WO2021111724A1 - 波長変換素子、波長変換装置および発光システム - Google Patents

波長変換素子、波長変換装置および発光システム Download PDF

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Publication number
WO2021111724A1
WO2021111724A1 PCT/JP2020/037834 JP2020037834W WO2021111724A1 WO 2021111724 A1 WO2021111724 A1 WO 2021111724A1 JP 2020037834 W JP2020037834 W JP 2020037834W WO 2021111724 A1 WO2021111724 A1 WO 2021111724A1
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Prior art keywords
wavelength conversion
light emitting
conversion element
fluorescence
light
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PCT/JP2020/037834
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English (en)
French (fr)
Japanese (ja)
Inventor
透 菅野
青森　繁
英臣 由井
智子 植木
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Sharp Corp
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Sharp Corp
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Priority to US17/782,087 priority Critical patent/US20230003994A1/en
Priority to JP2021562476A priority patent/JPWO2021111724A1/ja
Priority to CN202080084055.9A priority patent/CN114766009A/zh
Publication of WO2021111724A1 publication Critical patent/WO2021111724A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16—Laser light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence

Definitions

  • the present disclosure relates to a wavelength conversion element, a wavelength conversion device, and a light emitting system.
  • This disclosure claims priority based on Japanese Patent Application No. 2019-219630 filed in Japan on December 4, 2019, the contents of which are incorporated herein by reference.
  • Patent Document 1 describes a wavelength conversion element provided with an antireflection portion in which phosphor particles are dispersed in a translucent medium, and a wavelength conversion element having a fine concavo-convex structure on the surface of the phosphor particles. Is described.
  • Patent Document 2 describes a phosphor layer composition
  • FIG. 2 is a cross-sectional view schematically showing a wavelength conversion element of a related technique composed of a fluorescent film in which phosphor particles 2 are dispersed in a binder 1.
  • FIG. 9 is an SEM image of a cross section of the wavelength conversion element of the related technology.
  • the wavelength conversion element of the related technique is generally manufactured by drying a composition containing the binder 1 and the phosphor particles 2 by firing or the like.
  • the wavelength conversion element of the related technology has a plurality of voids 4 inside in addition to the binder 1 and the phosphor particles 2 because cracks are generated during firing in the manufacturing process thereof. including.
  • These voids 4 reduce the thermal conductivity of the wavelength conversion element by blocking the heat conduction X inside the wavelength conversion element. Therefore, in the wavelength conversion element of the related technology, even if phosphor particles capable of emitting high-intensity light by irradiation with excitation light are used, the temperature of the wavelength conversion element tends to be high, and the luminous efficiency of the phosphor particles is lowered. Therefore, there is a problem that the desired fluorescence emission intensity cannot be obtained.
  • the wavelength conversion element described in Patent Document 1 improves the efficiency of incident light of excitation light on the phosphor particles and the efficiency of extracting the generated fluorescence by providing a fine concavo-convex structure on the surface of the phosphor particles. It is something to try. However, there are voids inside the wavelength conversion element. In addition, bubbles may be generated when the gaps of the nano-sized fine structure provided on the surface of the phosphor particles are filled with a translucent medium such as silicone resin or glass. Therefore, the thermal conductivity is low due to the presence of voids and bubbles, and the luminous efficiency of the phosphor particles tends to decrease.
  • Patent Document 2 The phosphor layer composition described in Patent Document 2 is intended to suppress reflection at the interface between the phosphor particles and the binder to improve the excitation light absorption of the phosphor particles and the extraction efficiency of the generated fluorescence. .. Patent Document 2 does not disclose the voids generated by firing or the like, and there still exists a problem of a decrease in thermal conductivity due to the presence of the voids.
  • the present disclosure has been made in view of the above problems, and an object thereof is to provide a wavelength conversion element having excellent thermal conductivity and high luminous efficiency.
  • the wavelength conversion element includes a binder and a plurality of phosphor particles dispersed in the binder and receiving excitation light to emit light in a predetermined wavelength band. And a plurality of voids dispersed in the binder, and at least a part of the voids is provided with a first coating film formed of a metal alkoxide on at least a part of the inner wall. It is a feature.
  • FIG. 1 is a cross-sectional view schematically showing the wavelength conversion element 10 according to the present embodiment.
  • FIG. 7 is an SEM image (magnification of 5000 times) of a cross section obtained by dividing the wavelength conversion element 10 according to the present embodiment by a cross section polisher.
  • the wavelength conversion element 10 includes a binder 1 and a plurality of phosphor particles 2 dispersed in the binder 1 and receiving excitation light to emit light in a predetermined wavelength band.
