WO2015098555A1 - Substrat en céramique pour monter des éléments d'émission de lumière, et dispositif d'émission de lumière - Google Patents

Substrat en céramique pour monter des éléments d'émission de lumière, et dispositif d'émission de lumière Download PDF

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WO2015098555A1
WO2015098555A1 PCT/JP2014/082893 JP2014082893W WO2015098555A1 WO 2015098555 A1 WO2015098555 A1 WO 2015098555A1 JP 2014082893 W JP2014082893 W JP 2014082893W WO 2015098555 A1 WO2015098555 A1 WO 2015098555A1
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ceramic substrate
mass
equivalent circle
circle diameter
light
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PCT/JP2014/082893
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English (en)
Japanese (ja)
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株式会社北陸セラミック
茂裕 河浦
文男 石田
一弘 渡邊
卓也 山下
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日本カーバイド工業株式会社
株式会社北陸セラミック
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Publication of WO2015098555A1 publication Critical patent/WO2015098555A1/fr

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    • 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

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  • the present invention relates to a ceramic substrate for mounting a light emitting element and a light emitting device.
  • a ceramic substrate is used as a substrate for mounting an LED (light emitting diode) which is one of the light emitting elements. Since this board
  • Examples of the ceramic substrate having excellent light reflection performance include a substrate mainly made of aluminum oxide.
  • International Publication No. 2010/001760 discloses that an alumina ceramic containing a Ba 0.808 Al 1.71 Si 2.29 O 8 phase is excellent in light reflection performance.
  • International Publication No. 2011/013808 is a ceramic substrate having a reflectivity of 90% or more in the region from ultraviolet to infrared, and is mainly composed of aluminum oxide, and a circular surface at a surface area of 9.074 ⁇ 105 ⁇ m 2 on the surface.
  • pores having an equivalent diameter of 0.8 ⁇ m or more are viewed, the porosity is 2.5% or more and 4.5% or less, the number of pores is 7000 or more and 11000 or less, and the equivalent circle diameter in the pore distribution is 1. What satisfies the requirement that the cumulative relative frequency of 6 ⁇ m or less is 70% or more is disclosed.
  • International Publication No. 2010/001760 improves the light reflection performance by adding a specific crystal phase to alumina ceramic, and does not pay attention to the relationship between the state of pores and the light reflection performance.
  • International Publication No. 2011/013808 focuses on pores having an equivalent circle diameter of 0.8 ⁇ m or more on the surface of the ceramic substrate, and its porosity, number of pores and pore distribution are specified, but the equivalent circle diameter is 0.8 ⁇ m. Details of smaller pores are not disclosed.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a ceramic substrate for mounting a light emitting element and a light emitting device, which are excellent in light reflection performance.
  • the content of aluminum oxide is 75% by mass or more, and at least one surface side has a mounting portion for mounting a light emitting element, and the surface on the side having the mounting portion has the following conditions:
  • a ceramic substrate for mounting light-emitting elements which has a region that satisfies all the requirements.
  • the porosity of a pore having an equivalent circle diameter of 0.1 ⁇ m or more is 2% to 7%.
  • the average value A of the equivalent circle diameter of pores having an equivalent circle diameter of 0.1 ⁇ m or more is in the range of 0.1 ⁇ m to 0.9 ⁇ m.
  • the equivalent circle diameter of pores corresponding to 80% or more of the pores having an equivalent circle diameter of 0.1 ⁇ m or more is in the range of A ⁇ 0.3 ⁇ m.
  • ⁇ 2> The ceramic substrate for mounting a light-emitting element according to ⁇ 1>, wherein the average value A is in a range of 0.1 ⁇ m to 0.7 ⁇ m.
  • the average value B of equivalent circle diameters of aluminum oxide crystal particles having an equivalent circle diameter of 0.3 ⁇ m or more is in the range of 0.3 ⁇ m to 2.0 ⁇ m.
  • the equivalent circle diameter of aluminum oxide crystal particles corresponding to 80% or more of the aluminum oxide crystal particles having an equivalent circle diameter of 0.3 ⁇ m or more is in the range of B ⁇ 0.5 ⁇ m.
