JP2014179231A - Light source device and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which enables a phosphor light emitting section to emit light with high efficiency while achieving low costs, and to provide a lighting device.SOLUTION: A lighting device 1-1 according to one embodiment includes a light source device 2-1. The light source device 2-1 is composed of a light source part 10 which radiates excitation light and a phosphor light emitting section 20-1 where light is produced by the excitation light. The phosphor light emitting section 20-1 includes a light emitting section 21-1, a heat radiation member 22, and a resin-based seal material 23. The light emitting section 21-1 is composed of a reflection layer 25 and a phosphor layer 24-1 laminated on the reflection layer 25. The reflection layer 25 of the light emitting section 21-1 is joined to the heat radiation member 22 by the resin-based seal material 23.

Description

  Embodiments described herein relate generally to a light source device and an illumination device.

  Conventionally, a light source device (for example, see Patent Document 1) in which a light source unit such as an LED and a phosphor light emitting unit that emits light by excitation light from the light source unit is used. The light source device is combined with a reflector, a lens, or the like to constitute an illumination device.

JP 2011-129354 A

  By the way, in a light source device in which a light source unit and a phosphor light emitting unit are combined, it is desired that the phosphor light emitting unit can emit light with high efficiency while reducing costs.

  The objective of this invention is providing the light source device and illuminating device which a fluorescent substance light emission part can light-emit with high efficiency, aiming at cost reduction.

  The light source device of the embodiment includes a light source unit that emits excitation light and a phosphor light-emitting unit that emits light by the excitation light. The phosphor light emitting unit includes a light emitting unit, a heat radiating member, and a resin-based sealing material. The light emitting unit includes a phosphor layer and a reflective layer laminated on the phosphor layer. The reflective layer of the light emitting unit is joined to the heat dissipation member and a resin sealant.

  According to the present invention, the phosphor light emitting section can emit light with high efficiency while achieving cost reduction.

FIG. 1 is a cross-sectional view schematically showing a schematic configuration of the illumination device according to the first embodiment. FIG. 2 is an exploded perspective view showing a schematic configuration of the light source device according to the first embodiment. FIG. 3 is a cross-sectional view schematically showing a schematic configuration of the illumination device according to the second embodiment. FIG. 4 is an exploded perspective view showing a schematic configuration of the light source device according to the second embodiment. FIG. 5 is a cross-sectional view schematically showing a schematic configuration of the illumination device according to the third embodiment.

  The light source devices 2-1, 2-2, 2-3 according to the embodiments described below include a light source unit 10 that emits excitation light and phosphor light emitting units 20-1, 20-2 that emit light by excitation light. , 20-3. The phosphor light emitting units 20-1, 20-2 and 20-3 include light emitting units 21-1, 21-2 and 21-3, a heat radiating member 22, and a resin-based sealing material 23. The light emitting units 20-1, 20-2, and 21-3 include a reflection layer 25 and phosphor layers 24-1, 24-2 and 24-3 stacked on the reflection layer 25. The reflection layers 25 of the light emitting units 21-1, 21-2, and 21-3 are joined to the heat radiating member 22 by a resin-based sealing material 23.

  Further, in the light source devices 2-1 and 2-3 according to the embodiments described below, the phosphor layers 24-1 and 24-3 are composed of ceramics 27 and the phosphor 26 laminated on the ceramics 27. It is configured.

  In the light source devices 2-1 and 2-3 according to the embodiments described below, the transmittance of the ceramic 27 is 65% or more and less than 100%.

  Further, in the light source devices 2-1 and 2-3 according to the embodiments described below, when the thickness of the phosphor 26 is A and the thickness of the ceramics 27 is B, 0.013 ≦ A / B ≦ 1. Meet.

  In the light source device 2-2 according to the embodiment described below, the phosphor layer 24-2 is phosphor ceramics.

  In the light source devices 2-1, 2-2, and 2-3 according to the embodiments described below, the reflectance of the reflective layer 25 is 80% or more and less than 100%.

