JP6107559B2 - 発光装置 - Google Patents
発光装置 Download PDFInfo
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- JP6107559B2 JP6107559B2 JP2013191606A JP2013191606A JP6107559B2 JP 6107559 B2 JP6107559 B2 JP 6107559B2 JP 2013191606 A JP2013191606 A JP 2013191606A JP 2013191606 A JP2013191606 A JP 2013191606A JP 6107559 B2 JP6107559 B2 JP 6107559B2
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- Prior art keywords
- stabilizer
- case
- light
- emitting device
- led chip
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- 239000003381 stabilizer Substances 0.000 claims description 49
- 239000003566 sealing material Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 28
- 238000002844 melting Methods 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 3
- OYNOCRWQLLIRON-UHFFFAOYSA-N 1-n,3-n-bis(2,2,6,6-tetramethylpiperidin-4-yl)benzene-1,3-dicarboxamide Chemical group C1C(C)(C)NC(C)(C)CC1NC(=O)C1=CC=CC(C(=O)NC2CC(C)(C)NC(C)(C)C2)=C1 OYNOCRWQLLIRON-UHFFFAOYSA-N 0.000 claims description 2
- -1 3,5-di-t-butyl-4-hydroxybenzyl Chemical group 0.000 claims description 2
- 238000004020 luminiscence type Methods 0.000 claims 1
- 229920001123 polycyclohexylenedimethylene terephthalate Polymers 0.000 description 15
- 238000002845 discoloration Methods 0.000 description 12
- 229920001296 polysiloxane Polymers 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- 239000000945 filler Substances 0.000 description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000004954 Polyphthalamide Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920006375 polyphtalamide Polymers 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000012779 reinforcing material Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 2
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 2
- 239000008393 encapsulating agent Substances 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000004611 light stabiliser Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- VNQNXQYZMPJLQX-UHFFFAOYSA-N 1,3,5-tris[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-1,3,5-triazinane-2,4,6-trione Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CN2C(N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C(=O)N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C2=O)=O)=C1 VNQNXQYZMPJLQX-UHFFFAOYSA-N 0.000 description 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000004953 Aliphatic polyamide Substances 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229920003231 aliphatic polyamide Polymers 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012802 nanoclay Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920006119 nylon 10T Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 125000003386 piperidinyl group Chemical group 0.000 description 1
- 229920006111 poly(hexamethylene terephthalamide) Polymers 0.000 description 1
- 229920006128 poly(nonamethylene terephthalamide) Polymers 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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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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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/673—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders
- H01L21/6735—Closed carriers
- H01L21/67376—Closed carriers characterised by sealing arrangements
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- 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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
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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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48257—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a die pad of the item
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- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