  • ⁇ 4> Any one of ⁇ 1> to ⁇ 3>, wherein the content of silicon oxide is 1% by mass to 20% by mass, and the content of barium element in terms of barium oxide is 1% by mass to 20% by mass 2.
  • a light emitting device including the light emitting element mounting ceramic substrate according to any one of ⁇ 1> to ⁇ 4>, and a light emitting element mounted on a mounting portion of the light emitting element mounting ceramic substrate.
  • the present invention it is possible to provide a ceramic substrate for mounting a light emitting element and a light emitting device that are excellent in light reflection performance.
  • the term “process” is not limited to an independent process, and is included in the term if the intended purpose of the process is achieved even when it cannot be clearly distinguished from other processes. .
  • a numerical range indicated using “to” indicates a range including the numerical values described before and after “to” as the minimum value and the maximum value, respectively.
  • the amount of each component in the composition is the total amount of the plurality of substances present in the composition unless there is a specific indication when there are a plurality of substances corresponding to each component in the composition. means.
  • the particle diameter of aluminum oxide, silicon oxide, etc. means the number average particle diameter.
  • the pore diameter means an average value of equivalent circle diameters of pores having an equivalent circle diameter of 0.1 ⁇ m or more.
  • the ceramic substrate for mounting a light emitting element of the present invention (hereinafter also referred to as a ceramic substrate) has an aluminum oxide content of 75% by mass or more and has a mounting portion on the surface for mounting the light emitting element, The mounting portion has a region that satisfies all of the following conditions.
  • the porosity of a pore having an equivalent circle diameter of 0.1 ⁇ m or more is 2% to 7%.
  • the average value A of the equivalent circle diameter of pores having an equivalent circle diameter of 0.1 ⁇ m or more is in the range of 0.1 ⁇ m to 0.9 ⁇ m.
  • the equivalent circle diameter of pores corresponding to 80% or more of the pores having an equivalent circle diameter of 0.1 ⁇ m or more is in the range of A ⁇ 0.3 ⁇ m.
  • a ceramic substrate that satisfies the above conditions is excellent in light reflection performance.
  • the ceramic substrate of the present invention has smaller pore sizes and smaller variations in size than conventional ceramic substrates. The presence of such pores suggests that the area of the interface between the pores serving as light reflecting surfaces and the aluminum oxide crystal particles is larger than that of the conventional ceramic substrate. As a result, it is assumed that a higher light reflectance than that of the conventional ceramic substrate is realized. However, such a guess does not limit the scope of the present invention.
  • the “pore” means a portion which is a void without the presence of aluminum oxide crystal particles, glass or the like forming the ceramic substrate.
  • the size and distribution of pores of the ceramic substrate can be known by measuring the size and distribution of pores that are openings on the surface of the ceramic substrate.
  • FIG. 1 is an example of a micrograph of the surface of the ceramic substrate of the present invention. The portion shown in black in the photograph corresponds to the opening (pore).
  • the “mounting portion” means a region including a place where a light emitting element is mounted and its periphery on the surface of the ceramic substrate.
  • the shape of the mounting portion is not particularly limited as long as the light emitting element can be mounted. For example, it may be flat or recessed. In the case where the mounting portion has a recessed shape, both the bottom surface portion on which the light emitting element is placed and the side surface portion surrounding the periphery of the light emitting element correspond to the mounting portion.
  • the equivalent circle diameter, porosity, pore distribution and the like of the pores of the ceramic substrate of the present invention can be measured by a method including the following steps. (1) The surface of the ceramic substrate is polished by ion milling or the like. (2) The polished surface is observed with an SEM (scanning electron microscope), and the obtained image is taken into a CCD camera. (3) The image captured by the CCD camera is binarized and analyzed using image analysis software.
  • FIG. 2 is an example of an enlarged photograph of the surface obtained by polishing the ceramic substrate of the present invention obtained by setting the observation magnification of SEM to 2000 times and the observation area to 50 ⁇ m ⁇ 63 ⁇ m (3150 ⁇ m 2 ).
  • the black portions correspond to the pores.
  • the image analysis software for example, “A image-kun (trade name), Asahi Kasei Engineering Co., Ltd.” can be used, and the minimum graphic area can be set to 0.01 ⁇ m 2 as analysis conditions.
