TWI298955B - Light transforming structure and light emitting device using the same - Google Patents
Light transforming structure and light emitting device using the same Download PDFInfo
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- TWI298955B TWI298955B TW094144735A TW94144735A TWI298955B TW I298955 B TWI298955 B TW I298955B TW 094144735 A TW094144735 A TW 094144735A TW 94144735 A TW94144735 A TW 94144735A TW I298955 B TWI298955 B TW I298955B
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- Prior art keywords
- light
- phase
- layer
- metal oxide
- color tone
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- 230000001131 transforming effect Effects 0.000 title 1
- 239000002131 composite material Substances 0.000 claims description 43
- 239000000919 ceramic Substances 0.000 claims description 38
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 32
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 229910044991 metal oxide Inorganic materials 0.000 claims description 27
- 150000004706 metal oxides Chemical class 0.000 claims description 27
- 238000007711 solidification Methods 0.000 claims description 12
- 230000008023 solidification Effects 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 6
- 229910052707 ruthenium Inorganic materials 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims 1
- 239000000843 powder Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 238000001228 spectrum Methods 0.000 description 9
- 230000006866 deterioration Effects 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 230000005284 excitation Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- -1 Pr6On Inorganic materials 0.000 description 3
- 229910000420 cerium oxide Inorganic materials 0.000 description 3
