WO2013047087A1 - 発光素子実装用基板および発光装置 - Google Patents
発光素子実装用基板および発光装置 Download PDFInfo
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- WO2013047087A1 WO2013047087A1 PCT/JP2012/072197 JP2012072197W WO2013047087A1 WO 2013047087 A1 WO2013047087 A1 WO 2013047087A1 JP 2012072197 W JP2012072197 W JP 2012072197W WO 2013047087 A1 WO2013047087 A1 WO 2013047087A1
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- WIPO (PCT)
- Prior art keywords
- emitting element
- light
- light emitting
- mounting substrate
- element mounting
- Prior art date
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- 239000000758 substrate Substances 0.000 title claims abstract description 82
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000013078 crystal Substances 0.000 claims abstract description 43
- 239000002245 particle Substances 0.000 claims abstract description 27
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052723 transition metal Inorganic materials 0.000 claims description 6
- 150000003624 transition metals Chemical class 0.000 claims description 6
- 239000000470 constituent Substances 0.000 claims description 4
- 230000006378 damage Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 description 21
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- 239000000395 magnesium oxide Substances 0.000 description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 8
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- 239000007858 starting material Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
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- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 150000002367 halogens Chemical class 0.000 description 1
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- 229910052749 magnesium Inorganic materials 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
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- 238000004080 punching Methods 0.000 description 1
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/8319—Arrangement of the layer connectors prior to mounting
- H01L2224/83192—Arrangement of the layer connectors prior to mounting wherein the layer connectors are disposed only on another item or body to be connected to the semiconductor or solid-state body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
-
- 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
-
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
Definitions
- the present invention relates to a light emitting element mounting substrate and a light emitting device in which the light emitting element is mounted on the light emitting element mounting substrate.
- LEDs light emitting diodes
- LEDs have attracted attention as light emitting elements with high brightness and low power consumption.
- LEDs is also widely used as a backlight for light sources for electric display boards, mobile phones, personal computers, etc. from general illumination.
- Patent Document 1 proposes a highly reflective white ceramic made of aluminum oxide and a vitreous component.
- a substrate made of an alumina sintered body as in Patent Document 1 is required to have a high volume resistivity because a conductor is formed on the surface, but the volume resistivity is high.
- the substrate was easily charged with static electricity due to contact with or friction with equipment or the like in the process of conductor formation or conveyance.
- the light emitting element is mounted in a state where static electricity is charged on the substrate, there is a possibility that the light emitting element may be electrostatically broken due to discharge of the charged static electricity.
- the present invention has been devised to solve the above problems, and has a low volume resistivity and a low risk of electrostatic breakdown, and a light emitting element mounted on the light emitting element mounting substrate.
- An object of the present invention is to provide a light emitting device.
- the substrate for mounting a light-emitting element of the present invention is composed of an alumina sintered body in which aluminum oxide accounts for 80% by mass or more when all constituent components are 100% by mass, and O and Al in aluminum oxide crystal particles
- the O / Al ratio which is the ratio of the atomic weight, is less than 1.5.
- the light-emitting device of the present invention is characterized in that the light-emitting element is mounted on the light-emitting element mounting substrate having the above-described configuration.
- the O / Al ratio which is the atomic weight ratio of O to Al in the aluminum oxide crystal particles, is less than 1.5, the volume resistivity can be lowered, and the conductor In the process of forming and transporting, it is possible to reduce the possibility of static electricity being charged by contact or friction with equipment or the like.
- the light emitting device of the present invention since the light emitting element is mounted on the light emitting element mounting substrate having a low volume resistivity and a low possibility of electrostatic breakdown, the light emitting device has high reliability. be able to.
- FIG. 1 is a partial cross-sectional view showing an example of formation of a conductor in the light emitting element mounting substrate of the present embodiment.
- electrodes 3a and 3b are formed on one surface 1a of the substrate 1, and a part of the electrodes 3a and 3b is formed.
- An example in which electrode pads 3c and 3d are formed is shown, and a light emitting element (not shown) made of a semiconductor is placed on the electrode pad 3c or the electrode pad 3d.
- FIG. 1 shows an example in which the electrodes 3a and 3b are formed in the through hole and on the other surface 1b.
- the light emitting element mounting substrate 1 of the present embodiment is made of an alumina sintered body in which aluminum oxide accounts for 80% by mass or more when the constituent component is 100% by mass.
- the O / Al ratio which is the atomic weight ratio of O and Al, is less than 1.5.