  • the ceramic substrate of the present invention has a region having a porosity of 2% to 7% when viewed with respect to pores having an equivalent circle diameter of 0.1 ⁇ m or more on the surface on the side having the mounting portion.
  • the porosity is a ratio (%) of the total area of pores having an equivalent circle diameter of 0.1 ⁇ m or more obtained by image analysis to the observation area. If the porosity is less than 2%, the area of the interface between the pores and the crystal particles may be extremely low, and a high reflectance may not be obtained. If the porosity is 7% or more, water absorption may be exhibited. From the viewpoint of achieving both improvement in reflectance and suppression of water absorption, the porosity is preferably 3% to 6%, more preferably 3% to 5.5%, and more preferably 4% to 5%. More preferably.
  • an area where the average value A of the equivalent circle diameter of the pores having an equivalent circle diameter of 0.1 ⁇ m or more is in the range of 0.1 ⁇ m to 0.9 ⁇ m is formed on the surface having the mounting portion.
  • the average value A is larger than 0.9 ⁇ m, the area of the interface between the pores serving as the light reflection surface and the crystal particles cannot be sufficiently obtained, and sufficient light reflectance may not be obtained.
  • the average value A is preferably 0.7 ⁇ m or less, more preferably 0.5 ⁇ m or less, and further preferably 0.4 ⁇ m or less.
  • the average value A is preferably 0.2 ⁇ m or more, more preferably 0.3 ⁇ m or more, and further preferably 0.35 ⁇ m or more. Furthermore, by making the average value A equal to or less than the wavelength range of visible light (approximately 400 nm to 700 nm), irregular reflection (diffuse reflection) of light can be suppressed, and visible light can be reflected more efficiently. Become.
  • a region where the equivalent circle diameter of the pores corresponding to 80% or more of the pores having an equivalent circle diameter of 0.1 ⁇ m or more is within the range of the average value A ⁇ 0.3 ⁇ m is provided on the mounting portion. It has on the surface of the side to have. If the number of pores having an equivalent circle diameter in the range of A ⁇ 0.3 ⁇ m is less than 80%, the area of the interface between the pores serving as the light reflecting surface and the crystal particles cannot be obtained sufficiently, and sufficient The light reflectance may not be obtained.
  • the equivalent circle diameter of the pores corresponding to 85% or more of the pores having an equivalent circle diameter of 0.1 ⁇ m or more is within the range of the average value A ⁇ 0.3 ⁇ m.
  • the equivalent circle diameter of pores corresponding to 90% or more of the pores having an equivalent circle diameter of 0.1 ⁇ m or more is more preferably within the range of the average value A ⁇ 0.3 ⁇ m, and the equivalent circle diameter is 0. More preferably, the equivalent circle diameter of the pores corresponding to 95% or more of the pores of 1 ⁇ m or more is within the range of the average value A ⁇ 0.3 ⁇ m.
  • the above “%” is based on the number.
  • the ceramic substrate of the present invention has an aluminum oxide content of 75% by mass or more. If the content of aluminum oxide is less than 75% by mass, the content of glass components such as SiO 2 that is a sintering aid increases, so that the thermal conductivity (heat dissipation) may deteriorate. From the viewpoint of realizing high heat dissipation, the aluminum oxide content is preferably 80% by mass or more, and more preferably 85% by mass or more.
  • Aluminum oxide exists as crystal particles in the ceramic substrate.
  • the average value B of equivalent circle diameters of aluminum oxide crystal particles having an equivalent circle diameter of 0.3 ⁇ m or more is in the range of 0.3 ⁇ m to 2.0 ⁇ m, and the equivalent circle diameter is It is preferable that the equivalent circle diameter of the aluminum oxide crystal particles corresponding to 80% or more of the aluminum oxide crystal particles of 0.3 ⁇ m or more is in a range of B ⁇ 0.5 ⁇ m.
  • the average value B is preferably 1.8 ⁇ m or less, more preferably 1.5 ⁇ m or less, and even more preferably 1.0 ⁇ m or less.
  • the equivalent circle diameter of the aluminum oxide crystal particles corresponding to 85% or more of the aluminum oxide crystal particles having an equivalent circle diameter of 0.3 ⁇ m or more is preferably within the range of the average value B ⁇ 0.5 ⁇ m. More preferably, the equivalent circle diameter of the aluminum oxide crystal particles corresponding to 90% or more of the aluminum oxide crystal particles having an equivalent diameter of 0.3 ⁇ m or more is in the range of the average value B ⁇ 0.5 ⁇ m.
