WO2022025065A1 - 発光装置及び照明装置 - Google Patents
発光装置及び照明装置 Download PDFInfo
- Publication number
- WO2022025065A1 WO2022025065A1 PCT/JP2021/027764 JP2021027764W WO2022025065A1 WO 2022025065 A1 WO2022025065 A1 WO 2022025065A1 JP 2021027764 W JP2021027764 W JP 2021027764W WO 2022025065 A1 WO2022025065 A1 WO 2022025065A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light emitting
- light
- wiring
- emitting device
- emitting element
- Prior art date
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S4/00—Lighting devices or systems using a string or strip of light sources
- F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
- F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
-
- 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]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
Definitions
- This disclosure relates to a light emitting device and a lighting device.
- a light emitting device having a reflective layer on the surface of a substrate on which a light emitting element is mounted is known (see, for example, Patent Document 1).
- the light emitting device includes a substrate having a feeding wiring and a feeding pad electrically connected to each other, and a reflective layer located on the feeding wiring so as to cover at least a part of the feeding wiring. It includes a light emitting element that is electrically connected to the power feeding wiring via the feeding pad and emits excitation light, and a wavelength conversion member that is located above the light emitting element and converts the excitation light into illumination light.
- the light emitting element is located on the feeding pad so as to cover the feeding pad having an electrical connection relationship in the plan view of the substrate.
- the lighting device includes at least one light emitting device.
- FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a plan perspective view of the light emitting device of FIG. It is an enlarged view of the one-dot chain line surrounding part of FIG. It is sectional drawing of the structural example of the substrate in which the light emitting element is mounted by the flip chip junction. It is a top view of the configuration example in which the light emitting element is larger than the power feeding pad. It is a top view of the configuration example in which the reflective layer covers a substrate. It is a perspective view which shows the structural example of the lighting apparatus which concerns on one Embodiment.
- the light emitting device 10 includes an element substrate 2, a light emitting element 3, and a wavelength conversion member 6.
- the light emitting device 10 is not essential, but further includes a frame member 4.
- the light emitting element 3 is mounted on the element substrate 2.
- the wavelength conversion member 6 is located above the light emitting element 3.
- the light emitting device 10 emits light obtained by converting the light emitted by the light emitting element 3 by the wavelength conversion member 6.
- the light emitting element 3 emits light having a peak wavelength in a wavelength region of 360 nm or more and 430 nm or less.
- the wavelength region of 360 nm or more and 430 nm or less is also referred to as a purple light region.
- the wavelength conversion member 6 converts the light incident on the wavelength conversion member 6 from the light emitting element 3 into light having a peak wavelength in the wavelength region of 360 nm or more and 780 nm or less, and emits the converted light.
- the wavelength region of 360 nm or more and 950 nm or less is also referred to as a visible light region.
- the visible light region is assumed to include a purple light region.
- Visible light is assumed to include purple light.
- the wavelength conversion member 6 emits a peak wavelength region into a visible light region by being excited by the light emitted by the light emitting element 3.
- the light emitted by the light emitting element 3 is also referred to as excitation light.
- the light emitting element 3 included in the light emitting device 10 is also referred to as an excitation light emitting element.
- the element substrate 2 is also simply referred to as a substrate.
- the element substrate 2 may be formed of, for example, a material having an insulating property.
- the element substrate 2 may be formed of, for example, a ceramic material such as aluminum oxide (alumina) or mullite, a glass ceramic material, or a composite material obtained by mixing a plurality of these materials.
- the element substrate 2 may be formed of a polymer resin material or the like in which metal oxide fine particles capable of adjusting thermal expansion are dispersed.
- the element substrate 2 may be configured to contain aluminum nitride or silicon carbide (silicon carbide). As a result, the thermal conductivity of the element substrate 2 can be improved, and the heat dissipation performance of the light emitting device 10 is improved.
- the element substrate 2 has an upper surface 2A facing the positive direction of the Z axis.
- the light emitting element 3 is mounted on the upper surface 2A of the element substrate 2.