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- 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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- H01L2924/183—Connection portion, e.g. seal
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- H01L31/02—Details
- H01L31/0203—Containers; Encapsulations, e.g. encapsulation of photodiodes
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- 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
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Led Device Packages (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
1−1.安定剤の存在の態様
安定剤をケースの内壁面と封止材との界面又は該界面から300μm以内に存在させた態様としては、特に限定されないが、次のものを例示できる。
(a)安定剤をケースに含ませることにより前記界面に存在させた態様。この場合、安定剤の添加量は、ケース材量の0.1〜3質量%が好ましい。
(b)安定剤を封止材に含ませることにより前記界面に存在させた態様。この場合、安定剤の添加量は、封止材量の0.1〜3質量%が好ましい。
(c)安定剤をLEDチップ実装用のダイボンド材に含ませることにより前記界面から300μm以内に存在させた態様。この場合、安定剤の添加量は、ダイボンド材量の0.1〜20質量%が好ましく、1〜10質量%がより好ましい。
(d)安定剤をケースの内壁面に付着させることにより前記界面に存在させた態様。この場合、安定剤の添加量は、封止材量の0.1〜3質量%が好ましい。
LEDチップのジャンクション温度にもよるが、ジャンクション温度よりも80℃以上高く、且つ、272℃を超えない融点を有する好ましい安定剤として、次のものを例示できる。
(1)立体障害性アミン光安定剤(HALS化合物)の群から選択される化合物とカルボン酸またはカルボン酸誘導体との塩様反応生成物
・ナイロスタブS−EED(クラリアント・ジャパン社製、登録商標) 融点272℃
その成分はN,N'−ビス(2,2,6,6−テトラメチル−4−ピペリジニル)−1,3−ベンゾールジカルボキサミドである。
・ホスタビンN20(クラリアント・ジャパン社製、登録商標) 融点225℃
・ホスタビンN845PP(クラリアント・ジャパン社製、登録商標) 融点28℃
・ホスタビンNOW(クラリアント・ジャパン社製、登録商標) 融点−
・ホスタビンN24(クラリアント・ジャパン社製、登録商標) 融点16℃
・ホスタビンN30(クラリアント・ジャパン社製、登録商標) 融点148℃
・ホスタビンN321(クラリアント・ジャパン社製、登録商標) 融点58〜70℃
・ホスタビンPR−31(クラリアント・ジャパン社製、登録商標) 融点120〜125℃
(2)ヒンダードフェノール系酸化防止剤
・イルガノックス3114(BASF社製、登録商標) 融点218℃
その成分はトリス−(3,5−ジ−t−ブチル−4−ヒドロキシベンジル)−イソシアヌレイトである。
安定剤の添加量としては、0.1質量%〜20質量%が好ましい。
発光装置(LEDパッケージ)のタイプとしては、特に限定されないが、SMD(Surface Mount Device、基板表面実装型デバイス)、COB(Chip on Board、チップ・オン・ボード)タイプ等を例示でき、各種パッケージに適用できる。SMDとしては、トップビュータイプ、サイドビュータイプ等を例示できる。使用するLEDチップとしては、フェイスアップタイプ、フリップチップタイプ等を例示できる。
LEDチップのジャンクション温度(Tj)は、LEDチップの温度(厳密にはPN接合部の温度)であり、直接的に測定することもできるし、LEDチップ近傍の測定温度から公知の経験則に基づいて推定することもできる。
3−1.ケースの主材料
ケースの材料としては、前述のとおりPCT(Polycyclohexylene Dimethylene Terephthalate:ポリシクロヘキシレン・ジメチレン・テレフタレート)を使用する。但し、PCTを主成分(質量%で一番配合比が高い成分。好ましくは50質量%以上。)とし、これにその他の熱可塑性樹脂又は熱硬化性樹脂を配合してもよい。配合する熱可塑性樹脂としては、PA6T、PA9T、PA10Tなどの芳香族ポリアミド樹脂や、脂環族ポリアミド樹脂、脂肪族ポリアミド樹脂、液晶ポリマー等を例示でき、これらのうちでは耐熱変色の点から脂環族ポリアミド樹脂が好ましい。配合する熱硬化性樹脂としては、シリコーンおよび変性シリコーン樹脂、エポキシおよび変性エポキシ樹脂を例示できる。
添加剤の例として、反射材、光安定剤(さらなるHALS化合物、UV吸収剤、励起状態消光剤)、リン系または硫黄系の加工安定剤、酸化防止剤(フェノール系またはアミン系)、帯電防止剤、核剤、透明剤、難燃剤、補強材(例えば、鉱物系フィラー、ガラス繊維、中空ガラス球、カーボンファイバー、ナノスケールの補強材(例えば、ナノクレイ、カーボンナノチューブ)、滑剤、抗ブロッキング剤、着色剤(顔料および着色剤)等が挙げられる。反射材としては、直径が約0.1μm以上0.3μm以下の略球形状であり、ケース樹脂組成物中の含有量が約10重量%以上50重量%以下が好ましい。酸化チタンが好適に用いられる。酸化亜鉛、酸化ジルコニウム、硫酸バリウム、硫化亜鉛、窒化ホウ素を使用することもできる。
封止材は、リードフレームのAgめっきの腐食を抑制するため、ガスバリヤ性に優れる方が好ましい。エポキシ、変性シリコーン、フェニルシリコーン、ジメチルシリコーン、シルセスキオキサン含有シリコーンなどを用いることができる。中でも、変性シリコーン、フェニルシリコーンが、熱、光による黄変が少なく、ガスバリヤ性に優れることから好ましい。
LEDチップを実装する相手部材としては、特に限定されないが、リードフレーム、プリント配線基板の配線パターン等を例示できる。同部材を通じて、LEDチップの熱はケース及び封止材に伝わる。
さらに、(c)を具体化し、ダイボンド材4にNo.7の安定剤をダイボンド材量に対して6質量%含ませる態様を試験した結果を、表1の試験結果3に示す。この試験結果3は、パッケージ連続通電試験500時間での光度維持率(%)について、どこにも安定剤を配合しなかった場合の光度維持率をリファレンス(×評価)とし、同リファレンスよりも高い光度維持率が得られた場合を○と評価したものである。
(1)LEDチップ2のジャンクション温度(Tj)130℃よりも80℃以上高い融点を有する安定剤(No.6とNo.7)が、高い光度維持率を示し、良いこと。
(2)特にヒンダードアミン系の安定剤(No.7)が、高い光度維持率を示し、良いこと。ピペリジン構造が好ましいと考えられる。
(3)粉体で測定した反射率は、青色光(450nm)の反射率は高い方が良く、紫外光(400nm)の反射率は低いほうが良いこと。
2 LEDチップ
3 リードフレーム
4 ダイボンド材
5 ケース
6 封止材
7 ボンディングワイヤ
11 底部
12 長辺壁
13 短辺壁
Claims (7)
- LEDチップと、ポリシクロヘキシレン・ジメチレン・テレフタレートよりなるケースと、ケースの内部に充填されてLEDチップを封止した封止材とを備え、LEDチップのジャンクション温度よりも80℃以上高く、且つ、272℃を超えない融点を有する安定剤を、ケースの内壁面と封止材との界面又は該界面から300μm以内に存在させたことを特徴とする発光装置。
- 安定剤をケースに含ませることにより前記界面に存在させた請求項1記載の発光装置。
- 安定剤を封止材に含ませることにより前記界面に存在させた請求項1記載の発光装置。
- 安定剤をLEDチップ実装用のダイボンド材に含ませることにより前記界面から300μm以内に存在させた請求項1記載の発光装置。
- 安定剤をケースの内壁面に付着させることにより前記界面に存在させた請求項1記載の発光装置。
- 安定剤は、N,N'−ビス(2,2,6,6−テトラメチル−4−ピペリジニル)−1,3−ベンゾールジカルボキサミドである請求項1〜5のいずれか一項に記載の発光装置。
- 安定剤は、トリス−(3,5−ジ−t−ブチル−4−ヒドロキシベンジル)−イソシアヌレイトである請求項1〜5のいずれか一項に記載の発光装置。
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