- the O / Al ratio which is the ratio of the atomic weight of O and Al in the aluminum oxide crystal particles, is described as the O / Al ratio in the aluminum oxide crystal particles, or simply the O / Al ratio.
- the aluminum oxide sintered body contains, for example, at least one of silicon oxide, magnesium oxide and calcium oxide in addition to aluminum oxide occupying 80% by mass or more, and is fired using these as a sintering aid. It consists of
- the aluminum oxide has a stoichiometric composition and the O / Al ratio is 1.5, as represented by the chemical formula Al 2 O 3 .
- the volume resistivity of the substrate 1 can be lowered because the O / Al ratio is less than 1.5, contact with equipment or the like in the process of conductor formation or transportation, etc. The possibility that static electricity is charged on the substrate 1 due to friction can be reduced.
- the volume resistivity can be lowered because the sintering aid component and content are the same, and the alumina sintered body having the balance made of aluminum oxide has a O / Al ratio of less than 1.5.
- the volume resistivity of the body shows a value lower than the volume resistivity (for example, 10 14 ⁇ ⁇ cm) of the sintered body having an O / Al ratio of 1.5.
- the reason why the volume resistivity can be lowered is considered to be the influence of O (oxygen) released from Al 2 O 3 and the influence of excess Al (aluminum), but the details are not clear. .
- the O / Al ratio in the aluminum oxide crystal particles is preferably 0.7 or more and 1.3 or less.
- the O / Al ratio is 0.7 or more and 1.3 or less, the light-emitting element mounting substrate 1 having high reflectance in addition to low volume resistivity can be obtained.
- the O / Al ratio in the aluminum oxide crystal particles is calculated by the following method.
- the cross section of the substrate 1 is mirror-finished and then processed using an ion milling device (MODEL691 manufactured by GATAN), and then transmitted using a transmission electron microscope (TEM, for example, JEM-2010F manufactured by JEOL Ltd.) 40,000. Observation is performed at a magnification of 2 to 60,000 times, and arbitrary 10 crystal grains of aluminum oxide are selected.
- TEM transmission electron microscope
- the spot diameter is 1 nm ⁇
- the measurement time is 50 seconds
- the measurement energy width is 0.14 to 20.48 keV
- the semi-quantitative calculation method is the thin film approximation method.
- the atomic weights of O and Al are measured, and the O / Al ratio in each aluminum oxide crystal particle is calculated from the obtained atomic weight, and the average value thereof is defined as the O / Al ratio in the aluminum oxide crystal particle.
- the O / Al ratio in the aluminum oxide crystal particles of the light-emitting element mounting substrate 1 of the present embodiment is 0.7 or more and 1.3 or less, the peak of the 104 plane of ⁇ -aluminum oxide in X-ray diffraction (CuK ⁇ ray) is obtained.
- the O / Al ratio in the crystal particles is less than 1.5
- the peak of the 104 plane moves to the wide-angle side (incident angle is large), so it can be confirmed by a numerical value of 2 ⁇ .
- the O / Al ratio is 0.7 or more and 1.3 or less
- the value of 2 ⁇ appears in the range of 35.20 ° or more and 35.35 ° or less.
- the volume resistivity is preferably 10 9 to 10 12 ⁇ ⁇ cm.
- FIG. 2 is a conceptual diagram showing a scattering state of diffuse reflected light in the light emitting element mounting substrate 1 of the present embodiment.
- This conceptual diagram shows a cross section perpendicular to the surface 1a.
- crystal grains of aluminum oxide are obtained.
- 5 and 6 and a grain boundary phase 7 mainly composed of a sintering aid component.
- the grain boundary phase 7 is at least one of silicon oxide, magnesium oxide, and calcium oxide, the grain boundary phase 7 exists as an amorphous glass phase.
- the incident light 11 irradiated from the surface 1a side of the light emitting element mounting substrate 1 of the present embodiment is a regular reflection light 13a reflected from the surface 1a in a specific direction and a diffusion reflected from the surface 1a in an unspecified direction.
- the reflected light 13b becomes the remaining light, and the remaining light becomes the light 11a traveling (transmitting) inside the substrate 1.
- the light 11a traveling inside the substrate 1 becomes regular reflection light 13c and diffuse reflection light 13d at the interface 5a of the aluminum oxide crystal particles 5 which is the boundary with the grain boundary phase 7, and the rest is further from the substrate 1.
- the light 11a travels inside.