- the element substrate 2 includes a first wiring 31 on the upper surface 2A for electrically conducting a component such as a light emitting element 3.
- the first wiring 31 may be made of a conductive material such as tungsten, molybdenum, manganese, or copper.
- a metal paste obtained by adding an organic solvent to tungsten powder is printed on a ceramic green sheet to be an element substrate 2 in a predetermined pattern, and a plurality of ceramic green sheets are laminated and fired. May be formed by.
- the first wiring 31 may include a plating layer such as nickel or gold formed on the surface thereof for oxidation prevention.
- the first wiring 31 is also referred to as a power feeding wiring.
- the element substrate 2 further includes a reflective layer 40 located on the first wiring 31.
- the reflective layer 40 is located on the first wiring 31 so as to cover at least a part of the first wiring 31.
- the reflective layer 40 may be formed of, for example, a material obtained by adding a white material such as titanium oxide to a material based on a silicone resin.
- the reflective layer 40 is not limited to this example, and may be formed so that the reflectance of the reflective layer 40 is higher than the reflectance of the first wiring 31.
- the upper surface 2A of the element substrate 2 includes a first region 21 in which the first wiring 31 is located and a second region 22 around the first region 21.
- the first region 21 has a circular shape, but may have various other shapes.
- the element substrate 2 further includes a second wiring 32 located in the second region 22 of the upper surface 2A.
- the second wiring 32 electrically connects the external power supply and the power feeding pad 33.
- the second wiring 32 includes a first portion 321 located surrounding the first region 21 in which the first wiring 31 is located, and a second portion 322 extending from the first portion 321 so as to connect to an external power source. And have.
- the second wiring 32 is also collectively referred to as a power feeding wiring together with the first wiring 31.
- the power feeding wiring may include the first wiring 31 and the second wiring 32.
- the reflective layer 40 may be located on the second wiring 32 so as to cover at least a part of the second wiring 32.
- the feeding wiring may have a third wiring 35 that connects the second wiring 32 and the feeding pad 33.
- the third wiring 35 is partially covered with the reflective layer 40. Further, the third wiring 35 may be completely covered with the reflective layer 40 or may be partially exposed. Further, the third wiring 35 is partially covered with a frame member 4 described later.
- the light emitting element 3 is an LED (Light Emission Diode).
- An LED emits light to the outside by recombination of electrons and holes in a PN junction in which a P-type semiconductor and an N-type semiconductor are bonded.
- the light emitting element 3 is not limited to the LED, and may be another light emitting device.
- the light emitting element 3 is mounted on the upper surface 2A of the element substrate 2.
- the light emitting element 3 is electrically connected to the upper surface 2A of the element substrate 2 and to the power feeding pad 33 provided so as to be electrically connected to the first wiring 31 via, for example, a brazing material or solder. Ru.
- the light emitting element 3 is located on the feeding pad 33 so as to cover at least a part of the feeding pad 33 in the plan view of the upper surface 2A of the element substrate 2.
- the feeding pad 33 may be made of the same or similar material as the first wiring 31.
- the power feeding pad 33 may be integrally formed with the first wiring 31. At this time, the light emitting element 3 may be larger than the feeding pad 33 in planar fluoroscopy.
- the power feeding pads 33 are installed as a set of two so as to be connected to the positive and negative electrodes of the light emitting element 3.
- the power feeding pad 33 may be wider than other parts.
- the first wiring 31 electrically connects the positive electrode of one set of feeding pads 33 and the negative electrode of another set of feeding pads 33.
- the light emitting element 3 is mounted on the power feeding pad 33, the light emitting element 3 is electrically connected in series by the first wiring 31.
- one series electric circuit is formed in which a plurality of light emitting elements 3 are connected in series.
- the first wiring 31 is arranged so that a plurality of electric circuits in series are formed on the element substrate 2.
- Each of the plurality of series electric circuits can be supplied with electric power from a power source by being connected to the second wiring 32 at both ends. That is, the electric circuits in series are electrically connected in parallel between the second wiring 32.