  • the above “%” is based on the number.
  • the equivalent circle diameter of the aluminum oxide crystal particles can be measured by the same method as the measurement method of the equivalent circle diameter of the pores described above.
  • the ceramic substrate of the present invention preferably contains silicon oxide.
  • silicon oxide By including silicon oxide, sintering is promoted and the mechanical strength of the ceramic substrate tends to be improved. Furthermore, the water absorption rate of the ceramic substrate tends to decrease.
  • the content is preferably 1% by mass or more, more preferably 3% by mass or more, and further preferably 5% by mass or more.
  • the content of silicon oxide is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less. .
  • the ceramic substrate of the present invention preferably contains a barium element.
  • the particle diameter of aluminum oxide crystal particles contained in the ceramic substrate tends to be smaller and the particle diameter tends to be more uniform. This is because the growth of aluminum oxide particles during sintering is suppressed by barium.
  • the content is preferably 1% by mass or more, more preferably 3% by mass or more, and more preferably 5% by mass or more in terms of barium oxide (BaO). More preferably. From the viewpoint of sufficiently ensuring the content of aluminum oxide, the content of barium oxide is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less. .
  • the form of the barium element is not particularly limited. From the viewpoint of improving the light reflectivity, it is preferably contained in the form of Ba 0.808 Al 1.71 Si 2.29 O 8 .
  • the form of barium element contained in the slurry before firing is not particularly limited, and barium such as barium carbonate, barium hydride, barium fluoride, barium chloride, barium hydroxide, barium oxide, barium chlorate, barium sulfate, and barium nitrate. A compound can be mentioned. From the viewpoint of chemical stability and safety of gas generated by thermal decomposition during firing, barium carbonate is preferable. These barium compounds may be used alone or in combination of two or more.
  • the ceramic substrate of the present invention may contain an element or compound other than aluminum oxide, silicon oxide and barium elements within the range where the effects of the present invention are not impaired.
  • elements such as magnesium, titanium, calcium, zirconium, tin, and compounds containing these elements can be given.
  • a slurry containing the above-described aluminum oxide and other raw materials contained as necessary is prepared, the obtained slurry is converted into a green sheet, and the obtained green sheet is fired (Green sheet method), a method (powder molding method) of firing a molded body obtained by filling raw material powder in a mold and pressurizing.
  • Green sheet method a method for producing a ceramic substrate of the present invention.
  • the method for producing a ceramic substrate by the green sheet method includes a slurry adjustment step, a drying step, and a firing step described below, and includes other steps as necessary.
  • a dispersion medium, a binder resin, a dispersant, a plasticizer, and the like are added to an aluminum oxide powder and raw powders such as silicon oxide powder and barium compound powder that are included as necessary, and kneaded to obtain a slurry.
  • the method of kneading is not particularly limited, and can be performed using a ball mill or the like.
  • the particle diameter of the raw material powder contained in the slurry can be controlled within a desired range.
  • the pulverization step can be performed by, for example, a ball mill or the like by mixing the raw material powder alone or in combination of two or more kinds with a dispersion medium.
  • the kind of aluminum oxide powder is not particularly limited, and can be selected from those usually used for the production of ceramic substrates. You may combine the aluminum oxide powder from which a kind or average particle diameter differs. From the viewpoint of controlling the porosity and the equivalent circle diameter of the pores to be more effectively within a desired range, the particle diameter of the aluminum oxide contained in the slurry is preferably 1.5 ⁇ m or less, and 1.0 ⁇ m or less. It is more preferable that it is 0.5 ⁇ m or less. On the other hand, from the viewpoints of powder handleability and cost, the particle diameter of aluminum oxide contained in the slurry is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, and 0.3 ⁇ m or more. More preferably it is. You may use what performed the grinding
  • the particle diameter of aluminum oxide tends to grow and grow during firing. Therefore, it is preferable that the particle diameter of the aluminum oxide contained in the slurry before firing is smaller than the average particle diameter of the aluminum oxide crystal particles contained in the ceramic substrate obtained by firing.