  • a plurality of voids dispersed in the binder 1 are included, and at least a part of the plurality of voids includes a first coating film 3 formed of a metal alkoxide on at least a part of the inner wall.
  • the void provided with the first coating film 3 does not block the heat conduction X inside the wavelength conversion element by forming a heat conduction path, unlike the void 4 of the related technology having no coating film.
  • the thermal conductivity of the wavelength conversion element is increased, and even if the phosphor particles emit high-intensity light due to irradiation with excitation light, the generated heat is quickly released to the outside of the wavelength conversion element, resulting in high luminous efficiency. Increased fluorescence emission intensity can be achieved.
  • FIG. 15 is a graph showing the relationship between energy density and fluorescence brightness in the wavelength conversion element 10 (Embodiment 1) according to the present embodiment and the wavelength conversion element (comparative example) of the related technology.
  • the wavelength conversion element 10 according to the present embodiment which includes the first coating film 3 in the void, withstands a strong laser power (irradiation energy density) exceeding 60 W / mm 2 and 1. 4a. u. High fluorescence brightness in excess of can be achieved.
  • the wavelength conversion element of the related technology having the same configuration except that the coating film is not provided has a low luminous efficiency and a low fluorescence brightness due to the laser power of 40 W / mm 2.
  • FIG. 16 is a graph showing the relationship between the peak laser power density and the peak temperature in the wavelength conversion element 10 (Embodiment 1) according to the present embodiment and the wavelength conversion element (comparative example) of the related technology.
  • the wavelength conversion element 10 according to the present embodiment has a lower surface temperature than the wavelength conversion element of the related technology, and has lower thermal conductivity. Improved and high heat dissipation.
  • the binder 1 is not particularly limited, but a binder containing an inorganic compound can be preferably used in order to further enhance the heat resistance.
  • examples of such an inorganic compound include alumina, silica and zinc oxide, and alumina and zinc oxide are particularly preferable from the viewpoint of thermal conductivity.
  • a binder containing inorganic nanoparticles having an average primary particle diameter of about 1 to 1000 nm can be used as the binder 1.
  • examples of such inorganic nanoparticles include nanoparticles made of a metal or a metal compound, and among them, nanoparticles made of a metal oxide such as silica or alumina can be preferably used.
  • the shape of the inorganic nanoparticles is not particularly limited, and examples thereof include a spherical shape, an elliptical spherical shape, a fibrous shape, a lump shape, and a needle shape.
  • the diameter of the spherical body is taken as the particle diameter.
  • the diameter of the circumscribed sphere of the inorganic nanoparticles is taken as the particle diameter.
  • the average primary particle size of the inorganic nanoparticles is determined by observing the inorganic nanoparticles with an electron microscope and arithmetically averaging the particle sizes of 10 to 100 particles.
  • the phosphor particles 2 are not particularly limited, and known fluorescent particles can be used. However, from the viewpoint of material cost, manufacturing cost, and optical characteristics, garnet-based inorganic fluorescent particles using alumina as a base material are used. It is preferably used. Examples of the garnet-based inorganic phosphor particles include YAG: Ce (yellow luminescent phosphor) and LuAG: Ce (green luminescent phosphor). Garnet-based inorganic phosphor particles can emit high-intensity light by irradiation with high-intensity excitation light, but it is known that the luminous efficiency decreases when the temperature of the phosphor particles becomes high. However, since the wavelength conversion element of the present disclosure exhibits high thermal conductivity, it is possible to prevent the phosphor particles from becoming too hot and to prevent a decrease in luminous efficiency.
  • the first coating film 3 formed inside the void is a translucent film-like material formed from a metal alkoxide according to a known sol-gel method.
  • the metal alkoxide may be a mixture with a metal oxide.
  • the metal constituting the metal alkoxide and the metal oxide include silicon, aluminum, tin, zinc, zirconium and titanium.
  • aluminum alkoxide having alumina as a base material or a mixture of aluminum alkoxide and alumina can be particularly preferably used as in the case of the garnet-based inorganic phosphor particles.
  • the thermal conductivity and luminous efficiency of the wavelength conversion element can be improved. ..
  • the ratio of the total volume of the voids including the first coating film 3 to the total volume of the voids dispersed in the binder 1 is not particularly limited, but the higher the ratio, the more the thermal conductivity and the luminous efficiency.
  • first coating film 3 may be in contact with at least a part of the inner wall of the void so as to form a heat conduction path.
  • the wavelength conversion element 10 is a mixing step of mixing a binder solution to be a binder 1 and a phosphor particle 2 to prepare a phosphor ink composition, and a film-like product composed of the above-mentioned phosphor ink composition.
