devices can also be used for inspection of pharmaceuticals, animal experiments, foods, beverages, agricultural, forestry and fishery products, livestock products, and industrial products.
  • the electronic device of this embodiment can be used for any of the human body, animals and plants, and objects, and can also be used for any of gases, liquids, and solids.
  • Electronic devices can be any of medical devices, therapeutic devices, beauty devices, health devices, care-related devices, analytical devices, measuring devices, and evaluation devices.
  • the electronic device of the present embodiment can be used for 1) blood/body fluids/components thereof, 2) excrement (urine/feces), 3) proteins/amino acids, 4) cells ( cells), 5) genes/chromosomes/nucleic acids, 6) biological samples/bacteria/specimens/antibodies, 7) biological tissues/organs/blood vessels, 8) skin diseases/alopecia, examination, detection, measurement, evaluation, and analysis of , analysis, observation, monitoring, isolation, diagnosis, treatment, purification, etc.
  • the electronic device of the present embodiment can be used for 1) skin, 2) hair/body hair, 3) mouth/endodontics/periodontal, 4) ear/nose, 5) vital signs. , inspection, detection, measurement, evaluation, analysis, analysis, observation, monitoring, beautification, hygiene, growth promotion, diagnosis, etc.
  • the electronic device of the present embodiment includes 1) industrial products (electronic members and electronic devices), 2) agricultural products (fruits and vegetables, etc.), 3) enzymes and bacteria, and 4) Marine products (fish, shellfish, crustaceans, molluscs), 5) Pharmaceuticals and biological samples, 6) Foods and beverages, 7) Presence and state of humans, animals and objects, 8) State of gas (water vapor), 9) Liquids ⁇ Fluid/Water/Moisture/Humidity 10) Shape/Color/Internal Structure/Physical State of Objects 11) Space/Position/Distance 12) Contamination State of Objects 13) State of Molecules/Particles 14) Industrial Waste It can be used for inspecting, detecting, measuring, measuring, evaluating, analyzing, analyzing, observing, monitoring, recognizing, sorting, sorting, etc.
  • electronic devices can be used for checking excretion and identifying, managing, and monitoring health conditions.
  • the electronic device of this embodiment can be used for inspection, detection, measurement, measurement, evaluation, analysis, analysis, observation, monitoring, recognition, sorting, sorting, and so on.
  • this embodiment can also be regarded as a simple method invention of any one of an inspection method, a detection method, a monitoring method, a classification method, an analysis method, a measurement method, and an evaluation method using the light emitting device 10 .
  • Example 1 First, a first wavelength-converting light-emitting device composed of a solid-state light-emitting device 3 emitting primary light 3B of blue light (peak wavelength: 400 to 455 nm) and a first wavelength converter 1A was fabricated.
  • the first wavelength converter 1A includes a Y3Al2 ( AlO4 ) 3 : Ce3 + phosphor (YAG phosphor) and a (Sr, Ca) AlSiN3 :Eu2 + phosphor (SCASN phosphor).
  • YAG phosphor and SCASN phosphor were prepared as phosphor powders.
  • a YAG phosphor manufactured by Tokyo Kagaku Kenkyusho Co., Ltd. and having a median particle size D50 of about 24 ⁇ m was used.
  • This YAG phosphor had a fluorescence peak near a wavelength of 540 nm and emitted yellowish green light.
  • the SCASN phosphor manufactured by Mitsubishi Chemical Corporation and having a median particle size D50 of about 14 ⁇ m was used.
  • This SCASN phosphor had a fluorescence peak near a wavelength of 625 nm and emitted red light.
  • a two-liquid mixed thermosetting silicone resin manufactured by Shin-Etsu Chemical Co., Ltd., product name: KER-2500A/B was prepared as a sealant for the phosphor powder.
  • the YAG phosphor (2.352 g), the SCASN phosphor (0.504 g), and the silicone resin (0.75 g of agent A, 0.75 g of agent B) were mixed using a stirring and defoaming device, Further defoaming was performed.