- the light 11a traveling inside the substrate 1 becomes regular reflection light 13e and diffuse reflection light 13f at the interface 6a of the crystal particle 6 of aluminum oxide, which is the boundary with the grain boundary phase 7, and the rest further is the substrate 1 It becomes the light 11a which travels inside.
- the specularly reflected light 13a, 13c, 13e and the diffusely reflected light 13b, 13d, 13f go out of the substrate 1 as long as there are no colliding crystal particles, and if there are colliding crystal particles, they are regularly reflected at the interface. It comes out of the substrate 1 by repeating diffuse reflection or transmitting crystal particles.
- the average crystal grain size of aluminum oxide crystal grains is 0.7 ⁇ m or more and 2.0 ⁇ m or less.
- the average crystal grain size of the aluminum oxide crystal grains is 0.7 ⁇ m or more and 2.0 ⁇ m or less, the light-emitting element mounting substrate 1 having a low volume specific resistivity and a high reflectance can be obtained. This is because the number of grain boundary phases 7 made of an amorphous glass phase having a high volume resistivity can be increased without increasing the number of interfaces that reflect light.
- the cross section of the substrate 1 is mirror-finished and fire etched at a temperature lower by 50 to 100 ° C. than the maximum temperature in the firing process of the substrate 1. Then, using a scanning electron microscope (SEM, for example, JSM-7001F manufactured by JEOL Ltd.), the image was captured at a magnification of 1000 to 3000 times, and an image captured using an image analysis apparatus (for example, Win ROOF manufactured by Mitani Corporation) By analyzing, the area of each crystal particle of aluminum oxide is obtained, and the diameter (equivalent circle diameter) when a circle having an area equal to this area is calculated to calculate the average equivalent circle diameter.
- SEM scanning electron microscope
- JSM-7001F manufactured by JEOL Ltd.
- an image analysis apparatus for example, Win ROOF manufactured by Mitani Corporation
- the light reflectance of the light emitting element mounting substrate 1 of the present embodiment is measured using a spectrophotometer (eg, Shimadzu Corporation: UV-315 and accessory integrating sphere unit: ISR-3100).
- a spectrophotometer eg, Shimadzu Corporation: UV-315 and accessory integrating sphere unit: ISR-3100.
- a 50W halogen lamp and deuterium lamp are used as the light source, the wavelength range is 200 to 1000 nm, the measurement range is 7 ⁇ 9 mm, the slit width is 20 nm, and measurement is performed without using a mask.
- the reflectance here is a relative value when the reflectance of the barium sulfate powder used as a reference is 100%.
- the light emitting element mounting substrate 1 of the present embodiment does not contain a transition metal in the grain boundary phase.
- the grain boundary phase does not contain a transition metal, it is possible to suppress a decrease in reflectance due to darkening of the substrate 1, and thus it can be suitably used for mounting a light emitting element.
- whether the grain boundary phase contains a transition metal can be determined by changing the applied spot from the crystal grain to the grain boundary phase in the same measurement method as that for obtaining the O / Al ratio described above. That's fine.
- the light-emitting element mounting substrate 1 of this embodiment has 100% of all constituent components when the component other than inevitable impurities is at least one kind of sintering aid component of silicon oxide, calcium oxide and magnesium oxide. It is preferable that aluminum oxide occupies 94 mass% or more when it is set as the mass%. Thus, when the aluminum oxide occupies 94% by mass or more, the glass phase by the sintering aid constituting the grain boundary phase 7 increases so that the incident light 11 is transmitted to the back surface of the substrate 1. Since the decrease in reflectance can be suppressed, the reflectance of incident light 11 can be kept high.
- the remainder excluding this barium oxide, the sintering aid component and inevitable impurities may be aluminum oxide.
- the aluminum oxide may be obtained by subtracting the content of oxides of other components from 100% by mass, and the aluminum oxide in this embodiment occupies 80% by mass or more in this calculation method. is there.
- FIG. 3 is a cross-sectional view showing an example of a configuration of a light emitting device in which a light emitting element is mounted on the light emitting element mounting substrate of the present embodiment.
- the light emitting device 21 of the present embodiment is obtained by mounting the light emitting element 2 on the light emitting element mounting substrate 1 of the present embodiment.
- electrodes 3a and 3b and electrode pads 3c and 3d are formed on the surface 1a of the substrate 1, and the light emitting element 2 made of a semiconductor is mounted on the electrode pad 3a. And the electrode pad 3 d are electrically connected by a bonding wire 4.