- the light emitting element 3 may be mounted so as to be electrically connected to a power feeding pad 33 located on the element substrate 2 via a solder material 34 such as a solder ball or a solder paste. .. That is, the light emitting element 3 may be mounted on the element substrate 2 by flip-chip bonding. When the light emitting element 3 is mounted by flip-chip bonding, the solder material 34 for electrically connecting to the power feeding pad 33 is located so as to be covered with the light emitting element 3 in the plan view of the upper surface 2A of the element substrate 2. ..
- the excitation light emitted from the light emitting element 3 or the illumination light converted by the wavelength conversion member 6 is less likely to enter the solder material 34. This makes it difficult for the element substrate 2 to absorb the excitation light or the illumination light. As a result, the luminous efficiency of the light emitting device 10 can be further improved.
- the light emitting element 3 when the light emitting element 3 is mounted on the element substrate 2 by wire bonding, at least a part of the wire is not covered by the light emitting element 3. In this case, the excitation light or the illumination light may be absorbed by the wire.
- the light emitting element 3 is mounted on the element substrate 2 by flip-chip bonding, so that the excitation light or the illumination light is less likely to be absorbed than the wire bonding as in the comparative example. As a result, the luminous efficiency of the light emitting device 10 can be further improved.
- the number of light emitting elements 3 mounted on the upper surface 2A of the element substrate 2 is 3, but is not particularly limited, and may be 2 or less, or 4 or more. You may.
- the light emitting element 3 In the plan view of the upper surface 2A of the element substrate 2, the light emitting element 3 is located inside the frame member 4. When the number of light emitting elements 3 is two or more, the light emitting elements 3 are positioned so as not to overlap each other in the plan view of the upper surface 2A.
- the light emitting element 3 may include a translucent substrate and an optical semiconductor layer formed on the translucent substrate.
- the translucent substrate contains a material on which an optical semiconductor layer can be grown by using, for example, a chemical vapor deposition method such as an organic metal vapor phase growth method or a molecular beam epitaxial growth method.
- the translucent substrate may be formed of, for example, sapphire, gallium nitride, aluminum nitride, zinc oxide, zinc selenium, silicon carbide (silicon carbide), silicon (Si), zirconium dibodium or the like.
- the thickness of the translucent substrate may be, for example, 50 ⁇ m or more and 1000 ⁇ m or less.
- the optical semiconductor layer may include a first semiconductor layer formed on a translucent substrate, a light emitting layer formed on the first semiconductor layer, and a second semiconductor layer formed on the light emitting layer.
- the first semiconductor layer, the light emitting layer, and the second semiconductor layer are, for example, a group III nitride semiconductor, a group III-V semiconductor such as gallium phosphorus or gallium arsenide, or a group III such as gallium nitride, aluminum nitride or indium nitride. It may be formed of a nitride semiconductor or the like.
- the thickness of the first semiconductor layer may be, for example, 1 ⁇ m or more and 5 ⁇ m or less.
- the thickness of the light emitting layer may be, for example, 25 nm or more and 150 nm or less.
- the thickness of the second semiconductor layer may be, for example, 50 nm or more and 600 nm or less.
- the frame member 4 may be made of a ceramic material such as aluminum oxide, titanium oxide, zirconium oxide or yttrium oxide.
- the frame member 4 may be made of a porous material.
- the frame member 4 may be formed of a resin material mixed with a powder containing a metal oxide such as aluminum oxide, titanium oxide, zirconium oxide or yttrium oxide.
- the frame member 4 is not limited to these materials, and may be made of various materials.
- the frame member 4 may be connected to the upper surface 2A of the element substrate 2 via, for example, a resin, a brazing material, a solder, or the like, or may be connected by using the adhesiveness of the frame member 4.
- the frame member 4 is provided on the upper surface 2A of the element substrate 2 so as to surround the light emitting element 3 at a distance from the light emitting element 3.
- the inner wall surface of the frame member 4 functions as a reflecting surface that reflects the light emitted by the light emitting element 3.