- 210000003298 dental enamel Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- RGCKGOZRHPZPFP-UHFFFAOYSA-N alizarin Chemical compound C1=CC=C2C(=O)C3=C(O)C(O)=CC=C3C(=O)C2=C1 RGCKGOZRHPZPFP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004313 glare Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000001748 luminescence spectrum Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 206010036790 Productive cough Diseases 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- AZHSSKPUVBVXLK-UHFFFAOYSA-N ethane-1,1-diol Chemical compound CC(O)O AZHSSKPUVBVXLK-UHFFFAOYSA-N 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000006166 lysate Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 210000003802 sputum Anatomy 0.000 description 1
- 208000024794 sputum Diseases 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000597 tin-copper alloy Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/7792—Aluminates
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Description
1298955 九、發明說明: 【發明所屬^技術領域3 關聯申請案之說明 本申請案係主張以2〇〇4年12月17日提出之日本特許出 5 願2004-365589號為基礎之優先權的申請案,且前述基礎申 請案之内容在此加入作為參考。 技術領域 本發明係有關一種光轉換結構體及利用其之高亮度發 光裝置,且前述光轉換結構體係可將照射光之一部份轉換 10 成波長與照射光不同之光,並且混合未轉換之照射光,而 將其轉換成色調與照射光不同之光者。 技術背景 近年,受到藍色、紫外發光二極體之實用化的影響, 15 將前述二極體作為發光源之白色發光二極體的開發研究正 熱烈展開。由於白色發光二極體量輕、不使用水銀、壽命 長,因此今後需求之急速擴大係可預測的。通常白色光發 光二極體係採用於藍色發光元件上塗布以鈽活化之 YAG(Y3A15012 : Ce)粉末與環氧樹脂之混合物塗料者。(特 20 開 2000-208815 號公報) 然而,以鈽活化之YAG(Y3A15012·· Ce)粉末與環氧樹脂 之混合物無法製得高亮度之發光裝置。這是因為螢光體粉 末表面之缺陷會吸收光的緣故,特別地,在環氧樹脂中分 散有螢光體之層内,每當光碰到螢光體粉末表面時便會散 5 1298955 射,且反覆進行複雜的反射、穿透,因此增強了前述效果。 又,由於螢光體之折射率大於樹脂,每當光透射螢光體時, ' 會引起螢光體内部之全反射,因此增加了光的吸收。故, 無法利用於樹脂上分散有螢光體之白色發光二極體製得高 5 亮度之發光二極體。 一 再者,YAG : Ce之勞光色在CIE色度座標上,χ=0.41、 y=0.5附近,當與460nm之藍色激發光混色時,由於是在連 g 接藍色發光二極體之色座標與YAG : Ce之色座標之線上控 制色調,顏色不是呈白色而是呈混合青綠色之白色,因此, 10 產生只能實現紅色不足之白色的問題。為了解決前述色調 之缺點,可在YAG : Ce之螢光體粉末中混合可發出紅色之 螢光體粉末,再將其混合於樹脂中塗布,以藉此調整色調。 因此,目前廣泛地使用的是當控制發光二極體之色調時, 藉由混合第二螢光粉,再混合於樹脂中並將其塗布於發光 15元件,以實現在一個螢光體中無法進行之色調調整的方法。 鲁如前所述,習知之發光二極體無法藉由變化色調之白 、 色發光體得到充足地高亮度。又,由於在接近光源之各處 . 使用樹脂等有機物,因此具有容易惡化之問題。 本發明係為了解決前述問題點而作成者,本發明係有 • 20關一種使用於藉轉換發光元件之光而得到目的之光之發光 H光轉換結構體。