  Illumination devices 1-1, 1-2, and 1-3 according to embodiments described below include light source devices 2-1, 2-2, and 2-3.

[First Embodiment]
Next, the light source device 2-1 and the illumination device 1-1 according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing a schematic configuration of the illumination device according to the first embodiment, and FIG. 2 is an exploded perspective view showing a schematic configuration of the light source device according to the first embodiment.

  The illuminating device 1-1 of 1st Embodiment shown by FIG. 1 is used for general illumination, a spotlight, vehicle-mounted illumination etc., for example. The illuminating device 1-1 is provided with the light source device 2-1, as shown in FIG.

  As shown in FIG. 1, the light source device 2-1 includes a light source unit 10 that emits excitation light and a phosphor light emitting unit 20-1 that emits light by excitation light emitted from the light source unit 10. The light source unit 10 emits excitation light and has at least a semiconductor light emitting element or the like as excitation light generation means. The semiconductor light emitting element can be, for example, a laser element that emits excitation light in a wavelength range of 400 nm to 490 nm, a light emitting diode, or the like. The wavelength range of the excitation light only needs to be absorbed by the phosphor light emitting unit 20-1 and emit wavelength-converted light. By combining with the phosphor light emitting unit 20-1, ultraviolet light having a wavelength of 400 nm or less, or light having a wavelength of 500 nm or more can be used. You can also The light source unit 10 may further include a light guide (not shown) such as an optical fiber, and may emit after transmitting the excitation light from the semiconductor light emitting element 10.

  As shown in FIGS. 1 and 2, the phosphor light emitting unit 20-1 includes a light emitting unit 21-1, a heat radiating member 22, and a resin-based sealing material 23. The light emitting unit 21-1 includes a reflective layer 25 and a phosphor layer 24-1 laminated on the reflective layer 25.

The phosphor layer 24-1 is excited by light having a predetermined wavelength of excitation light emitted from the light source unit 10, and transmits light having a wavelength other than the predetermined wavelength. The phosphor layer 24-1 includes a ceramic 27 and a phosphor 26 laminated on the ceramic 27. The phosphor 26 is excited by light having a predetermined wavelength of excitation light emitted from the light source unit 10 and emits light having a wavelength longer than the predetermined wavelength. Excitation light from the light source unit 10 is emitted to the phosphor 26. The phosphor 26 is laminated on the surface 27 a of the ceramic 27 by applying the phosphor powder together with the water-soluble binder to the surface 27 a of the ceramic 27 and volatilizing the water-soluble binder. The thickness A of the phosphor 26 is preferably 0.1 mm or less, for example, about 0.05 mm. As the phosphor powder constituting the phosphor 26, for example, Lu ₃ Al ₅ O ₁₂ : Ce as a phosphor emitting green light and a phosphor CaAlSiN ₃ : Eu emitting red light are mixed at a predetermined blending ratio. With this configuration, white light can be emitted by blue excitation light. In addition, nitride-based phosphors such as (Ca, Sr) ₂ Si ₅ N ₈ : Eu, (Ca, Sr) AlSiN ₃ : Eu, Cax (Si, Al) ₁₂ (O, N) ₁₆ : Eu, (Si, Al) ₆ (O, N) ₈ : Eu, BaSi ₂ O ₂ N ₂ : Eu, BaSi ₂ O ₂ N ₂ : Eu and other oxynitride phosphors, (Y, Gd) ₃ (Al , Ga) ₅ O ₁₂ : Ce, (Sr, Ba) ₂ SiO ₄ : Eu, Ca ₃ Sc ₂ Si ₃ O ₁₂ : Ce, Sr ₄ Al ₁₄ O ₂₅ : Eu, and other oxide-based phosphors (Ca , Sr) Sulfur-based phosphors such as S: Eu, CaGa ₂ S ₄ : Eu, ZnS: Cu, and Al can also be used.