  • the kind in particular of silicon oxide powder is not restrict
  • the particle diameter of silicon oxide contained in the slurry is preferably 0.1 ⁇ m or more, more preferably 0.3 ⁇ m or more, and 0.5 ⁇ m or more. More preferably. You may use what grind
  • barium compound powder The kind in particular of barium compound powder is not restrict
  • the barium compound include barium carbonate, barium hydride, barium fluoride, barium chloride, barium hydroxide, barium oxide, barium chlorate, barium sulfate, and barium nitrate. From the viewpoint of chemical stability and safety of gas generated by thermal decomposition during firing, barium carbonate is preferable. You may combine the barium compound powder from which a kind or average particle diameter differs. Viewpoint of making both light reflectance improvement and water absorption reduction more effective both effective by Ba 0.808 Al 1.71 Si 2.29 O 8 phase obtained with firing filling the gaps between the aluminum oxide particles.
  • the particle diameter of the barium compound contained in the slurry is preferably 2.0 ⁇ m or less, more preferably 1.8 ⁇ m or less, and even more preferably 1.5 ⁇ m or less.
  • the particle diameter of the barium compound contained in the slurry is preferably 0.3 ⁇ m or more, more preferably 0.5 ⁇ m or more, and 1.0 ⁇ m or more. More preferably it is. You may use what carried out the grinding
  • the binder resin is not particularly limited, and acrylic resin, PVB (polyvinyl butyral) resin, or the like can be used.
  • the content of the binder resin in the slurry is preferably 4.0% by mass to 20.0% by mass and more preferably 6.0% by mass to 14.0% by mass in the total solid content of the slurry. preferable.
  • Binder resin may be used individually by 1 type, or may use 2 or more types together.
  • the dispersant is not particularly limited, and for example, a surfactant such as a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a polymer surfactant can be used.
  • the content of the dispersant in the slurry is preferably 0.1% by mass to 1.0% by mass and more preferably 0.3% by mass to 0.5% by mass in the total solid content of the slurry. preferable.
  • a dispersing agent may be used individually by 1 type, or may use 2 or more types together.
  • the plasticizer is not particularly limited, and phthalic acid esters such as DOP (dioctyl phthalate) and DBP (dibutyl phthalate), and adipic acid esters such as DOA (dioctyl adipate) can be used.
  • the content of the plasticizer in the slurry is preferably 3.0% by mass to 15.0% by mass and more preferably 4.0% by mass to 6.0% by mass in the total solid content of the slurry. preferable.
  • a plasticizer may be used individually by 1 type, or may use 2 or more types together.
  • the dispersion medium is not particularly limited, and for example, alcohol solvents such as methanol and ethanol, aromatic solvents such as toluene, ketone solvents such as methyl ethyl ketone and acetone can be used.
  • the amount of the dispersion medium added is preferably such that the total amount of solid content of the slurry is 70% by mass to 80% by mass.
  • the viscosity of the slurry is preferably 3,000 cps to 30,000 cps, and more preferably added so as to be 10,000 cps to 20,000 cps.
  • a dispersion medium may be used individually by 1 type, or may use 2 or more types together.
  • the obtained slurry is applied on a film such as PET (polyethylene terephthalate) coated with a release agent so as to have a desired thickness by a doctor blade method, a calender roll method or the like, and dried in a drying furnace or the like.
  • the dispersion medium is evaporated.
  • the drying step is preferably performed at 80 ° C. to 130 ° C., more preferably 100 ° C. to 120 ° C.
  • the drying speed is preferably 0.2 m / min to 2.0 m / min.
  • the amount of slurry applied can be selected according to the desired thickness of the fired ceramic substrate.
  • the firing temperature can be selected from a range of 1400 ° C. to 1600 ° C., for example. In one embodiment, the firing temperature is preferably 1550 ° C. or lower, and more preferably 1525 ° C. or lower.
  • the firing time is not particularly limited, and can be selected within a range in which a ceramic substrate that satisfies the requirements of the present invention can be obtained.
  • the temperature raising time can be 14 to 18 hours
  • the holding time at the firing temperature can be 1 to 3 hours
  • the temperature lowering time can be 5 to 10 hours.
  • the ceramic substrate of the present invention can be obtained by cooling after firing. If desired, the surface may be polished using a sandblasting machine or the like.
