WO2015045886A1 - Dispositif à source de lumière fluorescente - Google Patents

Dispositif à source de lumière fluorescente Download PDF

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Publication number
WO2015045886A1
WO2015045886A1 PCT/JP2014/074093 JP2014074093W WO2015045886A1 WO 2015045886 A1 WO2015045886 A1 WO 2015045886A1 JP 2014074093 W JP2014074093 W JP 2014074093W WO 2015045886 A1 WO2015045886 A1 WO 2015045886A1
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WIPO (PCT)
Prior art keywords
excitation light
fluorescent
light
wavelength conversion
fluorescence
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PCT/JP2014/074093
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English (en)
Japanese (ja)
Inventor
井上　正樹
政治 北村
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ウシオ電機株式会社
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Publication of WO2015045886A1 publication Critical patent/WO2015045886A1/fr

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    • 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
    • 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
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/12—Combinations of only three kinds of elements
    • F21V13/14—Combinations of only three kinds of elements the elements being filters or photoluminescent elements, reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers

Definitions

  • the present invention relates to a fluorescent light source device that emits fluorescence from the phosphor by exciting the phosphor with excitation light.
  • a fluorescent light source device a configuration in which a fluorescent material is irradiated with laser light from a semiconductor laser as excitation light and emitted from the fluorescent material is known.
  • a certain type of such a fluorescent light source device has a fluorescent member 51 made of a YAG sintered body on a surface of a substrate 52 made of an AIN sintered body with a barium sulfate layer 53 interposed therebetween.
  • a wavelength conversion member is provided (see, for example, Patent Document 1).
  • a heat radiating member 55 having heat radiating fins 55 a is provided on the back surface of the substrate 52.
  • the surface of the fluorescent member 51 is the surface of the wavelength converting member
  • the surface of the fluorescent member 51 is the excitation light receiving surface and the fluorescent light emitting surface.
  • a convex portion 24 having a tapered surface such as a substantially pyramid shape is periodically formed on the surface of the fluorescent member 22 that is an excitation light receiving surface.
  • Some include a wavelength conversion member provided with a periodic structure 23 arranged. In this wavelength conversion member, a light reflecting film 33 is provided on the back surface of the fluorescent member 22.
  • the surface of the fluorescent member 22 is the surface of the wavelength conversion member, and the surface of the fluorescent member 22 is the excitation light receiving surface and the fluorescent light emitting surface.
  • FIG. 6 is a macroscopic view showing a change in the refractive index of the medium through which the excitation light L propagates when the excitation light L is incident on the surface of the fluorescent member 22.
  • FIG. 6 a cross-sectional view schematically showing an enlarged part of the fluorescent member 22 is shown on the left side, and the position and refractive index in a direction perpendicular to the surface of the fluorescent member 22 are shown on the right side.
  • the graph which shows the macro relationship with is shown.
  • the excitation light L when the excitation light L is irradiated from the air (refractive index is 1) onto the surface of the fluorescent member 22 (refractive index is N 1 ), the excitation light L forms the periodic structure 23. The light is incident from a direction inclined with respect to the tapered surface of the convex portion 24.
  • the refractive index of the medium through which the excitation light L propagates gradually changes from 1 to N 1 in the direction perpendicular to the surface of the fluorescent member 22. Therefore, since the surface of the fluorescent member 22 has substantially no interface where the refractive index changes rapidly, it is possible to suppress the excitation light L from being reflected on the surface of the fluorescent member 22.
  • the laser light from the semiconductor laser which is the excitation light L
  • the excitation light L has a very small irradiation diameter, and is therefore incident on the fluorescent member 22 locally.
  • the excited light L cannot be sufficiently converted into fluorescence.
  • the energy of the excitation light L that is absorbed by the phosphor and not converted to fluorescence becomes heat, the heat causes the phosphor member 22 to be heated, resulting in a high temperature of the phosphor itself. As a result, temperature quenching occurs, and a sufficient fluorescent light flux cannot be obtained. Therefore, there is a problem that the fluorescence intensity of the fluorescence emitted to the outside from the wavelength conversion member is reduced. Further, as shown in FIG.
  • the light emitted to the outside from the surface of the wavelength conversion member that is, the surface of the fluorescent member 22, contains not only the fluorescence L3 but also the excitation light, and the excitation thereof. Since the light has directivity, there is also a problem that color unevenness occurs in the light emitted from the surface of the wavelength conversion member. And since such a problem arises, in a fluorescence light source device, the excitation light radiate
  • the excitation light L incident on the wavelength conversion member has directivity.
  • the excitation light contained in the light emitted from the surface of the wavelength conversion member that is, the surface of the fluorescent member 22 is incident from the surface of the wavelength conversion member and is not absorbed by the phosphor, and the wavelength conversion is performed.
  • the excitation light L4 specularly reflected by the wavelength conversion member is such that the fluorescent member 22 constituting the wavelength conversion member causes the light to travel substantially linearly. Emitted from the surface. Therefore, in the light emitted to the outside from the surface of the wavelength conversion member, the distribution of the excitation light is significantly different from the distribution of the fluorescence L3 emitted isotropically from the phosphor inside the wavelength conversion member.
  • the color unevenness generated in the light emitted to the outside from the surface of the wavelength conversion member is the light from the surface of the wavelength conversion member to the light emission port of the fluorescent light source device due to the nature of the light. It cannot be resolved on the road.
