WO2016148004A1 - 発光装置製造方法 - Google Patents
発光装置製造方法 Download PDFInfo
- Publication number
- WO2016148004A1 WO2016148004A1 PCT/JP2016/057527 JP2016057527W WO2016148004A1 WO 2016148004 A1 WO2016148004 A1 WO 2016148004A1 JP 2016057527 W JP2016057527 W JP 2016057527W WO 2016148004 A1 WO2016148004 A1 WO 2016148004A1
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- WIPO (PCT)
- Prior art keywords
- led element
- wiring board
- conductive adhesive
- anisotropic conductive
- temperature
- Prior art date
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Classifications
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- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- H—ELECTRICITY
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- 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
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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
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
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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
- H01L33/64—Heat extraction or cooling elements
- H01L33/641—Heat extraction or cooling elements characterized by the materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
- H01L2224/29298—Fillers
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- 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
- H01L2924/06—Polymers
- H01L2924/078—Adhesive characteristics other than chemical
- H01L2924/0781—Adhesive characteristics other than chemical being an ohmic electrical conductor
- H01L2924/07811—Extrinsic, i.e. with electrical conductive fillers
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- 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
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12041—LED
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10106—Light emitting diode [LED]
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- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
Definitions
- the present invention relates to a technique for manufacturing a light emitting device using an LED element, and more particularly to a technique for fixing an LED element having a phosphor layer to a wiring board.
- Solutions include applying flux to the surface of the wiring board and applying a load during reflow.
- the phosphor layer is liable to peel off during flux cleaning, and the load is applied at high temperatures. If this is done, there is a problem that the phosphor layer collapses.
- the present invention was created in order to solve the disadvantages of the prior art described above, and an object thereof is to provide a technique for obtaining a light emitting device without destroying a phosphor layer.
- the inventor of the present invention is that the epoxy-modified silicone resin proceeds at a lower temperature when the metal chelate compound is used as the curing agent than when the acid anhydride or imidazole compound is used as the curing agent.
- the reason why the phosphor layer collapses when the LED layer and the wiring board are temporarily connected is that the thermocompression bonding takes a long time or the thermocompression bonding temperature is high.
- the temperature of the wiring board at the time of temporary connection and the adoption of a metal chelate compound it is possible to temporarily manufacture an LED element using an anisotropic conductive adhesive.
- the present invention invented the present invention in which the epoxy-modified silicone resin contained in the anisotropic conductive adhesive is polymerized by a metal chelate compound in a short time at a low temperature in the connecting step. In order to lower the temperature of the phosphor layer, it is also possible to adopt a temperature lower than that of the wiring board.
- the present invention is arranged on a wiring board, an arrangement step of arranging an LED element on an anisotropic conductive adhesive containing a polymerization component and a curing agent, and a predetermined pressing time for the LED element, A primary heating step in which the anisotropic conductive adhesive is heated while being pressed by a pressure body, a part of the polymerization component is polymerized by the curing agent, and the LED element is temporarily connected to the wiring board. And the temporarily connected wiring board, the anisotropic conductive adhesive, and the LED element are heated, the polymerization component is polymerized, the anisotropic conductive adhesive is cured, and the main connection is performed.
- the LED element has a phosphor layer, the polymerization component contains an epoxy-modified silicone resin, and the curing agent contains a metal chelate.
- the present invention is a light emitting device manufacturing method, wherein the pressing time is 60 seconds or less.
- the present invention is any one of the above light emitting device manufacturing methods, wherein the temperature of the wiring board in the secondary heating step is lower than the temperature of the wiring board in the primary heating step, and the secondary heating is performed.
- the heating time for heating the wiring board in the step is a method for manufacturing a light emitting device, wherein the heating time is longer than the pressing time.
- the present invention is any one of the above-described light emitting device manufacturing methods, wherein the pressurizing body maintains a temperature of 20 ° C. or higher and 40 ° C. or lower.
- the anisotropic conductive adhesive used in the present invention is made of a conductive paste, and contains an epoxy-modified silicone resin that is a binder resin, a metal chelate that is a latent curing agent, and a metal component that is a conductive component. .
- This anisotropic conductive adhesive does not contain a flux.
- An epoxy-modified silicone resin that is a binder resin is preferable because of its high viscosity stability and high heat resistance.
- an epoxy-modified silicone resin for example, diglycidyl isocyanuryl-modified polysiloxane represented by the following general formula (1) can be used.
- R is an alkyl group such as a lower alkyl group having 1 to 6 carbon atoms, or an aryl group such as a carbocyclic aromatic group or a heterocyclic aromatic group.
- the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and an isobutyl group, and a particularly preferable alkyl group is a methyl group.