又,本發明之目的在於提供—種 透光性佳、高亮度、惡化問題少、並可控制成理想色調的 光轉換結構體。又,本發明之目的在於提供一種利用該等 光轉換結構體之發光二極體等的發光裝置。 6 1298955 C發明内容:j 發明概要 本發明人係著眼於具有透光性佳且惡化問題少等優異 特性,且由連續且立體地相互纏繞至少兩個以上金屬氧化 5物相而形成之凝固體所組成之光轉換材料,並針對可一面 保持該等特性一面調整色調之方法進行專一檢討之後,而 完成發明本發明之光轉換結構體。 即’本發明係有關一種光轉換結構體,包含有:由陶 瓷複合體構成之層,係可吸收第一光之一部份而發出第二 10光,並且可透過前述第一光之一部份者;及色調控制用螢 光體層,係形成於前述陶瓷複合體之表面,且可吸收前述 第一光之一部份或第二光之一部份而發出第三光,並且可 透過前述第一光之一部份或第二光之一部份者。又,前述 陶瓷複合體係由連續且立體地相互纏繞至少兩個以上金屬 15 氧化物相而形成之凝固體所構成,而至少一個前述凝固體 中之金屬氧化物相含有可發出螢光之金屬元素氧化物。 又’本發明係有關一種光轉換結構體,其中前述凝固 體係由α-Α12〇3相與以鈽活化之Y3Al5〇12(YAG)相之兩個金 屬氧化物相所組成。 20 又,本發明係有關一種光轉換結構體,其中前述凝固 體係由α-Α12〇3相與以铽活化之Y3Al5〇12(YAG)相之兩個金 屬氧化物相所組成。 又,本發明係有關一種光轉換結構體,其中前述第一 光係於200〜500nm具有尖峰之光,且前述第二光係於 1298955 發明之發光裝置係由可發出可成為激發源之光的發光一 件、及設置成可接受前述光之本發明之光轉換結構體2 成。發光元件可使用如發光二極體、雷射振盪 構 千、水銀 燈等。在此,當使用發光二極體元件作為發光元件時、 5發明之發光裝置特別地可稱為發光二極體。 本 在第1圖之發光裝置中,於金屬製之支持台丨上固~ • 發光元件2,而元件上之電極藉導電性導線4與支持有 _ 極3連接。又,在支持台之上側裝載有用於本發明之 W合體5,而於前述陶竟複合體之表面形成有色調控制用營光 〇體層6。又,藉由陶瓷複合體5,從發光元件2發出之第一光 (立例如藍色光)之-部份轉換成第二光(例如黃色光),且另一 P伤直接牙透並經混合後射出。再者,從陶瓷複合體5發出 之第-光與第二光係進入色調控制用營光體層6。在此,色 b調控制用螢光體層係可吸收包含於白色光(例如黃色或藍 15色光)之-部份.,且可添加新的第三色(例如紅色光)者。因 _ 此,混合該等色光而形成之整體光(例如暖色系的白色)可從 本^明之光轉換結構體發出,並可控制發光色。 • 树明之光轉換結構體之結構包含有可吸收第-光之 4伤而發出第二光,並且可透過前述第—光之—部份之 由陶莞複合體構成之層;及形成於前述陶究複合體之表 面:且可吸收前述第-光之一部份或第二光之一部份而發 立出第三光,並騎透過前述第_光之—部份或第二光之一 择之色调控制用螢光體層。又,前述陶兗複合體係由連 貝且立體地相互纏繞至少兩個以上金屬氧化物相而形成之 9 1298955 凝固體所構成,而至少一 含有:發出螢光之金屬元素氧化物固體中之金屬氧化物相 5 10 15 兩個以用由連續且立體地相,至少 孟屬氧化物相而形成之凝固體 轉換之光、未經轉換之光透射率高 1業經 得到^佳、惡化問題少之發光二極體= =㈣峨係含材爾述第—光之、。 Γ 光之—部份而❹第三光之螢规,並且且有^ =第一光之-部份或第二光之-部份之相的層有: 由於河述陶餘合體之表面設置可吸收前述第—光之 光之-部份或第二光之二:t穿透前述第- 之邛伤之色調控制用螢光體層,而 可輕易控制色調。 ^ 發光二極體元件可使用市售之發光二極體树。又, 本發明之光源並*限定於發光二極體,即使使用如紫外 燈、雷射等之光源亦可得到相同效果。光源之波長可採用 务外至監色之波長。特別地,當使用200〜500nm之波長時, 可提咼陶瓷複合體之發光強度’因此本發明最好係使用 200〜500nm之波長。 以導線接合器之作業上的觀點而言,導電性導線最好 係使用ΙΟμιη至45μηι者,而材質可使用如金、銅、銘、翻等 及該等合金。又,黏著於支持台之光轉換用陶瓷複合體之 側面的電極係如鐵、鋼、金、鐵銅合金、錫銅合金或鍍銀 鋁、鍍銀鐵、鍍銀銅等之電極。 20 1298955 構成本發明之光轉換結構體之陶瓷複合體係由連續且 立體地相互纏繞至少兩個以上金屬氧化物相而形成之凝固 體所構成,且至少一個前述凝固體中之金屬氧化物相含有 可發出螢光之金屬元素氧化物。