The phosphor 26 may have a configuration in which phosphor powder and, for example, frit glass are mixed. The frit glass has, for example, a composition ratio (molar percentage) of B ₂ O _{3 of} 10 to 30%, Al ₂ O ₃ of 15 to 35%, SiO ₂ of 15 to 35%, and Bi ₂ O ₃ of 20 to 40%. It is a glass composition to contain. In addition, other components can be added as necessary. When baking is performed at a temperature of 500 to 600 ° C. after the drying process of the phosphor 26, the frit glass is melted and the binding force between the phosphor powders can be increased.

  The ceramic 27 is made of transparent or white so-called fine ceramics, and is formed in a flat plate shape. The ceramics 27 transmits light of the excitation light emitted from the light source unit 10 other than the predetermined wavelength. The excitation light transmittance of the ceramic 27 is 65% or more and less than 100%. Since the reflection layer 25 reflects a part of the excitation light transmitted through the ceramic 27 and the light emitted from the phosphor 26 and returns the light to the phosphor 26 again, the transmittance of the ceramic 27 is closer to 100%. preferable. If the transmittance of the ceramic 27 is 65% or less, a part of the transmitted excitation light or the light emitted from the phosphor 26 is absorbed in the ceramic 27, and the contribution ratio of the light emitted to the phosphor 26 is reduced. . The transmittance is a value obtained by dividing the radiation divergence of light emitted from the ceramic 27 by the radiation divergence of light incident on the ceramic 27 and multiplying by 100.

  In addition, the ceramic 27 transmits heat generated by the light emitting portion 21-1 to the heat radiating member 22 when the phosphor 26 emits light or when light is transmitted through the ceramic 27 itself. The thickness B of the ceramic 27 is desirably as thin as possible in order to increase the transmittance of excitation light and the conductivity of heat, and is desirably formed to be 0.8 mm or less, for example, about 0.2 mm.

  The ceramic 27 is made of at least one of yttrium, aluminum, garnet, aluminum oxide, yttrium oxide, magnesium oxide, and the like.

  Further, the light source device 1-1 of the first embodiment satisfies the relationship of the following formula 1 when the thickness of the phosphor 26 is A and the thickness of the ceramic 27 is B.

  0.013 ≦ A / B ≦ 1 (Formula 1)

  When A / B is less than 0.013, the thermal resistance of the phosphor layer 24-1 becomes too large, which is not preferable. When A / B is more than 1, the mechanical strength of the ceramic 27 is lowered, and fluorescence is increased. The body 26 may be damaged during molding. This is because when A / B is 0.013 or more and 1 or less, an increase in the thermal resistance of the phosphor layer 24-1 can be suppressed without damaging the ceramic 27.

  The reflection layer 25 reflects the light having the wavelength transmitted through the phosphor layer 24-1. The reflective layer 25 is laminated on the back surface 27 b of the ceramic 27. The reflective layer 25 is laminated by plating or vapor-depositing metal or the like on the back surface 27 b of the ceramic 27. The reflectance of the reflective layer 25 is 80% or more and less than 100%. If the reflectance is less than 80%, the amount of light applied to the front surface is decreased, which is not preferable. If the reflectance is 80% or more and less than 100%, the front surface can be irradiated with sufficient light, and light to heat is changed. Since conversion can also be suppressed, it is preferable. The reflectance is a value obtained by dividing the luminous flux of light reflected by the surface of the reflective layer 25 by the luminous flux of light incident on the surface of the reflective layer 25 and multiplying by 100.

  As the metal constituting the reflective layer 25, at least one metal of Ag, Al, Cr, Ni, and Pt can be used.

  The heat dissipating member 22 dissipates heat conducted from the ceramics 27, that is, heat generated by the light emitting unit 21-1. The heat radiating member 22 is formed in a flat plate shape and is made of a metal substrate, oxide ceramics, non-oxide ceramics, or the like, but it is desirable to use a metal substrate having particularly high heat conduction characteristics and workability. As the metal constituting the heat radiating member 22, one or more metals among Al, Cu, Ti, Si, Ag, Au, Ni, Mo, W, Fe, Pd, and Nb can be used.