  • the stirring and defoaming device was manufactured by Thinky Co., Ltd., product name: Awatori Mixer (registered trademark), type: ARE-310. Further, the rotational speed of the stirring/defoaming device was about 2000 rpm, and the treatment was carried out for 3 minutes. In this way, a phosphor paste composed of the YAG phosphor, the SCASN phosphor, and the silicone resin was produced.
  • the phosphor paste thus obtained was dropped into a frame with a height of about 210 ⁇ m provided around the blue LED chip. Then, the phosphor paste was cured by heating in the air at 150° C. for 2 hours.
  • the first wavelength conversion body 1A length 5 mm, width 5 mm, thickness about 200 ⁇ m
  • the first wavelength A conversion-type light-emitting device was used.
  • a second wavelength-converting light-emitting device composed of the solid-state light-emitting device 3 and the second wavelength conversion body 2A was produced.
  • a blue LED chip was used for the solid-state light-emitting device 3 as in the first wavelength-converting light-emitting device.
  • the second wavelength converter 2A was a resin phosphor film containing a phosphor mainly composed of a composite metal oxide activated with Cr 3+ and having a fluorescence peak near a wavelength of 750 nm.
  • This phosphor is represented by the composition formula (Gd 0.95 La 0.05 ) 3 (Ga 0.97 Cr 0.03 ) 2 (GaO 4 ) 3 (Gd, La) 3 Ga 2 ( GaO 4 ) 3 : It is a Cr 3+ phosphor (GLGG phosphor) and has a garnet-type crystal structure.
  • the GLGG phosphor was prepared by an orthodox solid phase reaction using the following compound powder as a main raw material.
  • a compound (Gd 0.95 La 0.05 ) 3 (Ga 0.97 Cr 0.03 ) 2 (GaO 4 ) 3 ) having a stoichiometric composition is produced by a chemical reaction.
  • Table 1 shows the weighed values of the raw materials.
  • a sieve was used to remove the alumina balls to obtain a slurry-like mixed raw material consisting of the raw material and ethanol. After that, the mixed raw material was dried at 125° C. using a dryer. The dried mixed raw material was lightly mixed with a mortar and pestle to obtain a phosphor raw material.
  • the phosphor raw material was placed in an alumina sintering container (material SSA-H, B3 size, with lid), and was sintered in the air at 1500°C for 2 hours using a box-type electric furnace. Note that the temperature rising/falling rate during firing was set to 300° C./h.
  • the obtained fired product was manually pulverized using an alumina mortar and pestle, and then passed through a nylon mesh (95 ⁇ m opening) to remove coarse particles to obtain a powdery GLGG phosphor. .
  • the crystal structure of the obtained GLGG phosphor was evaluated using an X-ray diffraction device (desktop X-ray diffraction device, MiniFlex, manufactured by Rigaku Corporation). was a compound. Furthermore, the particle shape and particle size of the GLGG phosphor were evaluated using an electron microscope (desktop microscope Miniscope (registered trademark) TM4000, manufactured by Hitachi High-Technologies Corporation). As a result, the particle shape of the GLGG phosphor was a monodisperse particle shape, the particle shape could be considered to be derived from garnet crystals, and the particle size was mainly around 15 ⁇ m.
  • the fluorescence properties of the GLGG phosphor were evaluated using an absolute PL quantum yield measurement device (C9920-02, manufactured by Hamamatsu Photonics Co., Ltd.) under irradiation with blue light having a wavelength of 450 nm.
  • the fluorescence peak wavelength was 747 nm
  • the internal quantum efficiency (IQE) was 92%
  • the blue light absorption rate (Abs.) was 57%.
  • the fluorescence peak wavelength was 746 nm
  • the internal quantum efficiency (IQE) was 93%
  • the light absorption rate (Abs.) of red light was 45%.
  • a second wavelength converter 2A (5 mm long, 5 mm wide, thickness: 310 ⁇ m) and a second wavelength converter 2A were obtained in the same manner as the first wavelength converter 1A.
  • Two wavelength conversion type light emitting devices were fabricated.
  • a first wavelength-converting light-emitting element composed of a blue LED and a first wavelength converting body 1A, and a second wavelength-converting light-emitting element composed of a blue LED and a second wavelength converting body 2A was used to fabricate a light-emitting device as shown in FIG.
