WO2022114086A1 - 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
- WO2022114086A1 WO2022114086A1 PCT/JP2021/043284 JP2021043284W WO2022114086A1 WO 2022114086 A1 WO2022114086 A1 WO 2022114086A1 JP 2021043284 W JP2021043284 W JP 2021043284W WO 2022114086 A1 WO2022114086 A1 WO 2022114086A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light emitting
- light
- emitting device
- recess
- wavelength conversion
- Prior art date
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Images
Classifications
-
- 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
-
- 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
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
-
- 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
-
- 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
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
-
- 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
Definitions
- This disclosure relates to a light emitting device and a lighting device.
- a light emitting device in which a light emitting element located in an inner space surrounded by a frame is sealed by filling the inside of the frame with a resin (see, for example, Patent Document 1).
- the light emitting device includes a substrate having a first surface, a light emitting element, and a wavelength conversion member 6.
- the light emitting element is mounted on the first surface and emits excitation light.
- the wavelength conversion member is located above at least a part of the first surface and the light emitting element, and converts the excitation light into illumination light.
- the substrate has a recess having a second surface located below the first surface, a third surface connecting between the second surface and the first surface, and above the first surface. It has at least one of the protruding protrusions.
- the wavelength conversion member contacts at least one of the second surface and at least a part of the convex portion.
- the lighting device includes the light emitting device and a mounting plate on which the light emitting device is mounted.
- FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is an enlarged view of the part surrounded by the broken line of FIG.
- sectional drawing which shows the structural example which the 2nd surface of a recess has a reverse taper shape.
- sectional drawing which shows the structural example which the lower part of a concave part has a cavity shape.
- sectional drawing which shows the angle between the 2nd surface and the 3rd surface which make up a concave part.
- the light emitting device 10 includes an element substrate 2, a light emitting element 3, and a wavelength conversion member 6.
- the element substrate 2 has a first surface 21, a concave portion 22, and a convex portion 26.
- the light emitting element 3 is mounted on the first surface 21 of the element substrate 2.
- the wavelength conversion member 6 is located on the light emitting element 3 and on the first surface 21 of the element substrate 2, and covers the upper surface and the side surface of the light emitting element 3.
- the wavelength conversion member 6 converts the light emitted by the light emitting element 3 into light having a different wavelength.
- the light emitting device 10 emits the light converted by the wavelength conversion member 6.
- the upper part of the light emitting device 10 corresponds to the positive direction of the Z axis.
- 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) orglasse, 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 a first surface 21 that faces the positive direction of the Z axis.
- the light emitting element 3 is mounted on the first surface 21 of the element substrate 2.
- the element substrate 2 includes a first wiring 31 and a second wiring 32 for supplying power to the light emitting element 3.
- the first wiring 31 extends in a direction intersecting the first surface 21 and is exposed in a plan view of the first surface 21.
- the first wiring 31 may be flush with respect to the first surface 21, or may project upward from the first surface 21.
- the first wiring 31 is also referred to as a via wiring.
- the second wiring 32 extends in a direction along the first surface 21.
- the first wiring 31 may extend to a surface (also referred to as a back surface) of the element substrate 2 facing the negative direction of the Z axis.
- the second wiring 32 may be located on the back surface of the element substrate 2. Further, the second wiring 32 may be located both on the back surface of the element substrate 2 and inside the element substrate 2.
- the first wiring 31 and the second wiring 32 may be formed 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 may be formed by firing.
- the first wiring 31 and the second wiring 32 may include a plating layer such as nickel or gold formed on the surface thereof for oxidation prevention.
- the first wiring 31 and the second wiring 32 are also referred to as power feeding wiring.
- the element substrate 2 further includes a reflective film 40 located on the first surface 21.
- the reflective film 40 is located on the first surface 21 so as to cover at least a part of the first surface 21.
- the reflective film 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 film 40 is not limited to this example, and may be formed so that the reflectance of the reflective film 40 is higher than the reflectance of the first surface 21.
- the first surface 21 of the element substrate 2 has a recess 22.
- the recess 22 is configured as a space partitioned by a second surface 23 and a third surface 24.