  • the problem of this uneven color generation is that the surface of the wavelength conversion member (the surface of the fluorescent member) is used as the excitation light receiving surface and the fluorescent light emitting surface as shown in FIG. This is not limited to the configuration, but also occurs when light (light including fluorescence and excitation light) is emitted from the front and back surfaces of the wavelength conversion member (front and back surfaces of the fluorescent member). .
  • the present invention has been made on the basis of the circumstances as described above, and its purpose is to obtain a fluorescent light that can obtain high luminous efficiency and light having high uniformity without color unevenness.
  • the object is to provide a light source device.
  • the fluorescent light source device of the present invention is a fluorescent light source device comprising a wavelength conversion member by a phosphor excited by excitation light,
  • the wavelength converting member has a periodic structure in which convex portions are periodically arranged on an excitation light receiving surface, a fluorescent member containing a phosphor, and excitation formed on the excitation light receiving surface of the fluorescent member. And a light diffusion layer.
  • the excitation light diffusion layer is preferably formed by dispersing at least fine particles that diffuse excitation light in a light-transmitting material that transmits excitation light and fluorescence.
  • the excitation light diffusion layer is partially disposed on the excitation light receiving surface of the fluorescent member.
  • the wavelength conversion member has an excitation light diffusion layer formed on the excitation light receiving surface of the fluorescence member, the excitation light diffused in the excitation light diffusion layer is formed on the fluorescence member. Is incident. Therefore, even if the excitation light is locally incident on the wavelength conversion member, the excitation light is prevented from being locally incident on the fluorescent member. As a result, in the fluorescent member, the incident excitation light can be sufficiently converted into fluorescence, and the temperature rise of the fluorescent member is suppressed accordingly. Therefore, fluorescence caused by temperature quenching in the phosphor is caused. Reduction of the amount of light can be suppressed.
  • the excitation light incident on the wavelength conversion member has directivity
  • the excitation light incident on the wavelength conversion member is emitted outside without being emitted while maintaining the directivity.
  • excitation light emitted to the outside from the wavelength conversion member and fluorescence emitted isotropically from the phosphor are synthesized on an average, so that excitation is performed in the light emitted from the wavelength conversion member to the outside.
  • the light distribution and the fluorescence distribution can be made substantially equal. As a result, the excitation light emitted from the wavelength conversion member to the outside can be used effectively.
  • the fluorescent member has a periodic structure in which convex portions are periodically arranged on the excitation light receiving surface, excitation light can be sufficiently taken into the fluorescent member, and the fluorescent member Fluorescence emitted from the phosphor constituting the member can be extracted from the wavelength conversion member to the outside with high efficiency. Therefore, according to the fluorescent light source device of the present invention, the fluorescence can be generated with high efficiency inside the wavelength conversion member, and the fluorescence can be emitted to the outside with high efficiency, so that a large amount of fluorescent light can be obtained. Moreover, since the excitation light emitted to the outside from the wavelength conversion member together with the fluorescence can be used without causing the adverse effect of color unevenness, the amount of light emitted from the fluorescent light source device increases. Therefore, high luminous efficiency can be obtained, and light having high uniformity without color unevenness can be obtained.
  • the excitation light diffusion layer is partially arranged on the excitation light receiving surface of the fluorescent member, thereby controlling the arrangement position of the excitation light diffusion layer and, if necessary, the thickness of the fluorescent member.
  • FIG. 1 is an explanatory view showing an outline of the configuration of an example of the fluorescent light source device of the present invention
  • FIG. 2 is an explanatory sectional view showing an enlarged part of the wavelength conversion member in the fluorescent light source device of FIG. is there.
  • the fluorescent light source device 10 includes an excitation light source 11 made of, for example, a semiconductor laser, and a wavelength conversion member 21 that emits fluorescence when excited by the excitation light L emitted from the excitation light source 11. And a fluorescent light emitting member 20.
  • the fluorescent light emitting member 20 is disposed in a posture inclined with respect to the optical axis of the excitation light source 11 so as to face the excitation light source 11. Further, a collimator lens 15 that emits the incident excitation light L as a parallel light beam is disposed between the excitation light source 11 and the fluorescent light emitting member 20 at a position close to the excitation light source 11.
  • the fluorescent light emitting member 20 has a substantially rectangular plate-shaped wavelength conversion member 21 provided on the surface of a rectangular substrate 31 (upper surface in FIG. 1).
  • the wavelength conversion member 21 has a substantially rectangular plate-like fluorescent member 22 and a substantially rectangular shape formed on the surface (the upper surface in FIGS. 1 and 2) of the fluorescent member 22.
  • a plate-like excitation light diffusion layer 25 disposed such that the surface of the excitation light diffusion layer 25 (the upper surface in FIGS. 1 and 2) faces the excitation light source 11, and the surface of the excitation light diffusion layer 25 is the wavelength conversion member. 21 surface.
  • a light reflecting film 33 made of a silver (Ag) film or a multilayer film is provided on the back surface of the wavelength conversion member 21, that is, the back surface of the fluorescent member 22 (the lower surface in FIGS. 1 and 2).
  • the wavelength conversion member 21 is provided with the light reflection film 33 so as to have a reflection function on the back surface.