- the light-emitting element 2 may be mounted by bonding using a conductive adhesive, bonding by the bonding wire 4, or bonding by solder bumps as long as it can be electrically bonded.
- the light emitting element 2, the electrodes 3a and 3b, the electrode pads 3c and 3d, and the bonding wire 4 are covered with a sealing member 31 made of resin or the like.
- the electrodes 3a and 3b and the pad electrodes 3c and 3d are protected by a transparent overcoat glass, and the sealing member 31 has both the protection of the light emitting element 2 and the function of a lens.
- the light emitting device 21 of the present embodiment requires a configuration in which the light emitting element 2 is mounted on the substrate 1 of the present embodiment, and is not limited to the configuration of FIG.
- the light emitting element 2 is turned on by connecting the electrodes 3a, 3b (back electrodes) on the other surface of the substrate 1 to an external DC power source (not shown) or an AC-DC switching power source (not shown). Emits light.
- the sealing member 31 has a function as a lens that protects the light emitting element 2 and diffuses and emits light, but the sealing member 31 has a function of selectively converting the wavelength of light. Some of them have
- the light emitting element mounting substrate 1 of the present embodiment on which the light emitting element 2 is mounted has a low volume resistivity, and in the process of conductor formation, transportation, etc. Since there is little risk of static electricity being charged by contact or friction, there is little risk of electrostatic breakdown of the light emitting element 2 during mounting, and thus the light emitting device 21 with high reliability can be obtained.
- aluminum oxide (Al 2 O 3 ) powder having an average particle size of about 0.5 to 1.8 ⁇ m, and at least one powder of silicon oxide, calcium oxide (CaO) and magnesium oxide (MgO) as a sintering aid; Prepare. Then, when the total amount of aluminum oxide and sintering aid is 100% by mass, the sintering aid is weighed so that the total amount is 6% by mass or less and the balance is aluminum oxide, and used as a starting material.
- the weighed starting materials are put into a mill or the like containing high-purity alumina balls, and pulverized and mixed with a solvent such as water.
- a molding binder composed of at least one of paraffin wax, polyvinyl alcohol, polyethylene glycol, butyral resin, acrylic resin, etc. (these molding binders contain carbon) is added to 100 parts by mass of the starting material. Add about 4 to 8 parts by mass, and further rotate and mix to obtain a slurry.
- a sheet is formed by using this slurry by a doctor blade method, or a sheet is formed by a known powder press molding method or roll compaction method by using granules obtained by spray granulation of this slurry by a spray dryer.
- the sheet is processed by a mold or a laser for forming a product shape to obtain a molded body.
- the molded body is preferably a multi-piece molded body in consideration of mass productivity of the substrate 1.
- the obtained compact is degreased in an air (oxidation) atmosphere, and an inert gas atmosphere (inert gas is argon, etc.) or an oxygen concentration atmosphere can be adjusted to 5 to 20% by volume (for example, tungsten) It is fired at a maximum temperature in the range of 1420 to 1650 ° C using a batch-type atmosphere-controlled electric furnace using a heater.
- an inert gas atmosphere inert gas is argon, etc.
- an oxygen concentration atmosphere can be adjusted to 5 to 20% by volume (for example, tungsten) It is fired at a maximum temperature in the range of 1420 to 1650 ° C using a batch-type atmosphere-controlled electric furnace using a heater.
- the O / Al ratio can be adjusted by the firing atmosphere, and the average crystal grain size of the aluminum oxide crystal particles can be adjusted by the size of the starting material and the firing conditions.
- Aluminum oxide (Al 2 O 3 ) powder having an average particle size of 1.8 ⁇ m and silicon oxide (SiO 2 ), calcium oxide (CaO) and magnesium oxide (MgO) powders as a sintering aid were prepared. Then, 94% by mass of aluminum oxide, 3.5% by mass of silicon oxide, 1.5% by mass of calcium oxide and 1.0% by mass of magnesium oxide were weighed and used as starting materials. To this, a solvent and a molding binder made of an acrylic resin were added and mixed to obtain a slurry. Here, the addition amount of the molding binder was 6 parts by mass with respect to 100 parts by mass of the starting material.
- a sheet was formed by a known doctor blade method, and two molded bodies were obtained by punching this sheet with a mold.
- one molded body was placed in an electric furnace and baked at a maximum temperature of 1500 ° C. while adjusting the oxygen concentration atmosphere to 16% by volume.
- 1 light emitting element mounting substrate was obtained.