- a preferred specific example of the aryl group is a phenyl group.
- n is a number of 1 to 40, preferably a number of 1 to 9, more preferably a number of 1 or 2.
- the epoxy-modified silicone resin is a heterocyclic epoxy compound, an alicyclic epoxy compound, or a hydrogenated epoxy as long as the effects of the present invention are not impaired.
- a compound etc. can be contained.
- heterocyclic epoxy compound examples include an epoxy compound having a triazine ring.
- 6- (1H, 3H, 5H) -trione in other words triglycidyl isocyanurate.
- Preferred examples of the alicyclic epoxy compound include those having two or more epoxy groups in the molecule. These may be liquid or solid. Specific examples include glycidyl hexahydrobisphenol A, 3,4-epoxycyclohexenylmethyl-3 ′, 4′-epoxycyclohexene carboxylate, and the like. Among these, glycidyl hexahydrobisphenol A, 3,4-epoxycyclohexenylmethyl-3 ′, 4 is preferable because it can ensure light transmission suitable for mounting LED elements on the cured product and is excellent in rapid curing. '-Epoxycyclohexenecarboxylate can be preferably used. *
- the hydrogenated epoxy compound the above-mentioned heterocyclic epoxy compounds, hydrogenated products of alicyclic epoxy compounds, and other known hydrogenated epoxy compounds can be used.
- These alicyclic epoxy compounds, heterocyclic epoxy compounds and hydrogenated epoxy compounds may be used alone or in combination with the diglycidyl isocyanuryl-modified polysiloxane of the general formula (1). You may use together.
- other epoxy compounds may be used in combination as long as the effects of the present invention are not impaired.
- the central metal of the metal chelate compound is not particularly limited, and various types of central metals such as aluminum, zirconium, and titanium can be used. Among these metal chelates, it is preferable to use an aluminum chelate having high reactivity.
- Examples of the aluminum chelating agent include complex compounds in which three ⁇ -ketoenolate anions are coordinated to aluminum, represented by the following general formula (2).
- R 1 , R 2 and R 3 are each independently an alkyl group or an alkoxyl group.
- the alkyl group include a methyl group and an ethyl group.
- the alkoxyl group include a methoxy group, an ethoxy group, and an oleyloxy group.
- the aluminum chelating agent represented by the general formula (2) include aluminum tris (acetylacetonate), aluminum tris (ethylacetoacetate), aluminum monoacetylacetonate bis (ethylacetoacetate), and aluminum monoacetylacetate.
- Aluminum tris (acetylacetonate) aluminum tris (ethylacetoacetate), aluminum monoacetylacetonate bis (ethylacetoacetate), and aluminum monoacetylacetate.
- the metal chelate compound is desirably used as a latent curing agent by impregnating the porous particles in an anisotropic conductive adhesive.
- a silane compound can be added as an auxiliary curing agent.
- the metal component that is a conductive component is made of powdered metal.
- gold, silver, copper, nickel, resin particles whose surface is metal-plated, or the like can be used.
- the anisotropic conductive adhesive may contain a heat conductive filler.
- the thermally conductive filler include solder, lead-free solder, zinc oxide, boron nitride, and aluminum oxide. Among them, lead-free solder is desirable from the viewpoint of heat dissipation and cost.
- the blending ratio (% by weight) of the epoxy-modified silicone resin and the metal chelate compound in the anisotropic conductive adhesive is preferably 100: 2 to 100: 10. Further, the blending ratio (volume%) of the epoxy-modified silicone resin and the metal component is preferably 100: 1 to 100: 30. On the other hand, the blending ratio (% by volume) of the epoxy-modified silicone resin and the heat conductive filler is preferably 100: 1 to 100: 30.
- a wiring board 51 (thickness 0.4 mm) made of ceramic on which an aluminum (Al) wiring layer is formed is disposed on a stage 55, and FIG. As shown, about 10 ⁇ g of anisotropic conductive adhesive 50 is disposed on the Al wiring layer of each wiring board 51, and the Al wiring layer of the wiring board 51 is brought into contact with the anisotropic conductive adhesive 50.
- FIG. 54 in the figure denotes conductive particles, which are resin particles whose surfaces are metal-plated here. The particle size of the conductive particles 54 is desirably 5 ⁇ m or more and 7 ⁇ m or less.
- Reference numeral 59 in the figure denotes a thermally conductive filler having a particle size of 3 ⁇ m or more and 10 ⁇ m or less. Here, lead-free solder particles are used.
- the stage 55 is provided with a heating device 56.
- a current is supplied from the power supply device 58 to the heating element 57 provided in the heating device 56, and the stage 55 is heated to a predetermined temperature in advance by the heat generated by the heating element 57.