  • a bonding member (not shown) is interposed between the light reflection film 33 and the substrate 31, and the wavelength conversion member 21 is bonded onto the substrate 31 by the bonding member.
  • solder, a silver sintered material, or the like is used from the viewpoint of exhaust heat.
  • a heat radiating member (not shown) made of a metal such as copper is disposed on the back surface of the substrate 31.
  • the fluorescent member 22 is provided with a periodic structure 23 in which convex portions 24 are periodically arranged on a surface that is an excitation light receiving surface.
  • the convex portion 24 has a shape having a tapered surface such as a substantially pyramid shape. Since the convex portion 24 has a tapered surface, as described above (specifically, as described with reference to FIG. 6), the refractive index rapidly changes on the surface of the fluorescent member 22. Since the interface is substantially eliminated, reflection of excitation light on the surface of the fluorescent member 22 can be prevented or suppressed.
  • the periodic structure 23 has a moth-eye structure in which substantially conical convex portions 24 are densely arranged in a two-dimensional manner.
  • the inclination angle (angle which a side surface and a bottom face make) of a taper surface (side surface) is 5 degrees or more.
  • the taper surface is regarded as a boundary surface between two media having different refractive indexes. Therefore, the reflected light according to the difference in refractive index (reflection of excitation light). May occur.
  • the period d is preferably the size of the range (Bragg's condition) in which diffraction of fluorescence emitted from the phosphor constituting the fluorescent member 22 occurs.
  • the period d of the periodic structure 23 is a value obtained by dividing the peak wavelength of the fluorescence emitted from the phosphor by the refractive index of the material (specifically, the fluorescent member 22) constituting the periodic structure 23 ( Hereinafter, it is referred to as “optical length”) or a value of several times the optical length.
  • the period of the periodic structure means a center-to-center distance (nm) between adjacent convex portions in the periodic structure.
  • the period d of the periodic structure 24 is set to a size within a range in which the fluorescence diffraction generated inside the fluorescent member 22 occurs, so that the fluorescence is emitted from the surface of the fluorescent member 22 with high efficiency and from the surface of the wavelength conversion member 21. Can be taken out.
  • the refractive index of the fluorescent member 22 is 1.83.
  • the aspect ratio which is the ratio (h / d) of the height h of the convex portion 24 to the period d in the periodic structure 23, is 0.2 or more, preferably 0.2 to 1.5, and particularly preferably. Is 0.5 to 1.0.
  • the aspect ratio of the periodic structure 23 is 0.2 or more, the fluorescence generated inside the fluorescent member 22 can be emitted from the surface of the fluorescent member 22 with high efficiency and extracted from the surface of the wavelength conversion member 21 to the outside. it can.
  • the aspect ratio in the periodic structure 23 is 0.2 or more, reflection of excitation light on the surface of the fluorescent member 22 can be suppressed. Therefore, the excitation light can be sufficiently taken into the fluorescent member 22 when the excitation light is irradiated on the surface of the fluorescent member 22.
  • Such a periodic structure 23 can be formed by a nanoimprint method and a dry etching process. Specifically, a resist is applied to the surface of the rectangular plate-like fluorescent member by, for example, a spin coating method, and then a resist coating film is patterned by, for example, a nanoimprint method. Then, the periodic structure 23 is formed by performing a dry etching process to the exposed area
  • the fluorescent member 22 contains a phosphor.
  • the fluorescent member 22 is made of a single crystal or polycrystalline phosphor, or a mixture of a single crystal or polycrystalline phosphor and a ceramic binder. It consists of a knot. That is, the fluorescent member 22 is composed of a single crystal or polycrystalline phosphor.
  • the sintered body of the mixture of the phosphor and the ceramic binder used as the fluorescent member 22 nano-sized alumina particles are used as the ceramic binder. This sintered body is obtained by mixing several mass% to several tens mass% ceramic binder with respect to 100 mass% of the phosphor, pressing the mixture, and then firing.
  • the fluorescent member 22 is made of a single crystal or polycrystalline phosphor, the fluorescent member 22 has high thermal conductivity. Therefore, in the fluorescent member 22, the heat generated by the irradiation of the excitation light is efficiently exhausted, so that the fluorescent member 22 is suppressed from becoming a high temperature.
  • the single crystal phosphor constituting the fluorescent member 22 can be obtained, for example, by the Czochralski method. Specifically, the seed crystal is brought into contact with the melted raw material in the crucible, and in this state, the seed crystal is pulled up in the vertical direction while rotating the seed crystal to grow the single crystal on the seed crystal. The body is obtained.
  • the polycrystalline fluorescent substance which comprises the fluorescent member 22 can be obtained as follows, for example. First, raw materials such as a base material, an activator, and a firing aid are pulverized by a ball mill or the like to obtain raw material fine particles of submicron or less. Next, using this raw material fine particles, a molded body is formed and sintered by, for example, a slip casting method. Thereafter, a polycrystalline phosphor having a porosity of 0.5% or less, for example, is obtained by subjecting the obtained sintered body to hot isostatic pressing.
  • the phosphor constituting the fluorescent member 22 include YAG: Ce, YAG: Pr, YAG: Sm, and LuAG: Ce.
  • the doping amount of the rare earth element (activator) is about 0.5 mol%.