- the other molded body was fired with the firing atmosphere at the time of firing as an air atmosphere.
- a light emitting element mounting substrate 2 was obtained.
- the O / Al ratio was measured by TEM-EDS by the following method.
- the cross section was mirror-finished and then processed using an ion milling apparatus, and observed using a TEM at a magnification of 50,000 times, and arbitrary 10 aluminum oxide crystal particles were selected. Then, with the attached EDS, the spot diameter is 1 nm ⁇ , the measurement time is 50 seconds, the measurement energy width is 0.14 to 20.48 keV, the semiquantitative calculation method is the thin film approximation method, and the atomic weights of O and Al are measured. The O / Al ratio in each aluminum oxide crystal particle was calculated, and the average value was calculated.
- volume resistivity was measured with reference to the volume resistivity measurement described in JIS C 2141-1992.
- sample no. No. 1 has an O / Al ratio of 0.92 and a volume resistivity of 5 ⁇ 10 11 ⁇ ⁇ cm. 2 had an O / Al ratio of 1.5 and a volume resistivity of 1 ⁇ 10 14 ⁇ ⁇ cm. From this result, it was found that the volume resistivity can be lowered when the O / Al ratio is less than 1.5.
- a molded body was produced by the same process as in Example 1. Next, using an electric furnace, the oxygen concentration atmosphere was adjusted in the range of 5 to 20% by volume in accordance with the sample, and the respective compacts were fired. The maximum temperature during firing is 1500 ° C. 3 to 9 light emitting element mounting substrates were obtained.
- the calculation of the O / Al ratio and the measurement of the volume resistivity were performed in the same manner as in Example 1.
- a spectrophotometer is used, a 50 W halogen lamp and deuterium lamp are used as the light source, the wavelength range is 500 nm, the measurement range is 7 ⁇ 9 mm, the slit width is 20 nm, and no mask is used. It was measured.
- barium sulfate powder was used as a reference.
- Sample No. Nos. 4 to 7 have an O / Al ratio of 0.7 or more and 1.3 or less, so that the reflectance is 91% or more, the volume resistivity is less than 1 ⁇ 10 13 ⁇ ⁇ cm, and the low volume resistivity is high. It turned out that it is a light emitting element mounting board
- a molded body was produced by the same process as in Example 1. Next, using an electric furnace, the oxygen concentration atmosphere was set to 12% by volume, and the maximum temperature in the baking was adjusted to 1450 ° C. to 1550 ° C. according to the sample. As a result, sample no. 10 to 16 light emitting element mounting substrates were obtained.
- the volume resistivity was measured by the same method as in Example 1, and the reflectance was measured by the same method as in Example 2. Next, the average crystal grain size was measured by the following method.
- each sample was mirror-finished, and fire etching was performed at a temperature 80 ° C. lower than the maximum temperature in the firing process of each sample. Then, the area of each crystal particle of aluminum oxide is obtained by analyzing the image taken with an image analysis apparatus using an SEM, and at a magnification of 2500 times. The diameter (equivalent circle diameter) was calculated, and the average of the equivalent circle diameters was calculated as the average crystal grain size. The obtained results are shown in Table 2.
- sample No. Nos. 12 to 15 have a high reflectivity of 92% or more, and the average crystal grain size of aluminum oxide crystal particles is 0.7 ⁇ m or more and 2.0 ⁇ m or less, so that the volume resistivity is low.
- the volume resistivity is low.
- Powder A and powder B were prepared as two types of aluminum oxide powder. And sample No. 2 of Example 2 except having used these powders A and B. A sintered body was obtained by the same process as step 6. And the sintered compact produced using the powder A was made into sample No.2. 17, a sintered body produced using the powder B was sample No. 18.
- Example 2 the qualitative analysis of the grain boundary phase was performed by changing the spot to be applied from the crystal grain to the grain boundary phase when measuring the O / Al ratio by TEM-EDS performed in Example 1. Further, the reflectance was measured by the same method as in Example 2.
- the substrate used for mounting the light emitting element does not contain a transition metal in the grain boundary phase.
- sample no. The light emitting device was manufactured by forming the electrode 3a, the electrode pad 3c, and the like using 1 and 2 and mounting the light emitting element 2.
- the presence / absence of light emission from the element was regarded as the influence of electrostatic breakdown, and 200 pieces were confirmed.
- sample No. 1 than the light emitting device in which the light emitting element is mounted.
- the number of elements that did not emit light was clearly smaller in the light emitting device in which the light emitting elements were mounted on 2.