- the wiring substrate 51 and the anisotropic conductive adhesive 50 on the wiring substrate 51 are heated from the heated stage 55 and heated.
- an LED element 52 (size: 0.65 mm ⁇ 0.65 mm, thickness 0.36 mm) is placed on the anisotropic conductive adhesive 50. Deploy.
- the phosphor layer 16 is disposed on one surface of the main body semiconductor chip 17, and the electrode 61 is provided on the opposite surface, and the electrode 61 is disposed in contact with the anisotropic conductive adhesive 50. .
- the phosphor layer 16 has a protective layer on the surface, and as shown in FIGS. 1 (d) and 2 (c), the pressurizing body 53 provided in the crimping device is connected to the LED element 52. The surface of the phosphor layer 16 is brought into contact.
- the pressure body 53 is temperature-controlled so as to maintain a temperature of about 20 ° C. to 40 ° C.
- the stage 55 has a wiring substrate 51 of 160 ° C. to 210 ° C., preferably 180 ° C. to 190 ° C.
- the temperature is controlled to be the following temperature.
- the anisotropic conductive adhesive 50 is pushed toward the outside of the wiring board 51 by the pressing force applied from the pressure body 53 to the LED element 52.
- the distance between the LED element 52 and the wiring board 51 is close, and the conductive particles located between the Al wiring layer of the wiring board 51 and the electrode 61 of the LED element 52 as shown in FIG. 54 is in contact with both the Al wiring layer of the wiring board 51 and the electrode 61, and the Al wiring layer of the wiring board 51 and the electrode 61 are electrically connected via the conductive particles 54.
- the anisotropic conductive adhesive 50 is primarily heated and heated by the heated wiring substrate 51, and the epoxy modification containing the metal chelate compound contained in the anisotropic conductive adhesive 50 by the temperature increase is included.
- the silicone resin diglycidyl isocyanuryl-modified polysiloxane
- the LED element 52 is bonded to the wiring substrate 51 by a compound obtained by the polymerization reaction.
- the phosphor layer 16 of the LED element 52 has a property of collapsing when heated to a temperature higher than 190 ° C.
- the pressure body 53 is higher than the wiring substrate 51 having an upper limit of 210 ° C. Since the temperature is low, the temperature at which the LED element 52 sandwiched between the wiring board 51 and the pressure body 53 is primarily heated is lower than the upper limit temperature 210 ° C. of the wiring board 51. .
- the pressing time for the pressing body 53 to press the LED element 52 is set to 20 seconds or less. 16 is prevented from collapsing.
- the pressure body 53 is separated from the LED element 52 as shown in FIG. In this state, the LED element 52 is bonded to the wiring board 51, and the LED element 52 and the wiring board 51 are temporarily connected so as not to move relatively.
- the wiring board 51 and the temporarily connected LED element 52 are transported in a temporarily connected state, are carried into a heating furnace, and the wiring board 51, the anisotropic conductive adhesive 50, and the LED element 52 are secondarily heated. .
- the temperature of secondary heating in the heating furnace is made lower than the temperature when primary heating is performed by the heating device 56 provided on the stage 55, and the heating time in the heating furnace is longer than the pressing time. Have been in time.
- the polymerization reaction of the epoxy-modified silicone resin with the metal chelate compound proceeds, and as a result, the anisotropic conductive adhesive 50 is cured and the LED element 52 is fixed to the wiring board 51.
- the light-emitting device 10 shown in FIG. 3F is obtained.
- the main body semiconductor chip 17 When the light emitting device 10 is energized, the main body semiconductor chip 17 emits light, and the emitted light is converted in wavelength when passing through the phosphor layer 16, and white light is emitted from the light emitting device 10. Note that the anisotropic conductive adhesive 50 of this example does not contain flux, and the light-emitting device 10 may not be cleaned.
- For conduction resistance measure the resistance value when a current of a predetermined value is passed through the sample, and “x” if the resistance value is judged not to be electrically connected. The measured resistance value is below the reference value. In some cases, “ ⁇ ” was designated, and “ ⁇ ” was designated when the resistance value was larger than the reference value although electrically connected.
- the force when removing the LED element 52 from the wiring board 51 is measured, and the case where the anisotropic conductive adhesive 50 is not sufficiently polymerized and the temporary connection is not made is “x”, and the temporary connection is made.
- the case was “ ⁇ ”, and the case where the force was temporarily removed but the removal force was smaller than the reference value was “ ⁇ ”.
- the item of “phosphor shape” is the result of observing the shape of the phosphor particles in the phosphor layer 16 after removing the pressurizing body 53 with a microscope.