  • the thickness of the fluorescent member 22 is, for example, 0.05 to 2.0 mm from the viewpoint of conversion efficiency (quantum yield) of the excitation light L into fluorescence and exhaust heat.
  • the excitation light diffusion layer 25 is integrally formed on the surface of the fluorescent member 22, that is, the excitation light receiving surface of the fluorescent member 22.
  • the excitation light diffusion layer 25 is formed on the entire surface of the fluorescent member 22, and the entire surface of the fluorescent member 22 is covered with the excitation light diffusion layer 25.
  • the excitation light diffusion layer 25 preferably has a thickness equal to or higher than the height h of the convex portion 24.
  • the thickness of the excitation light diffusion layer 25 indicates the maximum thickness. Since the thickness of the excitation light diffusion layer 25 is not less than the height h of the convex portion 24, the convex portion 24 can be embedded by the excitation light diffusion layer 25.
  • the convex part 24 which comprises 23 can be protected reliably. Therefore, for example, in the process of assembling the constituent members in the manufacturing process of the fluorescent light source device 10, another constituent member (for example, the excitation light source 11) contacts the surface of the wavelength conversion member 21, that is, the surface of the excitation light diffusion layer 25.
  • the fluorescence light source device 10 is easy to handle and has high reliability.
  • the surface of the excitation light diffusion layer 25 may be flat, but from the viewpoint of availability of the excitation light L, it is preferable that the surface is uneven.
  • the specific thickness of the excitation light diffusion layer 25 is appropriately determined according to the height h of the convex portion 24, and is, for example, 10 to 300 ⁇ m.
  • the excitation light diffusion layer 25 is a fine particle that diffuses at least the excitation light in the light-transmitting material 26 that transmits the excitation light and the fluorescence generated inside the fluorescent member 22 (hereinafter, also referred to as “diffusion microparticle”). 27 is dispersed.
  • the light transmissive material 26 is appropriately selected according to the excitation light L from the excitation light source 11 and the wavelength of the fluorescence generated inside the fluorescent member 22, but is preferably an inorganic material.
  • the excitation light diffusion layer 25 is prevented from being deformed and altered by the influence of heat such as heat of the excitation light L and heat generated by irradiation of the excitation light L. Or suppressed. Therefore, high reliability can be obtained for the wavelength conversion member 21 over a long period of time.
  • the light transmissive material 26 include, for example, a low-melting glass and a cured product of a sol-gel material.
  • the sol-gel material specifically includes an alkoxide such as silicon, titanium, zirconium, etc., and the reaction (hydrolysis and condensation polymerization) proceeds by heat treatment, whereby an inorganic material is formed. Materials.
  • the light transmissive material 26 preferably has a large refractive index. Specifically, the refractive index is preferably equal to or higher than the refractive index value of the fluorescent member 22.
  • the excitation light diffusion layer 25 is made of the light transmissive material 26 having a refractive index higher than the refractive index value of the fluorescent member 22, the fluorescence incident on the fluorescent member 22, the excitation light diffusion layer 25, and the interface is not affected. Refraction occurs by passing through the interface. Therefore, since the direction of travel of the fluorescence is changed at the interface between the fluorescent member 22 and the excitation light diffusion layer 25, the fluorescence is prevented from being trapped inside the wavelength conversion member 21, and as a result, the fluorescence is diffused into the excitation light.
  • the light can be emitted from the surface of the layer 25 to the outside with high efficiency.
  • the light transmissive material 26 for example, a low-melting glass having a refractive index of 1.45 to 2.0 and a cured product of a sol-gel material having a refractive index of 1.46 can be used.
  • the diffusion microparticles 27 have an excitation light diffusion function for diffusing excitation light, but may have a fluorescence diffusion function for diffusing fluorescence generated inside the fluorescent member 22 together with the excitation light diffusion function. .
  • the diffusing microparticles 27 appropriate ones are used depending on the wavelength of the excitation light L from the excitation light source 11 and the wavelength of the fluorescence generated inside the fluorescent member 22 as necessary, but are made of an inorganic compound. It is preferable.
  • the diffusion microparticles 27 may be deformed and altered by the influence of heat such as heat of the excitation light L and heat generated by irradiation of the excitation light L. Prevented or suppressed. Therefore, high reliability can be obtained for the wavelength conversion member 21 over a long period of time.
  • the inorganic compound constituting the diffusion microparticle 27 include metal oxides such as titanium oxide (TiO 2 ), zinc oxide (ZnO), aluminum oxide (Al 2 O 3 ), magnesium oxide (MgO), and sulfuric acid. Examples thereof include metal sulfates such as barium (BaSO 4 ).
  • the diffusion minute particles 27 constituting the excitation light diffusion layer 25 may be made of particles of one kind of material, or may be a combination of particles of different materials.
  • the diffusion fine particles 27 preferably have an average particle diameter of several nm to several tens of ⁇ m, and more preferably several hundred nm to several ⁇ m.
  • the average particle size of the diffusion microparticles 27 By setting the average particle size of the diffusion microparticles 27 to several nanometers to several tens of micrometers, the laser light as the excitation light L can be sufficiently diffused when a semiconductor laser is used as the excitation light source 11. Since the average particle size of the diffusion microparticles 27 is several hundred nm to several ⁇ m, Mie scattering can be generated, so that the excitation light L incident on the excitation light diffusion layer 25 can be easily transmitted in all directions. Can be diffused.