  • the thickness of the ceramic substrate of the present invention is not particularly limited and can be selected according to the application. For example, it can be in the range of 0.1 mm to 1.0 mm.
  • the ceramic substrate of the present invention may have an uneven shape on the surface.
  • Such a ceramic substrate can be produced by bringing a mold into contact with a green sheet before firing and applying a pressurization to give an uneven shape.
  • a light emitting element mounting ceramic substrate having a recessed mounting portion can be manufactured.
  • a ceramic substrate for mounting a light-emitting element in which the mounting portion is recessed is obtained by sintering a green sheet having an opening at a place corresponding to the mounting portion overlaid on another green sheet. It can also be manufactured.
  • the light emitting device of the present invention includes the ceramic substrate for mounting the light emitting element of the present invention and the light emitting element mounted on the mounting portion of the ceramic substrate for mounting the light emitting element of the present invention.
  • the light emitting element include a light emitting diode (LED) and a semiconductor laser (LD).
  • Specific examples of the light-emitting device include indoor and outdoor lighting devices, electronic bulletin boards, and the like that use the light-emitting device of the present invention as a light source. Since the light emitting device of the present invention includes the ceramic substrate of the present invention, it has excellent luminous efficiency.
  • Example 1 8 parts by mass of high-purity barium carbonate (particle size: 1.5 ⁇ m, Nippon Chemical Industry Co., Ltd.) 30 parts by mass of a mixed solvent (toluene 37.5% by mass, methyl ethyl ketone 37.5% by mass, methanol 12.5% by mass) And 12.5% by mass of acetone) to prepare a dispersion, and the first pulverization step was performed with a ball mill for 10 hours.
  • a mixed solvent toluene 37.5% by mass, methyl ethyl ketone 37.5% by mass, methanol 12.5% by mass
  • the obtained slurry was applied on a PET film coated with a release agent by a doctor blade method so as to have a thickness of 2.4 mm, dried at 110 ° C., and then peeled off to obtain a green sheet.
  • the obtained green sheet was put into a firing furnace, heated for 15 hours, held at 1500 ° C. for 2 hours, and fired by lowering the temperature for 7 hours to obtain a ceramic substrate.
  • Example 2 In Example 1, a ceramic substrate was obtained by the same method as in Example 1 except that the firing temperature was changed to 1550 ° C.
  • Example 3 In Example 1, a ceramic substrate was obtained by the same method as in Example 1 except that the firing temperature was changed to 1450 ° C.
  • Example 4 In Example 1, a ceramic substrate was obtained by the same method as in Example 1 except that the mass of barium carbonate was changed to 4 parts by mass.
  • Example 5 a ceramic substrate was obtained by the same method as in Example 1 except that the mass of barium carbonate was changed to 12 parts by mass.
  • Example 6 In Example 1, a ceramic substrate was obtained by the same method as in Example 1 except that the mass of barium carbonate was changed to 16 parts by mass.
  • Comparative Example 1 8 parts by mass of high-purity barium carbonate (particle size: 1.5 ⁇ m, Nippon Chemical Industry Co., Ltd.) 30 parts by mass of a mixed solvent (toluene 37.5% by mass, methyl ethyl ketone 37.5% by mass, methanol 12.5% by mass) And 12.5% by mass of acetone) to prepare a dispersion, and the first pulverization step was performed with a ball mill for 10 hours.
  • a mixed solvent toluene 37.5% by mass, methyl ethyl ketone 37.5% by mass, methanol 12.5% by mass
  • a plasticizer dioctyl adipate, Taoka Chemical Co., Ltd.
  • a binder resin polyvinyl butyral, Sekisui Chemical Co., Ltd.
  • a slurry was prepared by the above steps.
  • the obtained slurry was applied on a PET film coated with a release agent by a doctor blade method so as to have a thickness of 2.4 mm, dried at 110 ° C., and then peeled off to obtain a green sheet.
  • the obtained green sheet was put into a firing furnace, heated for 15 hours, held at 1600 ° C. for 2 hours, and fired by lowering the temperature for 7 hours to obtain a ceramic substrate.
  • Example 2 a ceramic substrate was obtained by the same method as in Example 1 except that the firing temperature was changed to 1600 ° C.