  • an inorganic nanoparticle sol can be preferably used as the binder solution.
  • the inorganic nanoparticle sol may contain inorganic nanoparticles, a solvent, and, if necessary, a stabilizer that keeps the inorganic nanoparticles dispersed.
  • the solvent is not particularly limited, and examples thereof include water, alcoholic solvents, and mixtures thereof. Examples of the alcohol solvent include ethanol, isopropyl alcohol and the like.
  • the mixing ratio of the binder solution and the phosphor particles 2 is not particularly limited, and can be appropriately set according to the desired fluorescence emission intensity and the like.
  • a known film-forming method can be used as a method for forming a film-like substance from the phosphor ink composition in the film-forming step of forming the film-like substance composed of the fluorescent ink composition.
  • a film-like substance can be formed by applying the fluorescent ink composition onto a substrate or the like.
  • the coating method conventional methods such as spray coating, inkjet coating, dispenser coating, screen printing, and dip method can be used.
  • the thickness of the film-like material is not particularly limited and can be appropriately set according to the desired thickness of the wavelength conversion element.
  • the firing step of obtaining a fired product containing a plurality of voids the solvent of the binder solution is removed, and the fired product in which the phosphor particles 2 are dispersed in the binder 1 is obtained. Due to the generation of cracks during firing, the fired product contains a plurality of voids.
  • the firing temperature and firing time are appropriately set according to the binder and the like used, and for example, firing is performed at 200 to 400 ° C. for 60 minutes.
  • the sol formed from the metal alkoxide used in the permeation step of permeating the sol formed from the metal alkoxide can be appropriately prepared by hydrolyzing the metal alkoxide according to a known sol-gel method.
  • a method for producing such a sol an example of a method for producing an alumina sol formed from aluminum alkoxide will be described below.
  • IPA isopropyl alcohol
  • Al (O-sec-Bu) 3 aluminum tri-sec-butoxide
  • EAcAc ethyl acetoacetate
  • Alumina sol can then be prepared by carefully dropping water (H 2 O) and IPA.
  • H 2 O water
  • the sol By infiltrating the sol formed from the metal alkoxide into the fired product obtained in the firing step, the sol enters into a plurality of voids in the fired product and fills the voids.
  • the permeation method is not particularly limited, and a conventional coating method such as spray coating, inkjet coating, dispenser coating, screen printing, and dip method can be used.
  • the sol is gelled by removing the solvent in the sol by drying or calcining, and a first coating is applied on the inner wall of at least a part of the voids.
  • the film 3 is formed.
  • the treatment temperature and treatment time for drying or firing are appropriately set according to the type and amount of the solvent used.
  • FIG. 1 is a cross-sectional view schematically showing the wavelength conversion element 20 according to the present embodiment.
  • FIG. 8 is an SEM image (magnification of 50,000 times) of a cross section obtained by dividing the wavelength conversion element 20 according to the present embodiment with a cross section polisher.
  • the first coating film 3 formed inside the void has a convex portion having a height of several tens to several hundreds of nm on the surface thereof. It differs from the wavelength conversion element 10 of the first embodiment in that it has a fine concavo-convex structure.
  • Each other configuration is the same as the configuration described in the first embodiment.
  • the first coating film 3 Since the first coating film 3 has an uneven structure on the surface, the difference in refractive index between the air in the void and the first coating film 3 is reduced, and the reflection at these interfaces is suppressed. As a result, the efficiency of extracting the fluorescence generated by the wavelength conversion element 20 is increased.
  • fluorescence extraction efficiency means "fluorescence intensity emitted from a wavelength conversion element" / "excitation light intensity”.
  • the uneven structure is more preferably a petal-like structure.
  • the petal-like structure is a fine plate-like structure in which each convex portion has a thickness of several tens of nm to several hundred nm, a height of several tens of nm to several hundred nm, and a length of several nm to several tens of nm. It refers to a concavo-convex structure in which these are oriented in random directions with each other.
  • the shape of each plate-shaped convex portion preferably has a height / length aspect ratio of more than 1. The larger the aspect ratio, the higher the surface reflection reduction effect.
  • the wavelength conversion element 20 includes a dipping step of immersing the wavelength conversion element 10 of the first embodiment in boiling water to perform a boiling treatment, and a second firing step of firing after the boiling treatment. It can be preferably produced depending on the production method.
  • the dipping step is performed by boiling the wavelength conversion element 10 for 10 to 30 minutes in warm water of about 60 to 100 ° C.
  • the first coating film 3 in the void becomes hydrate, and a fine uneven structure is formed on the surface of the first coating film 3.