  • the content ratio of the diffusion microparticles 27 is determined based on the wavelength and intensity of light required for the fluorescent light source device 10, the type of the excitation light source 11, the thickness of the fluorescent member 22, and the shape of the excitation light diffusion layer 25. For example, it is several volume% to 40 volume% with respect to a total of 100 volume% of the light transmissive material 26 and the diffusing fine particles 27.
  • the diffusion microparticles 27 can be uniformly dispersed in the excitation light diffusion layer 25, and thus the excitation light diffusion layer 25.
  • the excitation light L incident on the light can be incident on the fluorescent member 22 or emitted outside from the wavelength conversion member 21 in a sufficiently diffused state.
  • the excitation light diffusing layer 25 is mixed with, for example, low-melting glass particles and diffusing fine particles 27, and the surface of the fluorescent member 22 is obtained by the obtained mixture.
  • the mixture layer can be formed by firing at a temperature of about 450 to 700 ° C., for example.
  • the light transmissive material 26 is a cured product of a sol-gel material, for example, the sol-gel material and the diffusion microparticles 27 are mixed, and a mixture layer is formed on the surface of the fluorescent member 22 by the obtained mixture.
  • the mixture layer can be formed by heating at a temperature of about 300 to 500 ° C., for example.
  • the substrate 31 As a material constituting the substrate 31, an aluminum substrate or the like via a heat radiation adhesive in which metal fine powder is mixed into a resin can be used.
  • the thickness of the substrate 31 is, for example, 0.5 to 1.0 mm.
  • the aluminum substrate may have a function of a heat radiating fin.
  • the excitation light L emitted from the excitation light source 11 is collimated by the collimator lens 15. Thereafter, the excitation light L is irradiated on the surface of the wavelength conversion member 21 in the fluorescent light emitting member 20, that is, the surface of the excitation light diffusion layer 25, and is incident on the fluorescence member 22 through the excitation light diffusion layer 25. And in the fluorescent member 22, the fluorescent substance which comprises the said fluorescent member 22 is excited. Thereby, fluorescence is emitted from the phosphor in the fluorescent member 22. The fluorescence is emitted from the surface of the wavelength conversion member 21 to the outside and is emitted to the outside of the fluorescence light source device 10.
  • the excitation light L incident on the wavelength conversion member 21 is diffused in the excitation light diffusion layer 25, and the diffused light L1 of the excitation light L diffused in the excitation light diffusion layer 25 is A part of the light is incident on the fluorescent member 22 and the other part is emitted from the surface of the excitation light diffusion layer 25 to the outside. Therefore, even if the excitation light L is locally incident on the wavelength conversion member 21, the excitation light is not locally incident on the fluorescent member 22. As a result, in the fluorescent member 22, the incident excitation light can be sufficiently converted into fluorescence, and the temperature rise of the fluorescent member 22 is suppressed accordingly, so that temperature quenching occurs in the phosphor. It is possible to suppress a reduction in the amount of fluorescent light.
  • the excitation light L incident on the wavelength conversion member 21 has directivity, it is reflected by the light reflecting film 33 on the back surface of the wavelength conversion member 21 without being absorbed by the phosphor, and again on the surface.
  • the excitation light that reaches up to has no directivity and is emitted in a diffused state.
  • the excitation light emitted from the wavelength conversion member 21 specifically, the diffused light L1 diffused in the direction toward the surface of the excitation light diffusion layer 25 in the excitation light diffusion layer 25 and the light reflection film 33).
  • the reflected excitation light) and the fluorescence emitted isotropically from the phosphor are synthesized on average, and in the light L2 emitted from the wavelength conversion member 21, the excitation light distribution and the fluorescence distribution Can be substantially equivalent. Therefore, the excitation light emitted from the surface of the wavelength conversion member 21 to the outside can be used effectively. Further, since the fluorescent member 22 has the periodic structure 23 in which the convex portions 24 are periodically arranged on the excitation light receiving surface, the excitation light (diffused light L1) is sufficiently supplied into the fluorescent member 22. While being able to take in, the fluorescence radiated
  • the fluorescent member 22 since the fluorescent member 22 has a reflection function on the back surface, the fluorescence generated inside the wavelength conversion member 21 and the fluorescent member 22 is not incident on the wavelength conversion member 21 and absorbed by the phosphor. Excitation light can be used with extremely high efficiency. Therefore, higher luminous efficiency can be obtained. Therefore, according to the fluorescence light source device 10, since the fluorescence can be generated with high efficiency inside the wavelength conversion member 21, and the generated fluorescence can be emitted to the outside with high efficiency, a large amount of fluorescence can be obtained. Moreover, since the excitation light emitted to the outside from the wavelength conversion member 21 together with the fluorescence can be used without causing the adverse effect of color unevenness, the amount of light emitted from the fluorescent light source device is increased. Therefore, high luminous efficiency can be obtained, and light having high uniformity without color unevenness can be obtained.
  • the fluorescent light source device 10 can be suitably used as a pseudo-white light source because the fluorescent light and the excitation light are synthesized and mixed to obtain light having excellent color uniformity.
  • FIG. 3 is an explanatory partial cross-sectional view illustrating a configuration of a wavelength conversion member in another example of the fluorescent light source device of the present invention.