  • Example 3 a ceramic substrate was obtained by the same method as in Example 1 except that the firing temperature was changed to 1400 ° C.
  • Example 4 a ceramic substrate was obtained by the same method as in Example 1 except that the firing temperature was changed to 1450 ° C. and the mass of barium carbonate was changed to 12 parts by mass.
  • Example 5 a ceramic substrate was obtained by the same method as in Example 1 except that the firing temperature was changed to 1450 ° C. and the mass of barium carbonate was changed to 16 parts by mass.
  • the ceramic substrates of Examples 1 to 6 that satisfy the requirements of the ceramic substrate of the present invention had high light reflectivity and good evaluation of water absorption.
  • Comparative example 1 in which the average value A of the equivalent circle diameters of the pores exceeds 0.9 ⁇ m, and the ratio of the pores having an equivalent circle diameter of A ⁇ 0.3 ⁇ m is less than 80%, the porosity is 2%
  • Comparative Example 2 is less than Comparative Example 2
  • Comparative Example 4 in which the proportion of pores having an equivalent circle diameter in the range of A ⁇ 0.3 ⁇ m is less than 80%, and the average value A of equivalent circle diameters of the pores exceeds 0.9 ⁇ m
  • the ceramic substrate of Comparative Example 5 was inferior to the ceramic substrate of the example in the evaluation of light reflectance.
  • Comparative Example 3 in which the porosity exceeded 7%, the evaluation of the water absorption rate was poor.

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Abstract

L'invention concerne un substrat en céramique pour monter des éléments d'émission de lumière qui présente d'excellentes performances de réflexion de la lumière; et un dispositif d'émission de lumière comprenant ledit substrat en céramique. Le substrat en céramique a une teneur en oxyde d'aluminium d'au moins 75 % en masse, et possède, située sur au moins l'un de ses côtés, une section de montage pour monter un élément d'émission de lumière sur celle-ci. La surface au niveau du côté où la section de montage est située comporte une surface qui satisfait toutes les conditions suivantes : (1) que la porosité lorsque l'on observe des pores ayant un diamètre de cercle équivalent d'au moins 0,1 µm soit de 2 à 7 %; (2) que la valeur moyenne du diamètre de cercle équivalent (A) des pores ayant un diamètre de cercle équivalent d'au moins 0,1 µm soit dans la plage de 0,1 à 0,9 µm; et (3) que le diamètre de cercle équivalent d'au moins 80 % des pores ayant un diamètre de cercle équivalent d'au moins 0,1 µm soit dans la plage de A±0,3 µm.
PCT/JP2014/082893 2013-12-26 2014-12-11 Substrat en céramique pour monter des éléments d'émission de lumière, et dispositif d'émission de lumière WO2015098555A1 (fr)

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JP2013-269955 2013-12-26
JP2013269955A JP2017037868A (ja) 2013-12-26 2013-12-26 発光素子搭載用セラミック基板及び発光装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006287132A (ja) * 2005-04-04 2006-10-19 Kyoritsu Elex Co Ltd 発光ダイオード用パッケージ及び発光ダイオード
JP2007284333A (ja) * 2006-03-20 2007-11-01 Sumitomo Metal Electronics Devices Inc 高反射白色セラミックス及びリフレクター及び半導体発光素子搭載用基板及び半導体発光素子収納用パッケージ
JP2009206466A (ja) * 2008-01-30 2009-09-10 Kyocera Corp 発光素子収納用パッケージおよび発光装置
WO2010001760A1 (fr) * 2008-06-30 2010-01-07 日本カーバイド工業株式会社 Céramique d'alumine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006287132A (ja) * 2005-04-04 2006-10-19 Kyoritsu Elex Co Ltd 発光ダイオード用パッケージ及び発光ダイオード
JP2007284333A (ja) * 2006-03-20 2007-11-01 Sumitomo Metal Electronics Devices Inc 高反射白色セラミックス及びリフレクター及び半導体発光素子搭載用基板及び半導体発光素子収納用パッケージ
JP2009206466A (ja) * 2008-01-30 2009-09-10 Kyocera Corp 発光素子収納用パッケージおよび発光装置
WO2010001760A1 (fr) * 2008-06-30 2010-01-07 日本カーバイド工業株式会社 Céramique d'alumine

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