  • the wavelength conversion element 10 after the boil treatment is fired at 100 to 200 ° C. for 60 minutes to perform drying.
  • the immersion step is performed to bring alumina water onto the surface of the first coating film 3.
  • Petal-like alumina Flowerlike aluminum
  • boehmite Al 2 O 3 , H 2 O
  • drying is performed by performing the second firing step.
  • boehmite may be converted to ⁇ -alumina by further firing at 400 to 500 ° C. to form alumina (oxide) petal-like alumina.
  • petal-like alumina is composed of alumina or alumina hydrate and forms a petal-like structure on the surface.
  • FIG. 3 is a cross-sectional view schematically showing the wavelength conversion element 30 according to the present embodiment.
  • the wavelength conversion element 30 has a fine concavo-convex structure in which the surface of the wavelength conversion element is formed of a metal alkoxide and the height of the convex portion is about several tens to several hundreds nm. It is different from the first embodiment and the second embodiment in that it is provided with the second coating film 5 having the above. Each of the other configurations is the same as the configuration described in the first and second embodiments.
  • the second coating film 5 is a translucent film-like material formed from a metal alkoxide according to a known sol-gel method, similarly to the first coating film 3 formed inside the voids. ..
  • the material of the second coating film 5 is the same as that described for the first coating film 3 in the first embodiment.
  • FIG. 10 is an SEM image in which the surface of the wavelength conversion element 30 according to the present embodiment is observed at a magnification of 2000 times using inorganic nanoparticles as a binder
  • FIG. 11 is an SEM image in which the surface is observed at a magnification of 100,000 times. It is an image.
  • FIG. 12 is an SEM image obtained by observing the surface of a wavelength conversion element of a related technology that uses inorganic nanoparticles as a binder and does not have a second coating film 5 on the surface at a magnification of 2000 times.
  • Reference numeral 13 denotes an SEM image obtained by observing the same surface at a magnification of 100,000 times.
  • the surface of the wavelength conversion element of the related technology which uses inorganic nanoparticles as a binder and does not have a second coating film 5 on the surface, has an exposed structure in which nanoparticles of several nm to several tens of nm are aggregated. ..
  • the second coating film 5 has a fine uneven structure on its surface, and as shown in FIGS. 10 and 11, it is particularly preferable to have a petal-like structure.
  • the surface of the wavelength conversion element 30 With a second coating film 5 formed of metal alkoxide and having a concavo-convex structure on the surface, the difference in refractive index between air and the wavelength conversion element 30 is reduced, and the interface between them is reduced. Reflection is suppressed. As a result, the excitation light incident efficiency and the fluorescence extraction efficiency between the air and the wavelength conversion element 30 are increased, and the luminous efficiency can be further improved.
  • the second coating film 5 may be formed on the surface of at least a part of the wavelength conversion element 30.
  • the ratio of the area where the second coating film 5 is formed to the total surface area of the wavelength conversion element 30 is not particularly limited, but the higher the ratio, the higher the reflection reduction effect. Therefore, it is particularly preferable that the second coating film 5 is formed on the entire surface of the wavelength conversion element 30 that forms an interface with air.
  • the wavelength conversion element 30 according to the present embodiment is the manufacturing method of the first embodiment, except that when the sol formed from the metal alkoxide is permeated into the fired product in the permeation step, the sol is also applied to the surface of the fired product.
  • the wavelength conversion element manufactured according to the above can be manufactured by subjecting it to a dipping step and a second firing step according to the manufacturing method of the second embodiment.
  • a coating method for applying a sol formed of a metal alkoxide to the surface of a fired product a conventional method such as spray coating, inkjet coating, dispenser coating, screen printing, or dip method can be used.
  • the amount of sol applied is not particularly limited, and is appropriately set as long as the formed second coating film 5 exhibits a reflection reducing effect and the wavelength conversion element 30 can exhibit good luminous efficiency. can do.
  • FIG. 4 is a cross-sectional view schematically showing the wavelength conversion element 40 according to the present embodiment. Further, FIG. 14 is an SEM image obtained by observing the surface of the wavelength conversion element 40 according to the present embodiment at a magnification of 2000 times.
  • the phosphor particles 2 and the voids 4 are formed. It differs from the above-described first to third embodiments in that the first coating film 3 is formed on the surface of at least a part of the phosphor particles 2 which are partially adjacent to each other.
  • the other configurations are the same as the configurations described in the first to third embodiments.
  • the heat conduction inside the wavelength conversion element is likely to be blocked as the volume occupied by the binder decreases and the volume occupied by the void increases. As a result, the thermal conductivity decreases.