又,構成凝固體之金屬氧 5 化物相最好係選自於單一金屬氧化物及複合金屬氧化物。 所謂的單一金屬氧化物即是一種類之金屬氧化物,而 所謂的複合金屬氧化物即是兩種以上之金屬氧化物。該等 氧化物係分別具有立體地相互纏繞之結構。該單一金屬氧 化物係如:氧化鋁(Al2〇3)、氧化锆(Zr02)、氧化鎂(MgO)、 10 氧化矽(Si02)、氧化鈦(Ti02)、氧化鋇(BaO)、氧化鈹(BeO)、 氧化鈣(CaO)、氧化鉻(Cr203)等、及其他烯土元素氧化 (La203、Y203、Ce02、Pr6On、Nd203、Sm203、Gd203、Eu2〇3、 Tb407、Dy203、Ho203、Er203、Tm203、Yb203、Lu203)等。 又,複合金屬氧化物係如:LaA103、CeA103、PrA103、 15 NdA103、SmA103、EuA103、GdA103、DyA103、ErA103、 Yb4Al209、Y3Al5〇12、Er3Al5012、Tb3Al5012、11A1203 · La203、 llAl203.Nd203、3Dy203.5Al203、2Dy203.Al203、llAl203· Pr203、EuAlu〇18、2Gd2〇3 · A1203、11A1203 · Sm203、 Yb3Al5012、CeAlu〇18、Er4Al209等。 20 當構成白色發光二極體時,陶瓷複合體最好係組合
Al2〇3結晶與作為以烯土類元素活化之複合金屬氧化物之 石瘤型結晶單晶。前述光轉換元件可吸收構成可發出可見 光且以InGaN為代表之氮化物半導體層的一部份發出光,因 此可製得效率佳之白色發光二極體。又,石榴型結晶之結 11 1298955 構式為ΑΑβ!2,而結構式中的a係選自於Y、Tb、Sm、Gd、 La、Er之群之一種以上之元素,又,相同結構式中的χ最好 係包含有選自於Al、Ga之一種以上之元素。由該等理想地 組合構成之光轉化材料最好係可一面穿透紫外至藍色之 5 光,一面吸收前述光之一部份,並且與以可發出黃色螢光 之Ce活化之Υ3Α15〇12組合。其原因係因為Y3A15012(YAG)藉 由於200〜500nm具有尖峰之激發光而可發出510〜650nm之
黃色強光。又,即使與以Tb活化之γ3Α15012配合,由於在 前述激發波長範圍中可發出綠色強光,故適用於此。 構成本發明之光轉換結構體的陶瓷複合體係在溶解原 料金屬氧化物之後,再凝固而成者。例如,利用將溶解物 裝入保持於一定溫度之坩堝,並且一面控制冷卻溫度一面 冷卻凝結之簡單地方法,而可製得凝固物,但最好係利用 定向凝固法製得凝固物。本發明之陶莞複合材料係考慮各 15種結晶相之組合,但本發明之實施形態的說明係舉出為在 可構成白色發光二極體方面最重要地組成系之
Ai2〇3/YACi : Ce系作說明 a衣狂<概要如下v 20 首先’以所要之成分比率之比例混合鳴〇3與祕、 Ce〇2,以調整混合粉末。最佳地組合比例係當只有α_執 與砂時,莫耳比為82 :丨8。並從騎料⑽2時最後產 生之YAG之Ce的取代量倒算,以求得Μ、Υ办、㈤ 之成分比率。對於混合方法並無_地限制,皆可使用乾2 式混合法及濕式混合法。接菩,脸 I將眾所皆知之溶解爐,例 如電弧爐,加熱至可溶解進料比的温度,以溶解前述混合 12 1298955 粉末。例如,當溶解Al2〇3與Υ2〇3時,則將加熱爐加熱至 1900〜2000〇C。 接耆,將製得之溶解物直接裝入掛禍,使其凝固於定 向,或者,在一次凝固之後粉碎前述凝固物,再將前述粉 5碎物裝入坩堝,經過再度加熱、溶解之後,將裝有溶液之 坩堝從溶解爐之加熱區拉出,再進行定向凝固。雖然亦可 在常壓下進行溶液之定向凝固,但最好在4〇〇〇pa以下之壓 力下進行定向凝固,以製得結晶相缺陷少之材料,其中又 以在0.13Pa(10_3Torr)以下為更佳。 10 ㈣禍加熱區拉出之速度’即,溶液之凝結速度係依 溶液結構及溶解條件而設定於適當的值,通常為5〇醜/時 間以下,又以1〜20mm/時間為佳。 15