- the recess 22 has an opening at the same height as the first surface 21, and is connected to the space above through the opening.
- the recess 22 may be configured to include at least one hole.
- the second surface 23 extends in a direction along the first surface 21 and is located in a direction in which the element substrate 2 enters the inside of the element substrate 2 rather than the first surface 21. That is, the second surface 23 is located below the first surface 21.
- the third surface 24 connects between the first surface 21 and the second surface 23, and extends in a direction intersecting the first surface 21 and the second surface 23.
- the recess 22 may have a plurality of third surfaces 24 when it has a rectangular shape or the like in a plan view. Further, in the case of a circular shape in a plan view, the third surface 24 may be a cylindrical shape.
- the recess 22 may be covered with the reflective film 40 on at least a part of the third surface 24 facing the light emitting element 3.
- the reflective film 40 may cover the third surface 24 to the extent that it connects to a part of the second surface 23 of the recess 22.
- the wavelength conversion member 6 enters at least a part of the recess 22. Further, the wavelength conversion member 6 comes into contact with at least a part of the second surface 23. When the wavelength conversion member 6 enters the recess 22 and comes into contact with at least a part of the second surface 23, the contact area between the element substrate 2 and the wavelength conversion member 6 can be increased. As a result, the adhesion of the wavelength conversion member 6 to the element substrate 2 can be improved. That is, the wavelength conversion member 6 is less likely to be peeled off from the element substrate 2. Further, when the wavelength conversion member 6 comes into contact with at least a part of the third surface 24 of the recess 22, the wavelength conversion member 6 can come into contact with the element substrate 2 in at least two directions. As a result, even if the wavelength conversion member 6 receives an external force, it is difficult to peel off from the element substrate 2.
- the wavelength conversion member 6 comes into direct contact with at least a part of the second surface 23. In other words, the wavelength conversion member 6 contacts at least a part of the second surface 23 without passing through the reflective film 40.
- the heat generated when the excitation light is converted into the illumination light in the wavelength conversion member 6 is transmitted to the element substrate 2 and directed toward the back surface of the element substrate 2 (the surface on the negative direction side of the Z axis). Be dissipated.
- the thickness of the element substrate 2 on the first surface 21 is represented by T1.
- the thickness is the size of the element substrate 2 in the Z-axis direction.
- the thickness of the element substrate 2 on the second surface 23 is represented by T2. Since T2 is thinner than T1, the second surface 23 is closer to the back surface than the first surface 21.
- the thermal resistance from the second surface 23 to the back surface is smaller than the thermal resistance from the first surface 21 to the back surface.
- the amount of heat dissipated from the wavelength conversion member 6 that has entered the second surface 23 to the back surface through the second surface 23 passes through the first surface 21 from the wavelength conversion member 6 located on the first surface 21. It can be larger than the amount of heat dissipated to the back surface. That is, when the wavelength conversion member 6 comes into contact with the second surface 23, heat is easily dissipated from the wavelength conversion member 6.
- the thermal conductivity of the reflective film 40 is lower than the thermal conductivity of the element substrate 2 and the wavelength conversion member 6.
- the amount of heat dissipated from the wavelength conversion member 6 to the element substrate 2 is larger when it is directly transmitted to the element substrate 2 without passing through the reflective film 40 than when it is transmitted to the element substrate 2 through the reflective film 40. .. Therefore, by connecting the wavelength conversion member 6 to at least a part of the second surface 23 without passing through the reflective film 40, heat is easily dissipated from the wavelength conversion member 6.
- the element substrate 2 may be configured so that the depth of the recess 22 is smaller than the thickness of the element substrate 2 on the second surface 23.
- the element substrate 2 may be configured so that the distance from the first surface 21 to the second surface 23 is smaller than the thickness of the element substrate 2 on the second surface 23.
- the first surface 21 of the element substrate 2 has a convex portion 26 protruding upward from the first surface 21.
- the convex portion 26 has a fourth surface 27 and a fifth surface 28.
- the fourth surface 27 extends in a direction along the first surface 21 and is located in a direction away from the element substrate 2 than the first surface 21.
- the fifth surface 28 extends in a direction intersecting the first surface 21 and the fourth surface 27 so as to connect the first surface 21 and the fourth surface 27.