- the inner wall surface of the frame member 4 includes, for example, a metal layer formed of a metal material such as tungsten, molybdenum, or manganese, and a plating layer covering the metal layer and formed of a metal material such as nickel or gold. It's fine.
- the plating layer reflects the light emitted by the light emitting element 3.
- the inner wall surface of the frame member 4 may be along the end of the first region 21 of the upper surface 2A of the element substrate 2 in a plan view.
- the inner wall surface of the frame member 4 is assumed to have a circular shape along the end portion of the first region 21. Since the shape of the inner wall surface is circular, the frame member 4 can reflect the light emitted from the light emitting element 3 substantially uniformly upward.
- the frame member 4 may be located on the second region 22 of the upper surface 2A of the element substrate 2.
- the frame member 4 has an upper surface 4A.
- the upper surface 4A includes an upwardly convex curved surface. Since the upper surface 4A includes an upwardly convex curved surface, the illumination light converted by the wavelength conversion member 6 tends to be directed upward (in the positive direction of the Z axis).
- the frame member 4 may be configured to include the same material as the material constituting the reflective layer 40. By doing so, the difference between the refractive index of the frame member 4 and the refractive index of the reflective layer 40 can be reduced. As a result, problems such as refraction of light between the frame member 4 and the reflective layer 40 are less likely to occur. Further, the frame member 4 may be configured so that the viscosity of the frame member 4 is higher than the viscosity of the reflective layer 40. By doing so, the frame member 4 can easily dam the wavelength conversion member 6. The viscosity can be specified from the analysis of the component concentration, the viscoelasticity measurement, and the like. Further, the frame member 4 may completely cover the first portion 321 of the second wiring 32.
- the excitation light or the illumination light incident on the second wiring 32 is reduced.
- the incident light it becomes difficult for the light to be absorbed by the second wiring 32.
- the luminous efficiency of the light emitting device 10 can be further improved.
- the wavelength conversion member 6 is filled in a space surrounded by an inner wall surface of the frame member 4 on the upper surface 2A of the element substrate 2.
- the frame member 4 surrounds the wavelength conversion member 6 and is in contact with the wavelength conversion member 6.
- the wavelength conversion member 6 may be filled so that its upper surface is flush with the upper surface 4A of the frame member 4.
- the wavelength conversion member 6 seals the light emitting element 3 by filling the space above the light emitting element 3.
- the excitation light emitted from the light emitting element 3 directly incidents on the wavelength conversion member 6.
- the wavelength conversion member 6 converts purple light as incident excitation light into light having a peak wavelength included in a wavelength region of 360 nm or more and 780 nm or less, and emits the converted light.
- the wavelength conversion member 6 may include a translucent member 60 having translucency and a phosphor 61.
- the translucent member 60 may be formed of, for example, a light-transmitting insulating resin material such as a fluororesin, a silicone resin, an acrylic resin or an epoxy resin, or a light-transmitting glass material.
- the refractive index of the translucent member 60 may be set to, for example, 1.4 or more and 1.6 or less.
- the phosphor 61 is contained inside the translucent member 60.
- the phosphor 61 may be substantially uniformly dispersed inside the translucent member 60.
- the phosphor 61 converts the incident purple light into light having various peak wavelengths.
- the phosphor 61 may convert the violet light into light specified in the spectrum having a peak wavelength in the wavelength region from, for example, 400 nm to 500 nm, that is, blue light.
- the phosphor 61 is, for example, BaMgAl 10 O 17 : Eu, or (Sr, Ca, Ba) 10 (PO 4 ) 6 Cl 2 : Eu, (Sr, Ba) 10 (PO 4 ) 6 Cl 2 : Materials such as Eu may be included.
- the phosphor 61 may convert violet light into light specified in the spectrum having a peak wavelength in the wavelength region from, for example, 450 nm to 550 nm, that is, blue-green light.
- the phosphor 61 may contain a material such as (Sr, Ba, Ca) 5 (PO 4 ) 3 Cl: Eu, Sr 4 Al 14 O 25 : Eu and the like.