  • the first coating film 3 formed on the inner wall of the void 4 forms a heat conduction path, the volume occupied by the binder 1 is small and the volume occupied by the void 4 is large. Even if it exists, it shows good thermal conductivity and can achieve high luminous efficiency.
  • the ratio of the volume occupied by the binder 1 to the total product of the wavelength conversion element 40 is not particularly limited, but may be, for example, 30% or less, and further 10% or less.
  • the wavelength conversion element 40 may include a second coating film 5 formed of a metal alkoxide on the surface of the wavelength conversion element and having an uneven structure on the surface. Good.
  • the same binder as that described in the first embodiment can be used, but a binder containing inorganic nanoparticles made of metal oxides such as silica and alumina can be particularly preferably used.
  • the same metal alkoxide and metal oxide as those described in the first and third embodiments can be used.
  • the binder 1, the first coating film 3 and the second coating film 5 are based on the same metal oxide, even if they are based on different metal oxides. Good.
  • FIG. 5 is a cross-sectional view schematically showing the wavelength conversion device 50 according to the present embodiment.
  • the wavelength conversion device 50 has a configuration in which a fluorescent layer 52 composed of any of the wavelength conversion elements of the first to fourth embodiments is laminated on a substrate 51.
  • the substrate 51 may be a reflective substrate that is reflective to the excitation light or a transmissive substrate that is transparent to the excitation light.
  • the reflective substrate is not particularly limited, but a metal substrate, for example, an aluminum substrate, a copper substrate, an alumina substrate, or the like is preferably used in order to improve the thermal conductivity. It is more preferable that the substrate is coated with a highly reflective film such as silver in order to increase the fluorescence emission intensity.
  • the transparent substrate is not particularly limited, but a glass substrate, a sapphire substrate, or the like is preferably used in order to improve the thermal conductivity.
  • the thickness of the substrate 51 and the fluorescent layer 52 can be appropriately set according to the desired application and the like.
  • the wavelength conversion device 50 according to the present embodiment is laminated by applying the phosphor ink composition on the substrate 51 in the film forming step of the method for manufacturing the wavelength conversion elements of the first to fourth embodiments. It can be produced by subjecting the obtained laminate to each step after the subsequent firing step.
  • the second coating film 5 includes the substrate 51 even if it is formed only on the surface of the fluorescence layer 52 composed of the wavelength conversion element 30. It may be formed on the entire surface of the wavelength converter.
  • FIG. 6 is a cross-sectional view schematically showing the wavelength conversion device 60 according to the present embodiment.
  • the wavelength conversion device 60 according to the present embodiment is different from the wavelength conversion device 50 of the fifth embodiment in that the enhancer reflection layer 53 is provided between the fluorescence layer 52 and the substrate 51.
  • Each other configuration is the same as the configuration described in the fifth embodiment.
  • the phosphorescent layer 53 Since the phosphorescent layer 53 is provided, the fluorescence from the fluorescent layer 52 is reflected by the reflective layer 53 and emitted, so that it is not easily affected by the reflectance of the substrate 51. In addition, the efficiency of light utilization can be further improved by efficiently reflecting fluorescence.
  • the antireflection layer 53 may be composed of an oxide multilayer film such as a SiO 2 / TiO 2 multilayer film, a dichroic mirror, and a scattering layer containing a binder and scattered particles.
  • the binder constituting the scattering layer may be a binder containing an inorganic compound or a binder containing an organic compound, but from the viewpoint of improving thermal conductivity, a binder containing an inorganic compound is preferable.
  • the inorganic compound include alumina, silica and the like.
  • the organic compound include silicone resin and the like.
  • FIG. 17 shows a schematic view schematically showing the light emitting system according to the seventh embodiment of the present disclosure.
  • the light emitting system is a headlight (vehicle headlight) including the wavelength conversion element according to the first to fourth embodiments or the wavelength conversion device according to the fifth or sixth embodiment as a fluorescence source 100.
  • a reflective laser headlight 110 is preferred.
  • the excitation light source 101 is preferably a blue laser light source that emits excitation light Y having a wavelength that excites the phosphor particles of the fluorescence source 100.
  • the reflector 102 is preferably composed of a semi-parabolic mirror. It is preferable that the paraboloid is divided into two upper and lower parts by a dividing surface 104 parallel to the xy plane to form a semi-paraboloid, and the inner surface thereof has a mirror configuration.
  • the reflector 102 has a through hole through which the excitation light Y passes.
  • the fluorescence source 100 is excited by the blue excitation light Y and emits fluorescence Z in the long wavelength region (yellow wavelength) of visible light.