  • the emission characteristics of the obtained light-emitting device were evaluated. First, when a current of 500 mA was passed through the blue LED chip of the first wavelength conversion type light emitting element, blue light was emitted as the primary light 3B from the blue LED chip. Further, part of it was converted by the first wavelength converter 1A into visible light as the first wavelength-converted light 1B (orange light obtained by additive color mixture of weak green light component and strong red light component). A first mixed light composed of blue light as the primary light 3B and visible light as the first wavelength-converted light 1B was emitted from the first wavelength-converted light-emitting element. Partly because the output ratio of the blue light component was small, the appearance of the mixed light was substantially orange light, and the light had a color tone that could not be regarded as white light.
  • the mixed light composed of the primary light 3B, the first wavelength-converted light 1B, and the second wavelength-converted light 2B is output light 4 released as.
  • the spectral distribution shown in FIG. 1 is the spectral distribution of the output light 4 emitted from the light emitting device of this example.
  • the spectral distribution of the output light 4 consists of a first light component 5 originating from the first wavelength-converted light 1B and a second light component 6 originating from the second wavelength-converted light 2B. , and a third light component 7 derived from the primary light 3B.
  • the spectral distribution has peaks in a blue wavelength range of 440 nm to less than 470 nm, a red wavelength range of 600 nm to less than 650 nm, and a deep red to near-infrared wavelength range of 700 nm to less than 800 nm. Therefore, the output light 4 had a multimodal (three-modal) broad spectral distribution having light components over a wide wavelength range from at least 410 nm to 950 nm.
  • the spectral distribution of the output light 4 has a first minimum 8 between the first light component 5 and the second light component 6, and the intensity maximum of the second light component 6 is the first light Greater than the intensity maximum of component 5. Furthermore, the first minimum 8 was below 50% of the intensity maximum of the second light component 6, specifically 37% (less than 40%).
  • the first light component 5 had a fluorescence peak at a wavelength of 618 nm, and the 60% width of the spectral distribution was 80 nm (70 nm or more and less than 90 nm).
  • the "60% width” is the wavelength difference between the wavelengths (the short wavelength side and the long wavelength side) at which the fluorescence peak intensity becomes 60%.
  • the second light component 6 had a fluorescence peak at 747 nm, and the 50% width of the spectral distribution was 118 nm (110 nm or more and less than 125 nm).
  • the "50% width” is the wavelength difference between the wavelengths (the short wavelength side and the long wavelength side) at which the fluorescence peak intensity becomes 50%.
  • the third light component 7 had a fluorescence peak at 455 nm and a half width of 27 nm (25 nm or more and less than 30 nm).
  • the third light component 7 having a wavelength of 400 nm or more and less than 500 nm, the first light component 5 having a wavelength of 510 nm or more and less than 670 nm, and the second light component 6 having a wavelength of 680 nm or more and less than 1050 nm are all unimodal. there were.
  • the correlated color temperature is 2299 K
  • the duv indicating the deviation from the black body radiation is -97.0
  • the average The color rendering index Ra was 37.
  • the reason why the general color rendering index (Ra) is low is that the maximum spectral intensity in the wavelength range of green from 500 nm to less than 550 nm is less than 15% (11%) of the maximum intensity of the second light component. It can be considered that it is due to small things.
  • Example 2 to 4 The light emitting devices of Examples 2 to 4 had the structure shown in FIG. Then, for simplification, a white LED for LED lighting that is a combination of a blue LED (fluorescence peak wavelength: 450 to 455 nm) and a phosphor is used, and the white LED and the second wavelength conversion body 2A are combined. By combining them, the light-emitting device of this example was obtained.
  • the phosphor used in the white LED can be assumed to be a mixed phosphor of a Ce 3+ -activated garnet green phosphor and an Eu 2+ -activated nitride red phosphor from the spectral distribution of the light emitted by the white LED. .
  • white LEDs 1 to 3 manufactured by Lumileds
  • Table 2 three types of white LEDs (white LEDs 1 to 3: manufactured by Lumileds) shown in Table 2 were prepared.
  • a rated current was applied to the white LEDs to light them.