- the phosphor 61 may convert the violet light into light specified in the spectrum having a peak wavelength in the wavelength region from, for example, 500 nm to 600 nm, that is, green light.
- the phosphor 61 is, for example, SrSi 2 (O, Cl) 2 N 2 : Eu, (Sr, Ba, Mg) 2 SiO 4 : Eu 2+ , or ZnS: Cu, Al, Zn 2 SiO 4 : Mn. Etc. may be included.
- the phosphor 61 may convert the violet light into light specified in the spectrum having a peak wavelength in the wavelength region from, for example, 600 nm to 700 nm, that is, red light.
- the phosphor 61 contains a material such as, for example, Y 2 O 2 S: Eu, Y 2 O 3 : Eu, SrCaClAlSiN 3 : Eu 2+ , CaAlSiN 3 : Eu, or CaAlSi (ON) 3 : Eu. good.
- the phosphor 61 may convert the violet light into light specified in the spectrum having a peak wavelength in the wavelength region from, for example, 680 nm to 800 nm, that is, near infrared light. Near-infrared light may include light in the wavelength range from 680 to 2500 nm. In this case, the phosphor 61 may contain a material such as, for example, 3Ga 5 O 12 : Cr.
- the combination of types of the phosphor 61 contained in the wavelength conversion member 6 is not particularly limited.
- the phosphor 61 is not limited to the above-mentioned materials, and may contain various other materials.
- the purple light incident on the wavelength conversion member 6 from the light emitting element 3 is converted into light having a different peak wavelength by the phosphor 61.
- the peak wavelength of the converted light may be included in the visible light region.
- the light converted by the combination of the phosphors 61 included in the wavelength conversion member 6 may have a plurality of peak wavelengths. For example, if the phosphor 61 contains a material that emits blue fluorescence, a material that emits blue-green fluorescence, and a material that emits green fluorescence, the converted light has wavelengths of blue, blue-green, and green, respectively. As a peak wavelength. If the phosphor 61 contains only one material, the converted light has the peak wavelength of that material.
- the phosphor 61 is not limited to these examples, and may contain various combinations of materials.
- the color of the light emitted from the wavelength conversion member 6 is determined based on the type of material contained in the phosphor 61. That is, the converted light can have various spectra.
- the light emitting device 10 can emit light having various spectra depending on the combination of materials contained in the phosphor 61.
- the light emitting device 10 emits, for example, a spectrum of direct sunlight from the sun, a spectrum of sunlight reaching a predetermined depth in the sea, a spectrum of light emitted by a candle flame, a spectrum of light of a firefly, or the like. can.
- the light emitting device 10 can emit light having various colors.
- the light emitting device 10 can emit light having various color temperatures.
- the reflective layer 40 covers at least a part of the first wiring 31. It is assumed that the reflectance of the excitation light emitted from the light emitting element 3 or the illumination light converted by the wavelength conversion member 6 in the reflective layer 40 is higher than the reflectance in the first wiring 31. By doing so, the excitation light or the illumination light is less likely to be absorbed when incident on the upper surface 2A, and is reflected by the upper surface 2A so that it can easily proceed toward the upper side of the light emitting device 10. As a result, the luminous efficiency of the light emitting device 10 can be improved.
- the light emitting element 3 covers the power feeding pad 33 having an electrical connection relationship.
- the term "covering” as used herein may mean, for example, a state in which 80% or more of the feeding pad 33 is covered.
- the power feeding pad 33 is covered with the light emitting element 3. Since the power feeding pad 33 is electrically connected to the light emitting element 3, it is not covered with the reflective layer 40 in principle.
- the excitation light or the illumination light incident on the feeding pad 33 is reduced.
- it becomes difficult for the feeding pad 33 to absorb the excitation light or the illumination light As a result, the luminous efficiency of the light emitting device 10 can be improved.
- the reflective layer 40 may cover all of the first wiring 31. By doing so, the excitation light or the illumination light incident on the first wiring 31 is reduced. By reducing the incident light, it becomes difficult for the light to be absorbed by the first wiring 31. As a result, the luminous efficiency of the light emitting device 10 can be further improved.