  Further, the reflective layer 25 of the light emitting unit 21-1 is joined by the heat radiating member 22 and the resin sealant 23. The resin-based sealing material 23 is preferably composed of a silicone-based, epoxy-based, or acrylic-based adhesive that cures at room temperature. In addition, as the resin-based sealing material 23, a phenol-based, polyurethane-based, polycarbonate-based adhesive, or the like can also be used.

  The phosphor light emitting unit 20-1 of the light source device 2-1 according to the first embodiment is manufactured as follows. First, the reflective layer 25 is formed by evaporating or plating one or more of the metals described above on the back surface 27b of the ceramic 27 formed in a flat plate shape having a predetermined thickness B. Thereafter, one or more of the phosphor powders described above are added to a water-soluble binder and applied to the surface 27 a of the ceramic 27. For example, the water-soluble binder is volatilized by heating up to about 120 degrees Celsius, and the phosphor powder is fixed on the surface 27 a of the ceramic 27 to form the phosphor 26 on the surface 27 a of the ceramic 27. Then, the reflective layer 25, that is, the light emitting part 21-1 and the heat radiating member 22 are joined by the resin sealant 23. The phosphor light emitting unit 20-1 manufactured in this way is combined with the light source unit 10 and the like to constitute the light source device 2-1.

  As shown in FIG. 1, the light source device 2-1 is combined with a reflector 30 that reflects light emitted from the light source device 2-1, a lens 40 that passes light reflected by the reflector 30, and the like. 1-1. In the illumination device 1-1, excitation light from the light source unit 10 is emitted to the phosphor light emitting unit 20-1, and the phosphor 26 of the phosphor layer 24-1 emits light having a predetermined wavelength out of the excitation light. And is emitted toward the lens 40, and light having a wavelength other than a predetermined wavelength is reflected by the reflective layer 25 and emitted from the phosphor 26 toward the lens 40. The light from the phosphor light emitting unit 20-1 is reflected by the reflector 30, guided to the lens 40, and radiated to the outside through the lens 40. Thus, the illumination device 1-1 emits illumination light.

  According to the light source device 2-1 of the first embodiment, since the light emitting unit 21-1 is joined to the heat radiating member 22 by the resin sealant 23, when the light emitting unit 21-1 is joined to the heat radiating member 22. Moreover, it can suppress that a heat | fever acts on the reflection layer 25 of the light emission part 21-1. Therefore, the oxidation of the reflective layer 25 can be suppressed, the reflectance of the reflective layer 25 can be suppressed from decreasing, and the phosphor light emitting unit 20-1 can emit light with high efficiency.

  Further, since the reflective layer 25 of the light emitting unit 21-1 is joined to the heat radiating member 22 by the resin-based sealing material 23, the excitation light from the light source unit 10 is reflected by the reflective layer 25 and acts on the resin-based sealing material 23. Can be suppressed. For this reason, it can suppress that excitation light acts on the resin-type sealing material 23, and the resin-type sealing material 23 deteriorates. Therefore, since the light emitting part 21-1 and the heat radiating member 22 can be joined by the resin-based sealing material 23, the cost can be reduced. Therefore, in the light source device 2-1, the phosphor light emitting unit 20-1 can emit light with high efficiency while achieving cost reduction.

  In the light source device 2-1, since the phosphor layer 24-1 is composed of the phosphor 26 and the ceramic 27, the heat generated by the excitation light from the light source unit 10 is smoothly supplied to the heat radiating member 22 through the ceramic 27. Can be transmitted, and heat dissipation can be improved.

  Further, in the light source device 2-1, since the phosphor layer 24-1 is composed of the phosphor 26 and the ceramic 27, the contraction when the phosphor 26 is stacked on the surface 27 a of the ceramic 27 is reflected by the reflection layer. The ceramic 27 can suppress the transmission to 25. Therefore, the reflection layer 25 can be prevented from being damaged when the phosphors 26 are stacked, and the excitation light from the light source unit 10 acts on the resin-based sealing material 23 to reliably suppress the deterioration of the resin-based sealing material 23. it can.