  • the output light is integrated with an integrating sphere ( ⁇ 20 inches, product number: LMS-200, manufactured by Labsphere), and the output light 4 is measured using a total luminous flux measurement system (product number: SLMS-CDS-2021, manufactured by Labsphere). Spectral distribution and radiant flux were measured.
  • a resin phosphor film (thickness: 340 ⁇ m) produced using a GLGG phosphor was used for the second wavelength converter 2A.
  • 2 A of 2nd wavelength converters were produced as follows.
  • the above-described GLGG phosphor (4.57 g) was prepared as phosphor powder.
  • the two-liquid mixing type thermosetting silicone resin (0.75 g of agent A and 0.75 g of agent B) was prepared as a sealant for the phosphor powder. Then, these materials were mixed and defoamed in the same manner as in Example 1 to prepare a phosphor paste composed of the GLGG phosphor and the silicone resin.
  • the phosphor paste obtained in this manner was dropped onto a form provided on a glass substrate (200 mm long, 200 mm wide, 1 mm thick). After that, a squeegee was used to flatten the surface of the dropped phosphor paste. A phosphor sheet was produced by removing the formwork and curing by heating in the air at 150° C. for 2 hours. Then, the phosphor sheet was peeled off from the glass substrate using tweezers to obtain a second wavelength converter 2A (length 50 mm, width 60 mm, thickness 340 ⁇ m).
  • FIG. 8 collectively shows the spectral distributions of the output light of the light emitting devices of Examples 2 to 4.
  • the output light includes a light component (third light component) having a peak around a wavelength of 450 nm, a fluorescence component (first light component) having a maximum intensity at a wavelength of 560 to 600 nm, and a wavelength of 730 to 750 nm. and a fluorescent component (second light component) having the maximum intensity at .
  • the third light component is the light component originating from the blue LED.
  • the first light component is a light component derived from a mixed phosphor of a green phosphor (Ce 3+ activated garnet phosphor) and a red phosphor (Eu 2+ activated nitride phosphor).
  • the second light component is a fluorescent component derived from a near-infrared phosphor (Cr 3+ activated garnet phosphor).
  • Each spectral distribution has a first minimum value between the first light component and the second light component, and the intensity maximum value of the second light component is greater than the intensity maximum value of the first light component. is also big. Furthermore, the first minimum is below 50% of the intensity maximum of the second light component, specifically 24.4% (Example 2), 37.1% (Example 3). , 37.3% (Example 4). In addition, the maximum intensity value of the third light component is small, being less than 20% of the maximum intensity value of the second light component, specifically 18.1% (Example 2) and 6.2%. (Example 3) and 10.7% (Example 4).
  • this embodiment is a light-emitting device that is advantageous for applications that require output light containing a green to yellow light component and a strong near-infrared light component.
  • the data is omitted for convenience of explanation, when the white light emitted by the white LED is transmitted through the second wavelength conversion body 2A, the blue light component and the red light component in the light components emitted by the white LED strength tended to decrease significantly. This is probably because the Cr 3+ -activated phosphor contained in the second wavelength converter 2A has the property of absorbing blue and red light components. Due to this, the output light tends to be yellowish. Therefore, in order to obtain output light close to white light, it is possible to adopt a structure in which part of the light from the white LED (wavelength conversion type light emitting device) does not pass through the second wavelength conversion body 2A but passes through as it is. preferable.
  • Table 3 summarizes the characteristics of the output light of Examples 2-4.
  • the output light of Examples 2 to 4 had a correlated color temperature of 2500 K or more and less than 4500 K and a duv of +10 or more and less than +50 (20 or more and less than 40).
  • the general color rendering index (Ra) was 50 or more and less than 80.
  • the correlated color temperature was hardly changed even after the white light emitted by the white LED was transmitted through the second wavelength converter 2A.
  • the average color rendering index (Ra) was 75, showing a relatively high color rendering property and maintaining a relatively high radiant flux.
  • Examples 2 to 4 are also advantageous light emitting devices for obtaining output light that emits both high-power near-infrared rays and visible light.