- the top (upper surface) of the convex portion 26 does not have to be flat.
- the convex portion 26 may be configured such that the top portion (upper surface) thereof is a curved surface. Further, the portion of the top of the convex portion 26 near the light emitting element 3 may have an inclined surface. In such a case, the efficiency of upward light radiation can be improved.
- the wavelength conversion member 6 comes into contact with at least a part of the convex portion 26.
- the contact area between the element substrate 2 and the wavelength conversion member 6 can be increased.
- the adhesion of the wavelength conversion member 6 to the element substrate 2 can be improved. That is, the wavelength conversion member 6 is less likely to be peeled off from the element substrate 2.
- the wavelength conversion member 6 comes into contact with at least a part of the fifth surface 28 of the convex portion 26.
- the wavelength conversion member 6 can come into contact with the element substrate 2 in at least two directions. As a result, even if the wavelength conversion member 6 receives an external force, it is difficult to peel off from the element substrate 2.
- the convex portion 26 may be covered with the reflective film 40 at least a part of the fifth surface 28 located on the side close to the light emitting element 3.
- the reflective film 40 covers at least a part of the fifth surface 28 located on the side of the convex portion 26 near the light emitting element 3, so that the excitation light or the illumination light that has entered the convex portion 26 is directed upward of the element substrate 2. It is reflected and is less likely to be absorbed by the convex portion 26. Further, the excitation light emitted from the side surface of the light emitting element 3 and the illumination light converted from the excitation light due to the reflection of the excitation light or the illumination light on the fifth surface 28 of the convex portion 26 do not have the convex portion 26. It is easier to move upward than in the case. As a result, the upward luminous efficiency can be improved.
- the depth of the recess 22 from the first surface 21, that is, the distance from the first surface 21 to the second surface 22 is represented by H1.
- the height of the convex portion 26 from the first surface 21, that is, the distance from the first surface 21 to the top of the convex portion 26 is represented by H2. It is assumed that H2 is smaller than H1. By doing so, the light traveling from the light emitting element 3 along the first surface 21 of the element substrate 2 is less likely to enter the convex portion 26. That is, it is possible to reduce the emission of the excitation light or the illumination light from the side of the light emitting device 10. As a result, the luminous efficiency at a wide angle can be improved.
- the convex portion 26 may be located on the side farther from the concave portion 22 when viewed from the light emitting element 3. When a plurality of the concave portion 22 and the convex portion 26 are respectively located, the convex portion 26 is located on the side farther from the concave portion 22 when viewed from the light emitting element 3 in the relationship between the closest concave portion 22 and the convex portion 26. You may be doing it. Further, a plurality of concave portions 22 and a plurality of convex portions 26 may be arranged concentrically from the light emitting element 3. By doing so, the convex portion 26 is located far from the light emitting element 3, so that it becomes difficult to absorb the excitation light or the illumination light. As a result, the luminous efficiency can be improved.
- 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 first surface 21 of the element substrate 2.
- the light emitting element 3 is electrically connected to the first surface 21 of the element substrate 2 and to the first wiring 31 via, for example, a brazing material or solder.
- the first wiring 31 is installed as a set of two so as to be connected to the positive and negative electrodes of the light emitting element 3.
- the light emitting element 3 is located on the first wiring 31 so as to cover at least a part of the first wiring 31 in the plan perspective of the first surface 21 of the element substrate 2.
- the light emitting element 3 may be larger than the first wiring 31 in plan perspective.
- the light emitting element 3 may be mounted on the element substrate 2 by flip-chip bonding.
- the first wiring 31 and the brazing material, solder, or the like are located so as to be covered with the light emitting element 3 in the plan view of the first surface 21.
- the excitation light emitted from the light emitting element 3 or the illumination light converted by the wavelength conversion member 6 is the first wiring 31 and the brazing material. Or, it becomes difficult to be incident on solder or the like. As a result, the excitation light or the illumination light is less likely to be absorbed by the first wiring 31, the brazing material, the solder, or the like. 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 first surface 21 of the element substrate 2 is one in FIG. 1 and the like, but is not particularly limited, and may be two or more. 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 first surface 21.