- the state of covering all of the first wiring 31 may include a state in which some parts are not covered due to an error in forming the reflective layer 40. A range in which the reflection of light from the light emitting element 3 is not affected, for example, the first wiring 31 not covered by the reflective layer 40 absorbs light, so that the decrease in luminous efficiency from the light emitting element 3 is less than 3%. Any effect that stays may be included in the error.
- the light emitting element 3 may be located on the feeding pad 33 so as to cover all of the feeding pad 33 in the plan view of the upper surface 2A of the element substrate 2. By doing so, it becomes more difficult for the excitation light or the illumination light to enter the feeding pad 33. By reducing the incident light, it becomes difficult for the light to be absorbed by the feeding pad 33. As a result, the luminous efficiency of the light emitting device 10 can be further improved.
- the state of covering all of the power feeding pad 33 may include a state in which some parts are not covered due to an error at the time of mounting the light emitting element 3.
- the error may include, for example, a state in which the power feeding pad 33 is covered by the light emitting element 3 by 95% or more.
- the feeding pad 33 not covered by the light emitting element 3 absorbs the light, so that the decrease in the luminous efficiency from the light emitting element 3 is less than 3%. If it is an effect, it may be included in the error.
- the reflective layer 40 may cover a part of the region overlapping with the light emitting element 3 in the planar perspective of the element substrate 2. Further, the reflective layer 40 may cover a part of the feeding pad 33 as long as the electrical connection between the feeding pad 33 and the light emitting element 3 is not hindered. By doing so, it becomes more difficult for the excitation light or the illumination light to enter the feeding pad 33. By reducing the incident light, it becomes difficult for the light to be absorbed by the feeding pad 33. As a result, the luminous efficiency of the light emitting device 10 can be further improved.
- the reflective layer 40 may cover all the regions of the first region 21 of the upper surface 2A of the element substrate 2 that are not covered by the light emitting element 3 in planar fluoroscopy. By doing so, the reflectance of the entire upper surface 2A of the element substrate 2 can be increased. As a result, the luminous efficiency of the light emitting device 10 can be improved.
- the reflective layer 40 may cover the entire region of the first region 21 of the upper surface 2A of the element substrate 2 except for the region where the power feeding pad 33 is located. By doing so, the reflectance of the entire upper surface 2A of the element substrate 2 can be increased. As a result, the luminous efficiency of the light emitting device 10 can be improved.
- the light emitting device 10 can improve the light emitting efficiency.
- the lighting device 100 includes at least one light emitting device 10, and emits light emitted by the light emitting device 10 as illumination light.
- the intensity of the light emitted by each light emitting device 10 may be controlled independently or may be controlled in association with each other.
- the spectra of the light emitted by each light emitting device 10 may be the same or different from each other.
- the lighting device 100 may control the spectrum of the combined light emitted by each light emitting device 10 by controlling the intensity of the light emitted by each light emitting device 10 in association with each other.
- the light obtained by synthesizing the light emitted by each light emitting device 10 is also referred to as synthetic light.
- the lighting device 100 may emit synthetic light as illumination light.
- the lighting device 100 may select at least a part of the plurality of light emitting devices 10 to emit the lighting light.
- the lighting device 100 may further include a mounting plate 110 on which the light emitting device 10 is mounted.
- the lighting device 100 may further include a housing 120 having a groove-shaped portion for accommodating the mounting plate 110, and a pair of end plates 130 for closing the short side end portion of the housing 120.
- the number of light emitting devices 10 mounted on the mounting plate 110 may be one or two or more.
- the light emitting device 10 may be mounted on the mounting plate 110 so as to be lined up in a row, or may be mounted so as to be lined up in a grid pattern or a houndstooth pattern.
- the light emitting device 10 is not limited to these patterns, and may be mounted on the mounting plate 110 in various arrangement patterns.
- the mounting plate 110 may include a circuit board having a wiring pattern.
- the circuit board may include, for example, a printed circuit board such as a rigid board, a flexible board, or a rigid flexible board.