  • This fluorescent light source device is the same as the fluorescent light source device 10 of FIG. 1 except that the wavelength conversion member 41 is such that the excitation light diffusion layer 25 is partially disposed on the excitation light receiving surface of the fluorescent member 22. It has a configuration.
  • a light reflection film (not shown) is provided on the back surface of the fluorescent member 22.
  • the configuration of the fluorescent member 22 and the excitation light diffusion layer 25 is basically the same as that of the wavelength conversion member 21 according to FIG. 1 except that the excitation light diffusion layer 25 is partially disposed.
  • the fluorescent member 22 is thicker than the case where the excitation light diffusion layer 25 is formed on the entire surface of the fluorescent member 22 as shown in FIGS. 1 and 2. Is preferred. Specifically, the thickness of the fluorescent member 22 is preferably 0.13 mm or more. When the thickness of the fluorescent member 22 is 0.13 mm or more, the intensity of the excitation light reflected on the back surface of the fluorescent member 22 and reaching the surface again is reduced. Therefore, by partially disposing the excitation light diffusion layer 25, the ratio between the fluorescence intensity and the excitation light intensity in the light L2 emitted to the outside from the wavelength conversion member 41 can be easily adjusted.
  • the partial arrangement position of the excitation light diffusion layer 25 on the surface of the fluorescent member 22 is determined based on the wavelength and intensity of the light required for the fluorescent light source device, and the thickness of the fluorescent member 22. It is determined appropriately according to the above.
  • the excitation light diffusion layer 25 is a portion where the excitation light diffusion layer 25 is disposed in a region where the excitation light L from the excitation light source is irradiated on the surface of the fluorescent member 22 (hereinafter referred to as “excitation light diffusion layer”). And a portion where the excitation light diffusion layer 25 is not disposed (hereinafter also referred to as “non-excitation light diffusion layer portion”).
  • the excitation light diffusion layer portion and the non-excitation light diffusion layer portion exist in the region irradiated with the excitation light L, the light emitted to the outside from the wavelength conversion member 41 is converted into the fluorescence intensity and the excitation. It may have an intended characteristic in which the ratio of light intensity is adjusted.
  • the excitation light diffusion layer 25 when the thickness of the fluorescent member 22 is 0.13 mm or more, the excitation light diffusion layer 25 is formed on the entire surface of the fluorescent member 22 as shown in FIGS. Compared with the case where it is formed, the content ratio of the diffusion microparticles 27 can be increased. Specifically, the content ratio of the diffusion microparticles 27 is preferably 5 to 70% by volume with respect to 100% by volume of the total of the light transmissive material 26 and the diffusion microparticles. When the content of the diffusion microparticles 27 is 5 to 70% by volume, the excitation light diffusion layer 25 can be easily formed.
  • the reason is that in the process of manufacturing the excitation light diffusion layer 25, even if the mixture for forming the excitation light diffusion layer 25 (the mixture containing the diffusion microparticles 27) does not have high uniformity, the obtained excitation can be obtained.
  • the light diffusing layer 25 is in a state in which the light diffusing particles 27 exist in the entire surface direction on the surface of the fluorescent member 22.
  • high uniformity may not be obtained in the mixture of the low melting point glass particles and the diffusion microparticles 27, and the sol-gel material and the diffusion microparticles 27 may not be obtained. In the mixture, it is not necessary to obtain high uniformity due to sedimentation of the diffusion microparticles 27.
  • the excitation light L emitted from the excitation light source 11 is collimated by the collimator lens. Thereafter, the excitation light L is applied to the surface of the wavelength conversion member 41 in the fluorescent light emitting member, that is, the surface of the excitation light diffusion layer 25 and the non-excitation light diffusion layer portion.
  • the excitation light L applied to the surface of the excitation light diffusion layer 25 is incident on the fluorescent member 22 through the excitation light diffusion layer 25, while the excitation light L applied to the non-excitation light diffusion layer portion is The light is directly incident on the fluorescent member 22.
  • the fluorescent substance which comprises the said fluorescent member 22 is excited. Thereby, fluorescence is emitted from the phosphor in the fluorescent member 22.
  • the fluorescence is emitted to the outside from the surface of the wavelength conversion member 41, that is, the surface of the excitation light diffusion layer 25 and the non-excitation light diffusion layer portion, and is emitted to the outside of the fluorescence light source device.
  • the excitation light L incident on the wavelength conversion member 41 is diffused in the excitation light diffusion layer 25.
  • a part of the diffused light L1 of the excitation light L diffused in the excitation light diffusion layer 25 is incident on the fluorescent member 22, and the other part is emitted from the surface of the excitation light diffusion layer 25 to the outside. . Therefore, even if the excitation light L is locally incident on the wavelength conversion member 21, the excitation light is not locally incident on the fluorescent member 22.
  • the incident excitation light can be sufficiently converted into fluorescence, and the temperature rise of the fluorescent member 22 is suppressed accordingly, so that temperature quenching occurs in the phosphor.
  • the excitation light L incident on the wavelength conversion member 21 has directivity, it is reflected by the light reflecting film 33 on the back surface of the wavelength conversion member 41 without being absorbed by the phosphor, and again on the surface.
  • the excitation light that has reached up to has no directivity and is emitted to the outside in a diffused state.