- 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 wavelength conversion member 6 is located on the first surface 21 of the element substrate 2.
- the wavelength conversion member 6 seals the light emitting element 3 by filling the space above the light emitting element 3.
- the wavelength conversion member 6 may be formed by being applied in a paste state on the first surface 21 of the element substrate 2 and then cured.
- the wavelength conversion member 6 may be formed by being attached to the first surface 21 of the element substrate 2 in the form of a sheet and then cured.
- the excitation light emitted from the light emitting element 3 is directly incident 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 the 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 range from, for example, 500 nm to 600 nm, i.e. 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 the respective wavelengths of blue, blue-green, and green. 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 element substrate 2 has at least one of the concave portion 22 and the convex portion 26 located on the first surface 21. Further, the wavelength conversion member 6 contacts at least one of at least a part of the second surface 23 and at least a part of the convex portion 26. By doing so, the wavelength conversion member 6 is less likely to be peeled off from the element substrate 2. Further, the wavelength conversion member 6 has a simple structure that is only located on the element substrate 2, and is less likely to be peeled off from the element substrate 2. As a result, the light emitting device 10 according to the present embodiment can maintain or improve reliability while simplifying the configuration.
- the wavelength conversion member 6 is more difficult to peel off. Further, by locating at least one of the concave portion 22 and the convex portion 26 on the first surface 21, the luminous efficiency of the light emitting device 10 can be improved.
- the recess 22 may be configured such that the area of the opening is smaller than the area of the second surface 23.
- the recess 22 may be configured such that the length of the opening (L1) in the cross-sectional view is shorter than the length (L2) of the second surface 23 in the cross-sectional view.
- the recess 22 may be configured so that the end portion of the opening of the recess 22 is located inside the end portion of the second surface 23 of the recess 22 in the plan view of the element substrate 2.
- the recess 22 may be configured such that the angle ( ⁇ 1) between the second surface 23 and the third surface 24 that partitions the recess 22 is an acute angle.
- the shape exemplified in FIG. 4 is also referred to as a reverse taper shape.
- the recess 22 may be configured in at least two stages in a cross-sectional view.
- the recess 22 is configured such that the area of the element substrate 2 in a plan view is smaller in the lower stage (the stage farther from the first surface 21) than in the upper stage (the stage closer to the first surface 21). It's okay.
- the shape exemplified in FIG. 5 is also referred to as a cavity shape.
- the wavelength conversion member 6 is less likely to be peeled off from the first surface 21 of the element substrate 2. That is, the adhesion of the wavelength conversion member 6 to the element substrate 2 can be improved.
- the recess 22 may be configured so that the cross-sectional area of the space of the recess 22 is smaller than that of the second surface 23 in at least a part in the height direction between the first surface 21 and the second surface 23. That is, the space of the recess 22 may have a constricted shape in a cross-sectional view. Even with this configuration, the wavelength conversion member 6 is less likely to be peeled off from the first surface 21 of the element substrate 2.
- the recess 22 has an angle ( ⁇ 2) between the third surface 24 and the second surface 23 located on the side far from the light emitting element 3 (the side in the positive direction of the Y axis in FIG. 6). It may be configured to have an obtuse angle.
- the third surface 24 on the side farther from the light emitting element 3 is the third surface 24 connected to the light emitting element 3 among the plurality of third surfaces 24 in the cross-sectional view when the concave portion 22 is rectangular in the plan view. It is the third surface 24 at the position facing the above. Further, when the concave portion 22 has a circular shape in a plan view, it is a region of the third surface 24 at a position facing the region connected to the light emitting element 3.
- the incident light is reflected by the third surface 24. Since the angle ( ⁇ 2) between the third surface 24 and the second surface 23 on the side far from the light emitting element 3 is an obtuse angle, the light incident from the light emitting element 3 is likely to be reflected upward. As a result, the amount of light emitted outward from the light emitting device 10 may increase. That is, the luminous efficiency of the light emitting device 10 can be improved.
- the recess 22 may be formed in a groove shape surrounding the light emitting element 3 in the plan view of the element substrate 2.