  • the excitation light Y hits the irradiation surface of the fluorescence source 100 and becomes diffuse reflection light Y'.
  • the fluorescence source 100 is arranged at the focal position of the paraboloid on the dividing surface 104. Since the fluorescence source 100 is located at the focal point of the parabolic mirror, the fluorescence Z and diffuse reflection light Y'emitted from the fluorescence source 100 uniformly travel straight to the emission surface 103 when they hit the reflector 102 and are reflected. ..
  • White light which is a mixture of fluorescence Z and diffusely reflected light Y', is emitted from the exit surface 103 as parallel light.
  • FIG. 18 shows a schematic view schematically showing the light emitting system according to the eighth embodiment of the present disclosure.
  • the light emitting system is a transmission type lighting device including the wavelength conversion elements according to the first to fourth embodiments as a fluorescence layer 121 (that is, a fluorescence source), and is preferably a transmission type laser headlight 120.
  • FIG. 18 shows an example in which the fluorescent layer 121 is arranged on the transparent heat sink substrate 122.
  • the fluorescent layer 121 may be arranged alone without providing the transparent heat sink substrate 122.
  • the second coating film 5 includes the transparent heat sink substrate 122 even if it is formed only on the surface of the fluorescent layer 121. It may be formed on the surface of. Since the second coating film 5 is formed on the surface of the transmissive heat sink substrate 122, reflection of incident light can be suppressed.
  • a dichroic mirror capable of transmitting the excitation light wavelength and reflecting the fluorescence wavelength may be included between the transmissive heat sink substrate 122 and the fluorescence layer 121.
  • a dichroic mirror capable of transmitting the excitation light wavelength and reflecting the fluorescence wavelength may be included between the transmissive heat sink substrate 122 and the fluorescence layer 121.
  • the excitation light Y is irradiated from the side opposite to the fluorescence emitting surface to emit fluorescence.
  • the excitation light Y is irradiated from the surface of the transparent heat sink substrate 122 on the side opposite to the surface on which the fluorescent layer 121 is arranged.
  • the transparent heat sink substrate 122 preferably has a heat sink function. It is known that when the fluorescent layer 121 is deposited on the transmissive heat sink substrate 122 and the excitation light Y is incident from the heat sink side, the heat sink side has high heat dissipation.
  • the light emitted by the fluorescent layer 121 emits fluorescence from the surface facing the incident light side, is reflected by the paraboloid surface 123, and is emitted with directivity.
  • FIG. 19 shows a schematic plan view (xy plane) of the light emitting system according to the ninth embodiment of the present disclosure.
  • the light emitting system is a fluorescence wheel 210 including the wavelength conversion element according to the first to fourth embodiments or the wavelength conversion device according to the fifth or sixth embodiment as a fluorescence layer 200 (that is, a fluorescence source).
  • the fluorescent wheel 210 comprises at least one of the wavelength conversion elements 10, 20, 30, 40 or the wavelength conversion devices 50, 60 in at least a part of the surface of the wheel 203 that receives the excitation light emitted from the light source in the circumferential direction.
  • the fluorescent layer 200 is arranged.
  • the fluorescent wheel 210 comprises at least one of the wavelength conversion elements 10, 20, 30, 40 or the wavelength conversion devices 50, 60 in at least a part in the circumferential direction of the surface of the wheel 203 that receives the excitation light emitted from the light source. It suffices if the fluorescent layer 200 is arranged, and it is preferable that the fluorescent layer 200 is arranged concentrically on the wheel 203.
  • the fluorescent layer 200 is deposited on at least a part of the peripheral portion on the surface of the wheel 203.
  • FIG. 20 shows a schematic side view (xz plane) of a light emitting system further including a drive device 204 for rotating the wheel 203 in addition to the fluorescent wheel 210.
  • the wheel 203 is fixed to the rotating shaft 201 of the drive device 204 by the wheel fixture 202.
  • the drive device 204 is preferably a motor, and the wheel 203 fixed to the rotating shaft 201, which is the rotating shaft of the motor, by the wheel fixture 202 rotates with the rotation of the motor.
  • the fluorescent layer 200 deposited on at least a part of the peripheral portion on the surface of the wheel 203 receives the excitation light and emits fluorescence. Since the fluorescent layer 200 rotates with the rotation of the wheel 203, the fluorescent layer 200 emits fluorescence while rotating at any time.
  • FIG. 21 shows a schematic view of the light emitting system according to the tenth embodiment of the present disclosure.
  • the light emitting system further includes a driving device 204 for rotating the wheel 203 and an excitation light source 101, and is preferably used for a projector or the like.