  • Examples 5 to 8 The light-emitting devices of Examples 5-8 also had the structure shown in FIG. 2, similarly to Examples 2-4. However, a commercially available blue LED (fluorescence peak wavelength: 460 nm, product number: PT-121-B-L11-EPG, manufactured by Luminus Devices) was used as the blue LED.
  • the phosphors used were a Ce 3+ -activated garnet phosphor (LuCaMG phosphor) which is represented by the general formula of Lu 2 CaMg 2 (SiO 4 ) 3 :Ce 3+ and emits orange light, and the GLGG phosphor described above.
  • the LuCaMG phosphor was produced according to the example of WO2018/230207.
  • the LuCaMG phosphor is a phosphor particle group having a primary particle diameter of about 3 to 15 ⁇ m, which absorbs blue light and converts it into orange light (fluorescence peak wavelength: about 596 nm).
  • a first phosphor sheet which is a resin phosphor film containing LuCaMG phosphor
  • a second phosphor sheet which is a resin phosphor film containing GLGG phosphor
  • the thermosetting silicone resin and the phosphor are kneaded so that the filling rate of the phosphor in the resin is 30 vol %, and the phosphor is thermally cured to form the first phosphor sheet and the second phosphor.
  • a sheet was produced.
  • the thickness of the first phosphor sheet was 97 ⁇ m
  • the thickness of the second phosphor sheet was 100 ⁇ m, 193 ⁇ m, and 270 ⁇ m.
  • the thickness of the phosphor sheet was adjusted by using molds with different thicknesses.
  • the wavelength converter different from the "wavelength converter emitting the output light 4" in Table 4 is the primary light 3B. is the wavelength converter on the incident side, that is, on the blue LED side.
  • a wavelength conversion body having a two-layer structure was placed on the light output surface of the blue LED, and a current of 300 mA was passed through the blue LED to light it. After that, the spectral distribution of the output light, the radiant flux, and the like were measured in the same manner as in Examples 1-4.
  • FIG. 9 collectively shows the spectral distribution of the output light of the light emitting devices of Examples 5-8.
  • the spectral distributions of the output lights of Examples 5 to 8 are also similar to the spectral distributions of FIG. 8, and have light components within at least the entire wavelength range from 420 nm to less than 950 nm.
  • the output light includes a light component (third light component) having a peak around a wavelength of 460 nm, a fluorescence component (first light component) having a maximum intensity at a wavelength of 560 to 600 nm, and a wavelength of 720 to 750 nm. and a fluorescent component (second light component) having the maximum intensity at .
  • the third light component is the light component originating from the blue LED.
  • the first light component is a fluorescence component derived from an orange phosphor (Ce 3+ activated garnet phosphor; LuCaMG).
  • the second light component is a fluorescence component derived from a near-infrared phosphor (Cr 3+ -activated garnet phosphor; GLGG).
  • Each spectral distribution has a first minimum value between the first light component and the second light component, and the maximum intensity value of the second light component is the maximum intensity value of the first light component. bigger than Furthermore, the first minimum is below 50% of the intensity maximum of the second light component, specifically 44.2% (Example 5), 22.5% (Example 6). , 12.9% (Example 7) and 47.5% (Example 8). Further, the maximum intensity value of the third light component 7 is small, being less than 70% of the maximum intensity value of the second light component 6, specifically 67.8% (Example 5), 35.0%. 6% (Example 6), 26.4% (Example 7), and 28.9% (Example 8).
  • this embodiment is also a light-emitting device that is advantageous for applications that require output light containing a green to yellow light component and a strong near-infrared light component.
  • Table 5 summarizes the characteristics of the output light of Examples 5-8.
  • the output light of Examples 5 to 8 had a correlated color temperature of 1800 K or more and less than 3000 K and a duv of -25 or more and less than 15.
  • the general color rendering index (Ra) was a numerical value of 55 or more and less than 80.
  • the output light emitted by the light emitting device of Example 8 was light of a light color considered to be white light.
  • Examples 5 to 8 are also advantageous light-emitting devices for obtaining high output light emitting both near-infrared light and visible light.