- the recess 22 may be interrupted in the middle without going around the light emitting element 3.
- the recess 22 may be formed in a groove shape extending in one direction such as the X-axis direction or the Y-axis direction. Since the recess 22 is formed in a groove shape, the area where the wavelength conversion member 6 enters the recess 22 is increased. As a result, the adhesion of the wavelength conversion member 6 to the element substrate 2 can be improved.
- the element substrate 2 may have at least the first layer 201 and the second layer 202.
- the number of layers is not limited to two, and may be three or more. In other words, the element substrate 2 may include at least two layers. It is assumed that the boundary between the first layer 201 and the second layer 202 is exposed in the space of the recess 22. The boundary between the first layer 201 and the second layer 202 may have a minute gap.
- the translucent member 60 that has entered the recess 22 may further have an intrusion portion 601 that has entered the gap between the boundary between the first layer 201 and the second layer 202. In other words, at least a part of the wavelength conversion member 6 may enter between adjacent layers of the element substrate 2.
- the translucent member 60 has the intrusion portion 601
- the wavelength conversion member 6 including the translucent member 60 is less likely to be peeled off from the element substrate 2 having the recess 22. That is, the adhesion of the wavelength conversion member 6 to the element substrate 2 can be improved.
- the light emitting device 10 is configured to emit illumination light toward the upper side (positive direction of the Z axis) of the wavelength conversion member 6 located on the first surface 21 of the element substrate 2.
- the light emitting device 10 may be configured to emit illumination light toward the side (X-axis direction or Y-axis direction) of the wavelength conversion member 6. By doing so, the luminous efficiency can be improved.
- the light emitting device 10 may be formed by forming two or more light emitting devices 10 on the element substrate 2 and then separating them one by one by dicing the element substrate 2. Further, the light emitting device 10 may be formed by mounting a plurality of light emitting elements 3 on the element substrate 2, attaching or applying the wavelength conversion member 6, and then separating them one by one. The element substrate 2 may be separated so that one light emitting device 10 includes one light emitting element 3, or may be separated so as to include two or more light emitting elements 3.
- the first surface 21 of the element substrate 2 may further have a second recess 29.
- the second recess 29 is located below the light emitting element 3.
- the second recess 29 is positioned so as to overlap the light emitting element 3 in the plan view of the first surface 21.
- the depth of the second recess 29 may be shallower as shown in FIG. 9 or as shown in FIG. 10 as compared with the depth of the recess 22 located so as not to overlap the light emitting element 3. They may be the same or deeper as shown in FIG.
- the presence of the second recess 29 allows the wavelength conversion member 6 to enter the second recess 29 at the bottom of the light emitting element 3.
- the wavelength conversion member 6 serves as a bonding material when the light emitting element 3 and the element substrate 2 are bonded, and the bonding strength between the light emitting element 3 and the element substrate 2 is improved. If the depth of the second recess 29 is the same as the depth of the recess 22, when heat is applied to the wavelength conversion member 6 or the like, the stress load applied to each recess is not biased and the element substrate 2 is cracked. Etc. can be made less likely to occur. Further, when the depth of the second recess 29 is deeper than the depth of the recess 22, the amount of the bonding material at the position overlapping with the light emitting element 3 increases, and the bonding strength can be improved.
- the bonding strength is improved and the possibility of the substrate being deformed is reduced as compared with the case where the depth is deep.
- the bonding strength can be improved, and the light emitting element 3 can be stably mounted.
- 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 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 surface 21 can exchange the second surface 23 with the identifiers "first” and “second”.
- 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, the Y-axis, and the 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.