  • the excitation light source 101 is preferably a blue laser light source that emits excitation light Y having a wavelength that excites the fluorescence layer 200.
  • a blue laser diode that excites a phosphor such as YAG or LuAG is used.
  • the excitation light Y that irradiates the fluorescent layer 200 can pass through the lenses 213, 214, and 215 on the optical path.
  • the mirror 211 may be arranged on the optical path of the excitation light Y.
  • the mirror 211 is preferably a dichroic mirror.
  • the fluorescent layer 200 deposited on at least a part of the peripheral portion on the surface of the wheel 203 receives the excitation light Y to emit fluorescent Z, passes through the mirror 211, and emits the fluorescent Z.
  • FIG. 22 shows a schematic view of the light emitting system according to the eleventh embodiment of the present disclosure.
  • the light emitting system is a projection device 300 that uses the light emitting system according to the tenth embodiment as a light source device 301.
  • the projection device 300 includes a light source device 301, a rotation position sensor 303 that acquires the rotation position of the fluorescent wheel 210, a light source control unit 304 that controls the excitation light source 101 based on output information from the rotation position sensor 303, and a display element. It includes a light source side optical system 306 that guides the light from the light source device 301 to the display element 307, and a projection side optical system 308 that projects the projected light from the display element 307 onto the screen.
  • the projection device 300 controls the output of the excitation light source 101 based on the information on the rotation position of the fluorescent wheel 210 acquired by the rotation position sensor 303.
  • the light source device 301 includes a fluorescent wheel 210 in which a wavelength conversion element is arranged in the circumferential direction at least in a part of the circumferential direction through which the excitation light Y emitted from the excitation light source 101 passes.
  • the excitation light Y of blue light emission passes through the fluorescent wheel 210 through the transmitting portion.
  • the excitation light Y that irradiates the fluorescent layer 200 can pass through the light source side optical system 306 and the mirrors 309a to 309c on the optical path.
  • the light source side optical system 306 is preferably a dichroic mirror.
  • a preferred dichroic mirror can reflect blue light incident at 45 degrees and transmit red and green light.
  • the blue light due to the excitation light Y incident on the dichroic mirror is reflected and directed to the fluorescent wheel 210.
  • blue light is transmitted through the fluorescent wheel 210 through the transmitting portion.
  • the excitation light Y irradiated to other than the transmitting portion due to the rotation timing of the fluorescent wheel 210 is fluorescently emitted by irradiating the fluorescent layer 200.
  • the fluorescently emitted red and green lights pass through the dichroic mirror and enter the display element 307.
  • the blue light transmitted through the transmitting portion is incident on the dichroic mirror again through the mirrors 309a to 309c, is reflected again by the dichroic mirror, and is incident on the display element 307.
  • the projector can include the light source device 301, a display element 307, a light source side optical system 306 (dichroic mirror), and a projection side optical system 308.
  • the light source side optical system 306 (dichroic mirror) guides the light from the light source device 301 to the display element 307, and the projection side optical system 308 may project the projected light from the display element 307 onto a screen or the like. it can.
  • the display element 307 is preferably a DMD (Digital Mirror Device).
  • the projection side optical system 308 preferably consists of a combination of projection lens.
  • the light emitting system of the present embodiment includes a substrate, a conductor such as a light emitting element chip arranged on the substrate and a metal as an electrode, and a sealing portion for sealing the light emitting element chip, and the sealing portion is the above-mentioned. It is a light emitting device including the wavelength conversion element according to the first to fourth embodiments.
  • the light emitting element chip and the conductor are electrically connected on the substrate.
  • the substrate may have a housing shape or another shape.
  • the light emitting device chip is an LED (Light Emitting Diode) chip.
  • a part of the light emitted from the LED chip is converted into light of another wavelength in the sealing portion including the wavelength conversion element according to the above-described first to fourth embodiments.
  • White light can be obtained by taking out the light emitted from the LED chip in a state in which the light that has not been wavelength-converted in the sealing portion and the light that has been wavelength-converted in the sealing portion are mixed and taken out. ..
  • the second coating film 5 is formed on the entire surface including the substrate even if it is formed only on the surface of the sealing portion. You may be.
  • at least a part of the surface of the substrate may be formed of a metal alkoxide and coated with a second coating film 5 having an uneven structure on the surface.
  • the wavelength conversion elements (10, 20, 30, 40) according to the first aspect of the present disclosure are dispersed in the binder (1) and the binder (1), and receive the excitation light (Y) to have a predetermined wavelength. It contains a plurality of phosphor particles (2) emitting band light and a plurality of voids dispersed in the binder (1), and at least a part of the voids is formed from a metal alkoxide on at least a part of the inner wall. It is a configuration including the formed first coating film (3).