  In the light source device 2-1, since the transmittance of the ceramic 27 is 65% or more and less than 100%, the excitation light from the light source unit 10 is reflected by the reflection layer 25 without being attenuated as much as possible and radiated to the outside. be able to. Therefore, the phosphor light emitting unit 20-1 can emit light with higher efficiency.

  In the light source device 2-1, since the thickness A of the phosphor 26 and the thickness B of the ceramic 27 satisfy 0.013 ≦ A / B ≦ 1, the phosphor layer 24-1 is not damaged without damaging the ceramic 27. This is because an increase in thermal resistance can be suppressed.

  In the light source device 2-1, since the reflectance of the reflective layer 25 is 80% or more and less than 100%, it is possible to suppress the excitation light from the light source unit 10 from acting on the resin sealant 23, and the resin seal Deterioration of the material 23 can be suppressed.

  Since the illuminating device 1-1 includes the light source device 2-1, the phosphor light emitting unit 20-1 can emit light with high efficiency while achieving cost reduction.

[Second Embodiment]
Next, a light source device 2-2 and a lighting device 1-2 according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional view schematically showing a schematic configuration of the illumination device according to the second embodiment, and FIG. 4 is an exploded perspective view showing a schematic configuration of the light source device according to the second embodiment. 3 and 4, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the light source device 2-2 of the illumination device 1-2 according to the second embodiment, the phosphor layer 24-2 of the light emitting unit 21-2 of the phosphor light emitting unit 20-2 is made of phosphor ceramics. The phosphor ceramic does not include a binding member such as a resin in which phosphor powder is dispersed in glass or a glass phosphor in which a luminescent center ion is added to a glass matrix. As the phosphor powder dispersed in the glass, for example, Lu ₃ Al ₅ O ₁₂ : Ce as a phosphor emitting green light and a phosphor CaAlSiN ₃ : Eu emitting red light are mixed in a predetermined mixing ratio. With this configuration, white light can be emitted by blue excitation light. In addition, nitride-based phosphors such as (Ca, Sr) ₂ Si ₅ N ₈ : Eu, (Ca, Sr) AlSiN ₃ : Eu, Cax (Si, Al) ₁₂ (O, N) ₁₆ : Eu, (Si, Al) ₆ (O, N) ₈ : Eu, BaSi ₂ O ₂ N ₂ : Eu, BaSi ₂ O ₂ N ₂ : Eu and other oxynitride phosphors, (Y, Gd) ₃ (Al , Ga) ₅ O ₁₂ : Ce, (Sr, Ba) ₂ SiO ₄ : Eu, Ca ₃ Sc ₂ Si ₃ O ₁₂ : Ce, Sr ₄ Al ₁₄ O ₂₅ : Eu, and other oxide-based phosphors (Ca , Sr) Sulfur-based phosphors such as S: Eu, CaGa ₂ S ₄ : Eu, ZnS: Cu, and Al can also be used. Moreover, glass containing components such as P ₂ O ₃ , SiO ₂ , B ₂ O ₃ , Al ₂ O ₃ , Bi ₂ O ₃ can be used as the glass in which the phosphor powder is dispersed.

In addition, as a glass phosphor in which a luminescent center ion is added to a glass matrix, Ca 3 —Si—Al—O—N or Y—Si—Al—O—N in which Ce ³⁺ , Eu ²⁺ is added as an activator is used. An oxynitride glass fluorescent material such as a glass system can be used. The phosphor ceramic is preferably a sintered body having a phosphor composition having the above-described composition, substantially free of a resin component, and having translucency.