- the volume resistivity of the light emitting element mounting substrate 1 is low, it is possible to reduce the possibility of static electricity being charged by contact with or friction with equipment or the like in the process of forming or transporting the conductor. It was found that by using such a light emitting element mounting substrate 1, the risk of electrostatic breakdown of the light emitting element 2 at the time of mounting can be reduced, so that a highly reliable light emitting device can be obtained.
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Abstract
Description
1a:表面
1b:他方の表面
2:発光素子
3:導体
3a,3b:電極
3c,3d:電極パッド
4:ボンディングワイヤ
5,6:酸化アルミニウムの結晶粒子
5a,6a:界面
7:粒界相(ガラス層)
11:入射光
11a:内部を進行する光
13:反射光
13a,13c,13e:正反射光
13b,13d,13f:拡散反射光
21:発光装置
31:封止部材
Claims (5)
- 構成する全成分を100質量%としたとき、酸化アルミニウムが80質量%以上を占めるアルミナ質焼結体からなり、前記酸化アルミニウムの結晶粒子中のOとAlとの原子量の比であるO/Al比が1.5未満であることを特徴とする発光素子実装用基板。
- 前記O/Al比が0.7以上1.3以下であることを特徴とする請求項1に記載の発光素子実装用基板。
- 前記酸化アルミニウムの結晶粒子の平均結晶粒径が0.7μm以上2.0μm以下であることを特徴とする請求項1または請求項2に記載の発光素子実装用基板。
- 粒界相に遷移金属を含んでいないことを特徴とする請求項1乃至請求項3のいずれかに記載の発光素子実装用基板。
- 請求項1乃至請求項4のいずれかに記載の発光素子実装用基板に発光素子を実装してなることを特徴とする発光装置。
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CN201280046457.5A CN103828077B (zh) | 2011-09-29 | 2012-08-31 | 发光元件安装用基板及发光装置 |
US14/347,202 US20140240995A1 (en) | 2011-09-29 | 2012-08-31 | Light-emitting element mounting substrate and light emitting device |
EP12835862.9A EP2763199A4 (en) | 2011-09-29 | 2012-08-31 | SUBSTRATE FOR ASSEMBLING A LIGHT-EMITTING ELEMENT AND LIGHT-EMITTING DEVICE |
JP2013510435A JP5372293B2 (ja) | 2011-09-29 | 2012-08-31 | 発光素子実装用基板および発光装置 |
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US (1) | US20140240995A1 (ja) |
EP (1) | EP2763199A4 (ja) |
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Cited By (1)
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WO2019065726A1 (ja) * | 2017-09-28 | 2019-04-04 | 京セラ株式会社 | 発光素子実装用基板およびこれを備える発光素子実装用回路基板ならびに発光素子モジュール |
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- 2012-08-31 US US14/347,202 patent/US20140240995A1/en not_active Abandoned
- 2012-08-31 CN CN201280046457.5A patent/CN103828077B/zh not_active Expired - Fee Related
- 2012-08-31 JP JP2013510435A patent/JP5372293B2/ja active Active
- 2012-08-31 WO PCT/JP2012/072197 patent/WO2013047087A1/ja active Application Filing
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2019065726A1 (ja) * | 2017-09-28 | 2019-04-04 | 京セラ株式会社 | 発光素子実装用基板およびこれを備える発光素子実装用回路基板ならびに発光素子モジュール |
JPWO2019065726A1 (ja) * | 2017-09-28 | 2020-02-06 | 京セラ株式会社 | 発光素子実装用基板およびこれを備える発光素子実装用回路基板ならびに発光素子モジュール |
CN111164059A (zh) * | 2017-09-28 | 2020-05-15 | 京瓷株式会社 | 发光元件安装用基板及具备其的发光元件安装用电路基板、以及发光元件模块 |
US11769864B2 (en) | 2017-09-28 | 2023-09-26 | Kyocera Corporation | Substrate for mounting a light-emitting element and circuit board for mounting a light-emitting element that includes it, and light-emitting element module |
Also Published As
Publication number | Publication date |
---|---|
JPWO2013047087A1 (ja) | 2015-03-26 |
US20140240995A1 (en) | 2014-08-28 |
CN103828077A (zh) | 2014-05-28 |
JP5372293B2 (ja) | 2013-12-18 |
EP2763199A1 (en) | 2014-08-06 |
CN103828077B (zh) | 2016-10-12 |
EP2763199A4 (en) | 2015-06-17 |
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