  • the wavelength conversion element (20, 30, 40) according to the second aspect of the present disclosure may have a configuration in which the first coating film (3) has an uneven structure on the surface in the above aspect 1.
  • the wavelength conversion element (20, 30, 40) according to the third aspect of the present disclosure may have a structure in which the uneven structure is a petal-like structure in the above aspect 2.
  • the wavelength conversion element (30, 40) according to the fourth aspect of the present disclosure is formed by a second coating film (5) formed of a metal alkoxide and having an uneven structure on the surface in any one of the above aspects 1 to 3. , At least a part of the surface may be covered.
  • the wavelength conversion device (50, 60) according to the fifth aspect of the present disclosure includes a fluorescent layer (52) composed of the wavelength conversion element (10, 20, 30, 40) according to any one of the above aspects 1 to 4. It is a configuration including a substrate (51).
  • the wavelength conversion device (50, 60) may have a configuration in which the substrate (51) is a reflective substrate having reflectivity to the excitation light (Y) in the above aspect 5. ..
  • the wavelength conversion device (60) according to the seventh aspect of the present disclosure may be configured to include the brightening reflection layer (53) between the fluorescence layer (52) and the reflection substrate in the above aspect 6.
  • the wavelength conversion device (50, 60) may have a configuration in which the substrate (51) is a transmissive substrate having transparency to the excitation light (Y) in the fifth aspect. Good.
  • the eighth aspect at least a part of the surface of the transparent substrate is formed of a metal alkoxide, and the surface has an uneven structure. It may be configured to be covered with a coating film.
  • the light emitting system is a light emitting system including a fluorescent source, wherein the fluorescent source is the wavelength conversion element (10, 20, 30, 40) according to any one of the above aspects 1 to 4. , Or the wavelength conversion device (50, 60) according to any one of aspects 5 to 9.
  • the light emitting system according to the eleventh aspect of the present disclosure is the light emitting system which is a headlight for a vehicle in the above aspect 10, and the excitation light source (101) for irradiating the fluorescence source (100) with excitation light and the above.
  • a reflector (102) having a reflecting surface for reflecting the fluorescence emitted from the fluorescence source (100) is further provided, and the reflecting surface of the reflector (102) reflects the incident light in parallel in a certain direction. It is a configuration having a shape to make it.
  • the light emitting system according to the 12th aspect of the present disclosure is the light emitting system which is a transmission type illumination device in the above aspect 10, and the fluorescence source (121) is the wavelength conversion element according to any one of the aspects 1 to 4. (10, 20, 30, 40), or the wavelength conversion device (50, 60) according to any one of aspects 5, 8 to 9, wherein the irradiation surface to which the excitation light is irradiated faces the irradiation surface.
  • the configuration is such that the fluorescence source (121) is further provided with an excitation light source (101) arranged on the same side as the irradiation surface.
  • the light emitting system according to the thirteenth aspect of the present disclosure is a light emitting system which is a fluorescent wheel (210) in the above aspect 10, further comprising a wheel (203), and the fluorescent source (200) is the wheel (203). ) Is arranged in at least a part of the surface in the circumferential direction.
  • the light emitting system is the light emitting system which is a light source device in the above aspect 10, the wheel (203), the driving device (204) for rotating the wheel (203), and the fluorescence.
  • the source (200) is further provided with an excitation light source (101) that irradiates the source (200) with excitation light, and the fluorescence source (200) is arranged in at least a part of the surface of the wheel (203) in the circumferential direction.
  • the fluorescence source (200) emits fluorescence.
  • the light emitting system according to the 15th aspect of the present disclosure is the light emitting system which is the projection device (300) in the above aspect 10, and displays the fluorescence from the display element (307) and the fluorescence source (200).
  • the configuration further includes a light source side optical system (306) that guides light to (307), and a projection side optical system (308) that projects the projected light from the display element (307) onto the screen.
  • the light emitting system according to the 16th aspect of the present disclosure is the light emitting system which is a light emitting device in the above aspect 10, further comprising a substrate, a light emitting element chip and a conductor arranged on the substrate, and the fluorescence.
  • the source is the wavelength conversion element (10, 20, 30, 40) according to any one of the above aspects 1 to 4, and the sealing portion for sealing the light emitting element chip is formed.

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PCT/JP2020/037834 2019-12-04 2020-10-06 波長変換素子、波長変換装置および発光システム Ceased WO2021111724A1 (ja)

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CN202080084055.9A CN114766009A (zh) 2019-12-04 2020-10-06 波长转换元件、波长转换装置及发光系统

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