  The phosphor light emitting unit 20-2 of the light source device 2-2 of the second embodiment is manufactured as follows. First, one or more phosphor powders among the phosphor powders described above are dispersed in glass together with an organic binder and sintered to volatilize the organic binder to form a phosphor layer 24-2 having a predetermined shape. . Thereafter, the reflective layer 25 is formed on the phosphor layer 24-2 by evaporating or plating one or more metals among the metals described above. Then, the reflective layer 25, that is, the light emitting part 21-2 and the heat radiating member 22 are joined by the resin sealant 23.

  In the illumination device 1-2 according to the second embodiment, the phosphor powder of the phosphor layer 24-2 converts light having a predetermined wavelength out of excitation light emitted from the light source unit 10 into light having a long wavelength. While emitting light toward 40, light having a wavelength other than the predetermined wavelength is reflected by the reflection layer 25 and emitted from the phosphor layer 24-2 toward the lens 40. Then, the light from the phosphor light emitting unit 20-2 is reflected by the reflector 30, guided to the lens 40, and radiated to the outside through the lens 40. Thus, the illumination device 1-2 emits illumination light.

  Similarly to the first embodiment, the light source device 2-2 and the illumination device 1-2 according to the second embodiment allow the phosphor light emitting unit 20-2 to emit light with high efficiency while reducing costs. it can.

  Further, in the light source device 2-2 of the second embodiment, since the phosphor layer 24-2 is phosphor ceramic, the phosphor layer 24-2 can be easily manufactured, and further cost reduction is achieved. be able to.

[Third Embodiment]
Next, a light source device 2-3 and an illumination device 1-3 according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a cross-sectional view schematically showing a schematic configuration of the illumination device according to the third embodiment. In FIG. 5, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The phosphor light emitting unit 20-3 of the light source device 2-3 of the illumination device 1-3 of the third embodiment is similar to the first embodiment in the light emitting unit 21-3, the heat dissipation member 22, and the resin system. The light emitting unit 21-3 includes a reflective layer 25 and a phosphor layer 24-3. In the light source device 2-3 of the illumination device 1-3 according to the third embodiment, the light source unit 10 further includes a light guide 10b such as an optical fiber, and pumps the excitation light from the semiconductor light emitting element 10a. And is emitted toward the phosphor light emitting unit 20-3.

  In the light source device 2-3 and the illumination device 1-3 according to the third embodiment, the phosphor light emitting unit 20-2 emits light with high efficiency while achieving cost reduction, as in the first embodiment. it can.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments are included in the invention described in the claims and the equivalents thereof, as well as included in the scope and gist of the invention.

1-1, 1-2, 1-3 Illumination device 2-1, 2-2, 2-3 Light source device 10 Light source unit 10a Semiconductor light emitting element 10b Light guide 20-1, 20-2, 20-3 Phosphor Light-emitting part 21-1, 21-2, 21-3 Light-emitting part 22 Heat radiation member 23 Resin-based sealing material 24-1, 24-2, 24-3 Phosphor layer 25 Reflective layer 26 Phosphor 27 Ceramic 27a Surface 27b Back 30 Reflector 40 lens

Claims (7)

In a light source device including a light source unit that emits excitation light and a phosphor light emitting unit that emits light by the excitation light,
The phosphor light emitting unit is
A light-emitting portion comprising a reflective layer and a phosphor layer laminated on the reflective layer;
A heat dissipating member that dissipates heat generated by the light emitting unit;
A light source device comprising: a resin-based sealing material that joins the reflective layer and the heat dissipation member. The light source device according to claim 1, wherein the phosphor layer is composed of ceramics and a phosphor laminated on the ceramics. The light source device according to claim 2, wherein a transmittance of the ceramic is 65% or more and less than 100%. 4. The light source device according to claim 2, wherein when the thickness of the phosphor is A and the thickness of the ceramic is B, 0.013 ≦ A / B ≦ 1 is satisfied. The light source device according to claim 1, wherein the phosphor layer is phosphor ceramic. The light source device according to any one of claims 1 to 5, wherein a reflectance of the reflective layer is 80% or more and less than 100%.   The illuminating device provided with the light source device as described in any one of Claims 1-6.

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