- the circuit board may include a drive circuit that controls the light emitting device 10.
- the mounting plate 110 has a function of dissipating the heat generated by the light emitting device 10 to the outside.
- the mounting plate 110 may be made of, for example, a metal material such as aluminum, copper or stainless steel, an organic resin material, or a composite material containing these.
- the mounting plate 110 may have an elongated rectangular shape in a plan view.
- the shape of the mounting plate 110 is not limited to this, and may be various other shapes.
- the lighting device 100 may further include a mounting plate 110 housed inside the housing 120 and a lid 140 for sealing the light emitting device 10. Since the lid portion 140 is made of a translucent material, the illumination light emitted by the light emitting device 10 may be transmitted to the outside of the illumination device 100.
- the lid portion 140 may be made of, for example, a resin material such as acrylic resin or glass.
- the lid portion 140 may have an elongated rectangular shape in a plan view. The shape of the lid portion 140 is not limited to this, and may be various other shapes.
- the lighting device 100 may further include a sealing member between the lid 140 and the housing 120. By doing so, it becomes difficult for water, dust, or the like to enter the inside of the housing 120. As a result, the reliability of the lighting device 100 can be improved regardless of the environment in which the lighting device 100 is installed.
- the lighting device 100 may further include a hygroscopic agent inside the housing 120.
- the frame member 4 may be inclined so that the inner wall surface thereof spreads outward as the distance from the upper surface 2A of the element substrate 2 increases.
- the inner wall surface functions as a reflecting surface that reflects the light emitted by the light emitting element 3.
- the descriptions such as “first” and “second” are identifiers for distinguishing the configuration.
- the configurations distinguished by the descriptions such as “first” and “second” in the present disclosure can exchange numbers in the configurations.
- the first conversion light can exchange the identifiers “first” and “second” with the second conversion light.
- the exchange of identifiers takes place at the same time.
- the configuration is distinguished.
- the identifier may be deleted. Configurations with the identifier removed are distinguished by a code. Based solely on the description of identifiers such as "1st” and “2nd” in the present disclosure, it shall not be used as an interpretation of the order of the configurations or as a basis for the existence of identifiers with smaller numbers.
- the X-axis, Y-axis, and Z-axis are provided for convenience of explanation and may be interchanged with each other.