  • the excitation light emitted from the wavelength conversion member 21 to the outside (specifically, the diffused light L1 diffused in the direction toward the surface of the excitation light diffusion layer 25 in the excitation light diffusion layer 25, and the light reflection film) Since the excitation light reflected by the light source 33 and the fluorescence emitted isotropically from the phosphor are synthesized on an average, the distribution of the excitation light in the light L2 emitted to the outside from the wavelength conversion member 21 And the distribution of fluorescence can be made substantially equal. Therefore, the excitation light emitted from the wavelength conversion member 21 can be used effectively.
  • the fluorescent member 22 has the periodic structure 23 in which the convex portions 24 are periodically arranged on the excitation light receiving surface, the non-excitation light diffusion layer portion and the excitation light diffusion layer portion are irradiated. Excitation light can be incident on the fluorescent member 22 with high efficiency. At the same time, the fluorescence generated inside the fluorescent member 22 can be extracted from the wavelength conversion member 41 to the outside with high efficiency. Furthermore, since the fluorescent member 22 has a reflective function on the back surface, the fluorescence generated inside the wavelength conversion member 41 and the light incident on the wavelength conversion member 41 and not absorbed by the phosphor Excitation light can be used with extremely high efficiency. Therefore, higher luminous efficiency can be obtained. Therefore, according to the fluorescence light source device according to FIG.
  • the fluorescence can be generated with high efficiency inside the wavelength conversion member 41 and the generated fluorescence can be emitted to the outside with high efficiency. can get.
  • the excitation light emitted from the wavelength conversion member 41 to the outside together with the fluorescence can be used without causing the adverse effect of color unevenness, the amount of light emitted from the fluorescent light source device increases. Therefore, high luminous efficiency can be obtained, and light having high uniformity without color unevenness can be obtained.
  • the excitation light diffusion layer 25 is partially arranged on the excitation light receiving surface of the fluorescent member 22, the arrangement position of the excitation light diffusion layer 25 and the thickness of the fluorescent member 22 are arranged.
  • the ratio between the fluorescence intensity and the excitation light intensity in the light L2 emitted from the wavelength conversion member 41 to the outside can be easily adjusted. Therefore, the light emitted from the fluorescent light source device can have the desired characteristics.
  • fluorescent light source device is similar to the fluorescent light source device 10 shown in FIG. 1, fluorescence and excitation light are combined and mixed to obtain light having excellent color uniformity. Can be suitably used.
  • the wavelength conversion member only needs to have an excitation light diffusion layer formed on the excitation light receiving surface on which the periodic structure of the fluorescent member is formed, and light containing fluorescence from the back surface of the wavelength conversion member, that is, the back surface of the fluorescence member.
  • emitted may be sufficient.
  • the structure of the whole fluorescence light source device is not limited to what is shown in FIG. 1, A various structure is employable.
  • the light of one laser light source for example, a laser diode
  • a condensing lens is disposed in front of the wavelength conversion member, The form which irradiates a wavelength conversion member with condensed light may be sufficient.
  • the excitation light is not limited to the light from the laser light source, and may be one that condenses the light of the LED as long as it can excite the wavelength conversion member. May be light.
  • the wavelength of the excitation light is a main radiation wavelength region emitted from the lamp or the like.
  • the present invention is not limited to this.
  • a wavelength conversion member (21) (hereinafter referred to as “a”) having an excitation light diffusion layer (25) formed on the entire surface of the fluorescent member (22) having the periodic structure (23).
  • a wavelength conversion member (also referred to as “1”) was produced.
  • the convex portion (24) has a conical shape, and the period (d) is diffraction of fluorescence emitted from the phosphor constituting the fluorescent member (22). Is the size of the range in which the occurrence occurs, and the aspect ratio is 0.5.
  • the excitation light diffusing layer (25) is made of TiO 2 in the light transmissive material (26) made of low melting point glass, and diffusing fine particles (27) having an average particle diameter of 0.7 ⁇ m are formed of the light transmissive material. (26) and the diffusion fine particles (27) are contained in a content ratio of 40% by volume with respect to 100% by volume in total. The thickness is 30 ⁇ m.
  • the light transmissive material (26) transmits excitation light and fluorescence, and the diffusion microparticle (27) diffuses excitation light.
  • wavelength conversion member (2) of the structure and specification similar to the wavelength conversion member (1) except having not formed the excitation light diffusion layer on the surface of the fluorescence member. ) was produced.
  • Fluorescence efficiency (%) fluorescence intensity (W) / excitation light absorption intensity (W)

Abstract

L'objet de la présente invention est de pourvoir à un dispositif à source de lumière fluorescente qui permette d'obtenir une efficacité lumineuse élevée et une lumière hautement uniforme sans décoloration. Le dispositif à source de lumière fluorescente selon la présente invention est équipé d'un élément de conversion de longueur d'onde comprenant un corps fluorescent excité par une lumière d'excitation, et est caractérisé en ce que l'élément de conversion de longueur d'onde comprend : un élément fluorescent qui contient le corps fluorescent et qui présente une structure régulière dans laquelle des saillies sont agencées à intervalles réguliers sur une surface de réception de lumière d'excitation ; et une couche de diffusion de lumière d'excitation qui est formée sur la surface de réception de lumière d'excitation de l'élément fluorescent.