  • the spectral distribution of the wavelength conversion type light emitting element includes the LED used, the color tone of the fluorescence emitted by the phosphor (fluorescence peak wavelength), the wavelength converter containing the phosphor (the first wavelength converter 1A and the second wavelength converter It changes depending on the light absorption rate of the body 2A). Further, the light absorption rate of the wavelength converter depends on the volume ratio of the phosphor in the wavelength converter, the thickness of the wavelength converter, the activation amount of fluorescent ions in the phosphor, the composition of the base compound, and the particle size. Change. Blue LEDs, white LEDs, and phosphors other than those used in this embodiment are commercially available that emit light in a wide variety of colors. Therefore, the correlated color temperature and color rendering properties of the output light are not limited to the present embodiment.
  • a light-emitting device that is advantageous in increasing the output of visible light components and near-infrared light components of specific wavelengths, and an electronic device using the light-emitting device.

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PCT/JP2022/005458 2021-02-22 2022-02-10 発光装置及びそれを用いた電子機器 Ceased WO2022176782A1 (ja)

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EP22756102.4A EP4296333A4 (en) 2021-02-22 2022-02-10 Light-emitting device and electronic apparatus using same
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024157721A1 (ja) * 2023-01-27 2024-08-02 パナソニックＩｐマネジメント株式会社 近赤外線発光装置、分光装置、及び、分光法
JP7610059B1 (ja) 2024-04-25 2025-01-07 株式会社Maruwa Ｌｅｄ発光装置、照明器具及び測定用光源
WO2026008394A1 (en) * 2024-07-04 2026-01-08 Signify Holding B.V. Efficient low blue solution led spectrum with sufficient cri

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018207703A1 (ja) * 2017-05-11 2018-11-15 三菱ケミカル株式会社 発光装置、および蛍光体
WO2018230207A1 (ja) 2017-06-15 2018-12-20 パナソニックＩｐマネジメント株式会社 ガーネット珪酸塩、ガーネット珪酸塩蛍光体、並びにガーネット珪酸塩蛍光体を用いた波長変換体及び発光装置
JP2019204831A (ja) 2018-05-22 2019-11-28 ウシオオプトセミコンダクター株式会社 発光素子
CN111442198A (zh) * 2020-03-30 2020-07-24 旭宇光电（深圳）股份有限公司 全光谱发光系统
JP2021026804A (ja) 2019-07-31 2021-02-22 アイシン精機株式会社 車両用操作検出装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9206958B2 (en) * 2013-09-16 2015-12-08 Osram Sylvania Inc. Thin film wavelength converters and methods for making the same
CN113711449B (zh) * 2019-04-24 2025-02-18 松下知识产权经营株式会社 波长转换体以及使用了该波长转换体的发光装置、医疗系统、电子设备及检验方法
KR102193591B1 (ko) * 2019-05-15 2020-12-21 주식회사 올릭스 광대역 발광 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018207703A1 (ja) * 2017-05-11 2018-11-15 三菱ケミカル株式会社 発光装置、および蛍光体
WO2018230207A1 (ja) 2017-06-15 2018-12-20 パナソニックＩｐマネジメント株式会社 ガーネット珪酸塩、ガーネット珪酸塩蛍光体、並びにガーネット珪酸塩蛍光体を用いた波長変換体及び発光装置
JP2019204831A (ja) 2018-05-22 2019-11-28 ウシオオプトセミコンダクター株式会社 発光素子
JP2021026804A (ja) 2019-07-31 2021-02-22 アイシン精機株式会社 車両用操作検出装置
CN111442198A (zh) * 2020-03-30 2020-07-24 旭宇光电（深圳）股份有限公司 全光谱发光系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4296333A4

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024157721A1 (ja) * 2023-01-27 2024-08-02 パナソニックＩｐマネジメント株式会社 近赤外線発光装置、分光装置、及び、分光法
JP7610059B1 (ja) 2024-04-25 2025-01-07 株式会社Maruwa Ｌｅｄ発光装置、照明器具及び測定用光源
JP2025167142A (ja) * 2024-04-25 2025-11-07 株式会社Maruwa Ｌｅｄ発光装置、照明器具及び測定用光源
WO2026008394A1 (en) * 2024-07-04 2026-01-08 Signify Holding B.V. Efficient low blue solution led spectrum with sufficient cri

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