- the configuration according to the present disclosure has been described using a Cartesian coordinate system composed of X-axis, Y-axis, and Z-axis.
- the positional relationship of each configuration according to the present disclosure is not limited to being orthogonal.
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Abstract
Description
図1、図2、図3及び図4に示されるように、発光装置10は、素子基板2と、発光素子3と、波長変換部材6とを備える。発光装置10は、必須ではないが、枠部材4を更に備える。発光素子3は、素子基板2に実装されている。波長変換部材6は、発光素子3の上に位置する。発光装置10は、発光素子3が射出する光を波長変換部材6で変換した光を射出する。
また、枠部材4は、第2配線32のうち、第1部分321を全て覆っていてもよい。このようにすることで、第2配線32に入射する励起光又は照明光が減少する。入射する光が減少することによって、光が第2配線32で吸収されにくくなる。その結果、発光装置10の発光効率がより一層高められ得る。なお、このとき、第2配線32の第1部分321の全てを覆うには、枠部材4の接合時における誤差により覆われていない箇所がある状態も含まれていてもよい。発光素子3からの光の反射に影響が出ない範囲、例えば枠部材4に覆われていない第1部分321が光を吸収することにより、発光素子3からの発光効率の低下が3%未満の影響であれば、誤差に含めることができる。
図8に示されるように、一実施形態に係る照明装置100は、少なくとも1つの発光装置10を備え、発光装置10が射出する光を照明光として射出する。照明装置100は、複数の発光装置10を備える場合、各発光装置10が射出する光の強度を独立に制御してもよいし、関連づけて制御してもよい。各発光装置10が射出する光のスペクトルは、同じであってもよいし、互いに異なっていてもよい。照明装置100は、各発光装置10が射出する光の強度を関連づけて制御することによって、各発光装置10が射出する光を合成した光のスペクトルを制御してもよい。各発光装置10が射出する光を合成した光は、合成光とも称される。照明装置100は、合成光を照明光として射出してもよい。照明装置100は、複数の発光装置10の少なくとも一部を選択して照明光を射出させてもよい。
2 素子基板(2A:上面、21:第1領域、22:第2領域)
3 発光素子
4 枠部材
6 波長変換部材(60:透光部材、61:蛍光体)
31 第1配線
32 第2配線(321:第1部分、322:第2部分)
33 給電パッド
34 半田材
35 第3配線
40 反射層
100 照明装置(110:実装板、120:筐体、130:端板、140:蓋部)
Claims (13)
- 互いに電気的に接続された給電配線及び給電パッドを有する基板と、
前記給電配線の少なくとも一部を覆うよう前記給電配線上に位置する反射層と、
前記給電パッドを介して前記給電配線に電気的に接続され、励起光を射出する発光素子と、
前記発光素子の上に位置し、前記励起光を照明光に変換する波長変換部材と
を備え、
前記発光素子は、前記基板の平面透視において、電気的な接続関係にある前記給電パッドを覆うように前記給電パッドの上に位置する、
発光装置。 - 前記発光素子は、前記基板の平面透視において、前記給電パッドの全てを覆って前記給電パッド上に位置している、請求項1に記載の発光装置。
- 前記反射層は、前記基板の平面透視において、前記発光素子と重なる領域の一部を覆う、請求項1又は2に記載の発光装置。
- 前記基板は、前記給電パッドが位置する第1領域と、前記第1領域の周囲に位置する第2領域とを有し、
前記給電配線は、前記第1領域に位置するとともに前記給電パッドに電気的に接続される第1配線を含む、請求項1から3までのいずれか一項に記載の発光装置。 - 前記反射層は、前記第1配線の全てを覆う、請求項4に記載の発光装置。
- 前記反射層は、少なくとも前記第1領域のうち前記給電パッドを除く全ての領域を覆う、請求項4又は5に記載の発光装置。
- 前記給電配線は、前記第2領域に位置する第2配線を更に含み、
前記反射層は、前記第2配線の少なくとも一部を覆う、請求項4から6までのいずれか一項に記載の発光装置。 - 前記基板の前記第2領域の上に位置し、前記波長変換部材を囲むとともに、前記波長変換部材と接した枠部材を更に備える、請求項4から7までのいずれか一項に記載の発光装置。
- 前記枠部材の上面は、曲面を含む、請求項8に記載の発光装置。
- 前記枠部材と前記反射層とは、同じ材料を含んで構成され、
前記枠部材の粘性は、前記反射層の粘性よりも高い、請求項8又は9に記載の発光装置。 - 前記給電配線は、前記第2領域に位置する第2配線を更に含み、
前記第2配線は、前記第1領域を囲んで位置する第1部分と、前記第1部分から外部の電源に延びた第2部分と、を含み、
前記枠部材は、前記第1部分の全てを覆う、請求項8から10までのいずれか一項に記載の発光装置。 - 前記発光素子は、前記基板に対してフリップチップ接合で実装される、請求項1から11までのいずれか一項に記載の発光装置。
- 少なくとも1つの請求項1から12までのいずれか一項に記載の発光装置を備える、照明装置。
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JP2013095782A (ja) * | 2011-10-28 | 2013-05-20 | Mitsubishi Chemicals Corp | 半導体発光装置用シリコーン樹脂組成物 |
JP2013153069A (ja) | 2012-01-25 | 2013-08-08 | Shinko Electric Ind Co Ltd | 配線基板、発光装置及び配線基板の製造方法 |
WO2016067794A1 (ja) * | 2014-10-28 | 2016-05-06 | シャープ株式会社 | 基板及び発光装置 |
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JP2021022605A (ja) * | 2019-07-25 | 2021-02-18 | 日亜化学工業株式会社 | 発光装置の製造方法及び発光装置、並びに、素子載置用配線基板及び素子載置用配線基板の製造方法 |
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