PCT/JP2014/074093 2013-09-30 2014-09-11 Dispositif à source de lumière fluorescente WO2015045886A1 (fr)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9515239B2 (en) 2014-02-28 2016-12-06 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device and light-emitting apparatus
US9518215B2 (en) 2014-02-28 2016-12-13 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device and light-emitting apparatus
US9618697B2 (en) 2014-02-28 2017-04-11 Panasonic Intellectual Property Management Co., Ltd. Light directional angle control for light-emitting device and light-emitting apparatus
WO2017175635A1 (fr) * 2016-04-05 2017-10-12 ウシオ電機株式会社 Dispositif de source de lumière fluorescente
US9880336B2 (en) 2014-02-28 2018-01-30 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device including photoluminescent layer
US9882100B2 (en) 2015-08-20 2018-01-30 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device having surface structure for limiting directional angle of light
US9890912B2 (en) 2014-02-28 2018-02-13 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus including photoluminescent layer
US9899577B2 (en) 2015-06-08 2018-02-20 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus including photoluminescent layer
CN108139523A (zh) * 2015-10-20 2018-06-08 松下知识产权经营株式会社 波长转换元件以及发光装置
US10012780B2 (en) 2014-02-28 2018-07-03 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device including photoluminescent layer
US10031276B2 (en) 2015-03-13 2018-07-24 Panasonic Intellectual Property Management Co., Ltd. Display apparatus including photoluminescent layer
US10094522B2 (en) 2016-03-30 2018-10-09 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device having photoluminescent layer
US10115874B2 (en) 2015-06-08 2018-10-30 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device including photoluminescent layer
US10113712B2 (en) 2015-03-13 2018-10-30 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device including photoluminescent layer
US10182702B2 (en) 2015-03-13 2019-01-22 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus including photoluminescent layer
US10359155B2 (en) 2015-08-20 2019-07-23 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus
USRE49093E1 (en) 2015-03-13 2022-06-07 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus including photoluminescent layer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017003971A (ja) * 2015-06-05 2017-01-05 キヤノン株式会社 光学素子及びこれを用いた光源装置、投射型表示装置
JP2017076534A (ja) * 2015-10-15 2017-04-20 ウシオ電機株式会社 光源装置
CN113376099B (zh) * 2021-06-29 2022-12-13 安图实验仪器(郑州)有限公司 一种基于标准品的qpcr激发光强自动调整方法和系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012054084A (ja) * 2010-09-01 2012-03-15 Sharp Corp 照明装置
JP2012068465A (ja) * 2010-09-24 2012-04-05 Casio Comput Co Ltd 光源ユニット及びプロジェクタ
JP2012222050A (ja) * 2011-04-05 2012-11-12 Sharp Corp 発光装置、照明装置および前照灯
JP2013030720A (ja) * 2011-07-29 2013-02-07 Sharp Corp 発光素子、発光装置および発光素子の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012054084A (ja) * 2010-09-01 2012-03-15 Sharp Corp 照明装置
JP2012068465A (ja) * 2010-09-24 2012-04-05 Casio Comput Co Ltd 光源ユニット及びプロジェクタ
JP2012222050A (ja) * 2011-04-05 2012-11-12 Sharp Corp 発光装置、照明装置および前照灯
JP2013030720A (ja) * 2011-07-29 2013-02-07 Sharp Corp 発光素子、発光装置および発光素子の製造方法

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9518215B2 (en) 2014-02-28 2016-12-13 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device and light-emitting apparatus
US9618697B2 (en) 2014-02-28 2017-04-11 Panasonic Intellectual Property Management Co., Ltd. Light directional angle control for light-emitting device and light-emitting apparatus
US9880336B2 (en) 2014-02-28 2018-01-30 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device including photoluminescent layer
US9890912B2 (en) 2014-02-28 2018-02-13 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus including photoluminescent layer
US9515239B2 (en) 2014-02-28 2016-12-06 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device and light-emitting apparatus
US10012780B2 (en) 2014-02-28 2018-07-03 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device including photoluminescent layer
US10031276B2 (en) 2015-03-13 2018-07-24 Panasonic Intellectual Property Management Co., Ltd. Display apparatus including photoluminescent layer
USRE49093E1 (en) 2015-03-13 2022-06-07 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus including photoluminescent layer
US10182702B2 (en) 2015-03-13 2019-01-22 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus including photoluminescent layer
US10113712B2 (en) 2015-03-13 2018-10-30 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device including photoluminescent layer
US10115874B2 (en) 2015-06-08 2018-10-30 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device including photoluminescent layer
US9899577B2 (en) 2015-06-08 2018-02-20 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus including photoluminescent layer
US9882100B2 (en) 2015-08-20 2018-01-30 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device having surface structure for limiting directional angle of light
US10359155B2 (en) 2015-08-20 2019-07-23 Panasonic Intellectual Property Management Co., Ltd. Light-emitting apparatus
CN108139523A (zh) * 2015-10-20 2018-06-08 松下知识产权经营株式会社 波长转换元件以及发光装置
US10094522B2 (en) 2016-03-30 2018-10-09 Panasonic Intellectual Property Management Co., Ltd. Light-emitting device having photoluminescent layer
WO2017175635A1 (fr) * 2016-04-05 2017-10-12 ウシオ電機株式会社 Dispositif de source de lumière fluorescente

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