- the body layer 16 is marked with “x”
- the phosphor layer 16 with small deformation is marked with “ ⁇ ”
- the deformation between “x” and “ ⁇ ” is marked with “ ⁇ ”.
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Abstract
Description
本発明に用いる異方導電性接着剤は、導電性ペーストからなるもので、バインダー樹脂であるエポキシ変性シリコーン系樹脂と、潜在性硬化剤である金属キレートと、導電成分である金属成分を含有する。この異方導電性接着剤は、フラックスを含まないものである。
先ず、図1(a)に示すように、アルミニウム(Al)配線層が形成されたセラミックから成る配線基板51(厚さ0.4mm)を、ステージ55上に配置し、図1(b)に示すように、各配線基板51のAl配線層上に、異方導電性接着剤50を約10μgそれぞれ配置し、配線基板51のAl配線層を異方導電性接着剤50と接触させる。その状態の断面図を、図2(a)に示す。図中の符号54は導電粒子であり、ここでは表面が金属メッキされた樹脂粒子である。導電粒子54の粒径は、5μm以上7μm以下が望ましい。また、図中の符号59は、熱伝導性フィラーであり、粒径は3μm以上10μm以下であり、ここでは無鉛半田の粒子が用いられている。
発光装置10を製造する工程において、一次加熱の際の配線基板51の温度と押圧加熱を変え、加圧体53によってLED素子52を押圧し、異方導電性接着剤50によってLED素子52を配線基板51に仮接続する際に、LED素子52の蛍光体層16側の表面温度と、配線基板51の表面温度とを測定した。LED素子52の蛍光体層16側の温度は加圧体53のLED素子52に接触する表面の温度と同じ値であるものとする。また、加熱炉で加熱せず、加圧体53を除去した後の配線基板51に電圧を印加し、LED素子52と配線基板51との間の導通抵抗値を測定した。測定結果を下記表1に示す。
50……異方導電性接着剤
51……配線基板
52……LED素子
53……加圧体
54……導電粒子
55……ステージ
56……加熱装置
57……発熱体
58……電源装置
59……熱導電性フィラー
61……電極
16……蛍光体層
17……本体半導体チップ
Claims (4)
- 配線基板上に配置され、重合成分と硬化剤とを含有する異方導電性接着剤上にLED素子を配置する配置工程と、
前記LED素子を所定の押圧時間、加圧体にて押圧しながら、前記異方導電性接着剤を昇温させ、前記重合成分の一部を前記硬化剤によって重合反応させ、前記LED素子を前記配線基板に仮接続する一次加熱工程と、
仮接続された前記配線基板と前記異方導電性接着剤と前記LED素子とを昇温させ、前記重合成分を重合反応させ、前記異方導電性接着剤を硬化させ、本接続させる二次加熱工程と、
を有する発光装置製造方法であって、
前記LED素子は蛍光体層を有しており、
前記重合成分にはエポキシ変性シリコーン系樹脂を含有させ、
前記硬化剤には、金属キレート化合物を用い、
前記一次加熱工程では、前記配線基板を160℃以上210℃以下の温度で所定の押圧時間押圧する発光装置製造方法。 - 前記押圧時間は、60秒以下の時間にする請求項1記載の発光装置製造方法。
- 前記二次加熱工程での前記配線基板の温度は、前記一次加熱工程での前記配線基板の温度よりも低くし、
前記二次加熱工程での前記配線基板を加熱する加熱時間は、前記押圧時間よりも長くする請求項1又は請求項2のいずれか1項記載の発光装置製造方法。 - 前記加圧体には、20℃以上40℃以下の温度を維持させる請求項1乃至請求項3のいずれか1項記載の発光装置製造方法。
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US15/550,544 US10626301B2 (en) | 2015-03-18 | 2016-03-10 | Method for manufacturing light emitting device |
CN201680013081.6A CN107408616A (zh) | 2015-03-18 | 2016-03-10 | 发光装置制造方法 |
EP16764834.4A EP3273493B1 (en) | 2015-03-18 | 2016-03-10 | Method for manufacturing light emitting device |
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JP6565902B2 (ja) | 2019-08-28 |
EP3273493A1 (en) | 2018-01-24 |
US20180037773A1 (en) | 2018-02-08 |
TW201705540A (zh) | 2017-02-01 |
TWI700841B (zh) | 2020-08-01 |
KR101985733B1 (ko) | 2019-06-04 |
EP3273493B1 (en) | 2022-03-02 |
KR20170103897A (ko) | 2017-09-13 |
CN107408616A (zh) | 2017-11-28 |
EP3273493A4 (en) | 2018-10-10 |
US10626301B2 (en) | 2020-04-21 |
JPWO2016148004A1 (ja) | 2017-12-28 |
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