- Light emitting device 2 element substrate (21: 1st surface, 22: concave surface, 23: 2nd surface, 24: 3rd surface, 26: convex portion, 27: 4th surface, 28: 5th surface, 29: 2nd surface Recess, 201: 1st layer, 202: 2nd layer) 3 Light emitting element 6 Wavelength conversion member (60: translucent member, 61: phosphor, 601: intrusion part) 31 1st wiring 32 2nd wiring 40 Reflective layer 100 Lighting device (110: mounting plate, 120: housing, 130: end plate, 140: lid)
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Abstract
Description
図1、図2、及び図3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。素子基板2は、第1面21と、凹部22と、凸部26とを有する。発光素子3は、素子基板2の第1面21の上に実装されている。波長変換部材6は、発光素子3の上及び素子基板2の第1面21の上に位置し、発光素子3の上面及び側面を覆っている。波長変換部材6は、発光素子3が射出する光を異なる波長の光に変換する。発光装置10は、波長変換部材6で変換された光を射出する。図1等において、発光装置10の上方は、Z軸の正の方向に対応する。
凹部22は、開口の面積が第2面23の面積よりも小さくなるように構成されてよい。例えば、図4に示されるように、凹部22は、断面視における開口の長さ(L1)が断面視における第2面23の長さ(L2)よりも短くなるように構成されてよい。また、凹部22は、素子基板2の平面視において、凹部22の開口の端部が凹部22の第2面23の端部よりも内側に位置するように構成されてよい。また、凹部22は、凹部22を区画する第2面23と第3面24との角度(θ1)が鋭角となるように構成されてよい。図4に例示される形状は、逆テーパ形状とも称される。
図12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(21:第1面、22:凹部、23:第2面、24:第3面、26:凸部、27:第4面、28:第5面、29:第2凹部、201:第1層、202:第2層)
3 発光素子
6 波長変換部材(60:透光部材、61:蛍光体、601:侵入部)
31 第1配線
32 第2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 (14)
- 第1面を有する基板と、
前記第1面の上に実装されており、励起光を射出する発光素子と、
前記第1面の少なくとも一部と前記発光素子との上に位置し、前記励起光を照明光に変換する波長変換部材と
を備え、
前記基板は、前記第1面より下に位置する第2面と、前記第2面と前記第1面との間を接続する第3面とを有する凹部、及び、前記第1面から上に突出する凸部のうち少なくとも一方を有し、
前記波長変換部材は、前記第2面の少なくとも一部、及び、前記凸部の少なくとも一部のうち少なくとも一方に接触する、
発光装置。 - 前記第1面の少なくとも一部を覆う反射膜を更に備え、
前記波長変換部材は、前記基板が前記凹部を有する場合、前記第2面の少なくとも一部に前記反射膜を介さずに接触する、請求項1に記載の発光装置。 - 前記反射膜は、前記第3面の少なくとも一部を覆う、請求項2に記載の発光装置。
- 前記凸部の前記第1面からの高さは、前記凹部の前記第1面からの深さよりも小さい、請求項1から3までのいずれか一項に記載の発光装置。
- 前記凹部の前記第1面からの深さは、前記第2面における前記基板の厚みよりも小さい、請求項1から4までのいずれか一項に記載の発光装置。
- 前記凹部は、前記発光素子を囲む溝状に形成されている、請求項1から5までのいずれか一項に記載の発光装置。
- 前記凹部は、少なくとも1つの穴部を含む、請求項1から6までのいずれか一項に記載の発光装置。
- 前記第2面の面積は、前記凹部の開口の面積よりも広い、請求項1から7までのいずれか一項に記載の発光装置。
- 前記第2面と前記第3面との角度は、鋭角である、請求項8に記載の発光装置。
- 前記凹部の前記発光素子から遠い側の前記第3面と前記第2面との角度は、鈍角である、請求項1から7までのいずれか一項に記載の発光装置。
- 前記基板は、少なくとも2つの層を含み、
前記波長変換部材の少なくとも一部は、前記基板の隣り合う層の間に入り込んでいる、請求項1から10までのいずれか一項に記載の発光装置。 - 前記基板は、前記凹部及び前記凸部を有している、請求項1から11までのいずれか一項に記載の発光装置。
- 前記凸部は、前記発光素子から見て前記凹部よりも遠い側に位置している、請求項12に記載の発光装置。
- 請求項1から13までのいずれか一項に記載の発光装置と、前記発光装置が実装された実装板とを備える、照明装置。
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JP7483936B2 (ja) | 2024-05-15 |
JPWO2022114086A1 (ja) | 2022-06-02 |
EP4254524A1 (en) | 2023-10-04 |
US20240011621A1 (en) | 2024-01-11 |
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