20 可於定向產生凝固之裝置係於設置於垂直方向之圓筒 狀容器内收納㈣禍’而前述掛顯可上下移動者。又, 在圓筒狀容器之巾央料㈣裝有加_之錢線圈,並 設置有心X減少容器内空間動之真空泵,而前述襄置本 身可使用眾所皆知之裝置者。 可構成本發明之光轉換用陶竞複合體之至少一個相之 螢光體係可藉於金屬氧化物或複合氧化物添加活化元素製 得。使用於本發明之光轉換用料次合體之喊複合材料 係將至少-個構成相作為f光體相,基本上,係可盘本申 請案申請者(發日_人)先於特開平7·胸7號公報、特開 平7-187893號公報、特開平8-8防7號公報、特開平8_253389 號公報、特開平8·253390號公報及特開平9侧4號公報及 13 1298955 如,當添加紅色時,無機系之螢光體係可使用眾所皆知之 螢光體’例如 ’ Journal of Physics and Chemistry of Solids 61(2000) 2001-2006頁所揭示之以Eu活化之Ba2Si5N8,或, 特開2003-27746號公報所揭示之以Eu活化之Ca2Si5N8(Ca、 5 SrhSisN8、第65屆應用物理學會學術演講會演講草稿集 1283頁所揭示之以Ειι活化之CaAlSiN3等之螢光體等。由於 該等螢光體係對於300〜500nm之激發光可得到550〜700nm _ 之紅色強光,因此當與陶瓷複合材料配合使用時,可藉由 使用放出有作為第一光之光得到含有紅色之白色。又,亦 10可使用有機系之色素,例如使用螢光。因此,可利用從陶 瓷複合材料放出之光的一部份而添加紅色於白色,故可得 到暖色系的白色。又,藍色之螢光體係可利用含有仙之
BaMgAl10〇17(BAM : Eu)等。 鈾述色調控制用螢光體層最好係於石夕樹脂上分散有選 15 自於由CaAlSiN3 : Eu、BaMgAl1()017 : Eu、及Ca2Si5N8 : Eu I 所構成之群之至少一種之螢光體的層。於矽樹脂上分散有 該等螢光體之層係可適當地發出紅色光,並且可有效率地 透過無法吸收之光,故可控制成理想地顏色,且可提供高 亮度之發光二極體。 2〇 色調控制用螢光體層之其他形態係如由連續且立體地 才互、、廛、、%至少兩個以上金屬氧化物相而形成之凝固體所組 成,而至少一個前述凝固體中之金屬氧化物相含有可發出 榮光之金屬元素氧化物。具體而言,前述色調控制用费光 層最好係由連續且立體地相互纏繞Y3A15〇i2(yag)相與添 15 U98955 由、查=之α·Αΐ2〇3相而形成之凝固體所組成的層。藉由使用 &Α α且立體地4目互纏繞Υ3Αΐ5〇12(ΥΑ(})相與添加有Cr之 12〇3相而形成之凝固體,而可控制成理想地顏色,並可 的==化問題'耐熱性高、光混色性佳、且高亮度 又
厚声口由於色調控制用螢光體層係用於改變色調,故其 &可在*具有如構成本發明之喊複合體的厚度之情況 色性H ^複合體特徵之高亮度、惡化問題少、光混 色性佳等之優異特徵。 有c ^由連績且立體地相互纏繞lA^OyYAG)相與添加 3相而形成之凝固體所組成的層係可以盘 陶瓷禎人駚η据 〇引逆 之屑口 _ "羨之方法製造。於由前述陶瓷複合體所組成 运之表面$成由該等凝固體所組成之色調控制用榮光體 15層之方法並不特別限定於以單純重疊而固定之方法、或以 =光1±之黏著軸接之方法。又,所謂的於由前述陶究複 合體所組成之層之表面形成由該等凝固體所組成之色調控 J用k光體;|並不是限定於由前述陶t複合體所組成之層 之表面另外接著形成其他之層等,亦可呈緊密地連接前述 二層之狀態。 20實施例 以下’舉出具體之例加以詳細說明本發明。 (實施例1) 使用α-Α12〇3粉末(純度99·99%)0·8136莫耳、Υ2〇3粉末 (99·999°/〇)0·1756莫耳、Ce〇2粉末(純度 99·"%)〇·〇ι〇9作為原 16 1298955 料。將該等粉末藉球磨機濕式混合在乙_精巾i6個小時 之後,再使用蒸發器脫媒乙醇酒精,以製得原料粉末。又, 原料粉末可作為在真空爐中預備溶解且定向凝固之原料。 接著,直接將前述原料裝進鉬坩堝,並安裝定向凝固 5裝置,以L33X 1(r3pa(10_5T沉0之壓力下溶解原料。接著, 在同-環境氣體中,以5mm/時間之速度下降掛碼製得凝固 體。而前述製得之凝固體係呈黃色。經電子顯微鏡觀察之 結果可得知前述凝固體不具有群體或晶粒界相,並且具有 不存有氣泡4空隙之均等組織。冑然在禱塊中觀測到 10 CeAlu018,但存量非常少。 又,從本光轉換用陶瓷複合材料之凝固體中琢出直徑 1.5mm、厚度〇.lmm之小圓盤狀片。接著,藉由銀塗料將 460nm之發光元件黏著於具有電極之陶瓷封裝體,且以使用 導線接合器之導電性導線連接支持台之電極與形成於發光 15元件表面之電極,並連接已製作之陶瓷複合體與封裝體, • 而製得無色調控制用螢光體層之發光二極體。第2圖係顯示 從無色調控制用螢光體層之陶瓷複合體所得到之光譜圖。 此時之色座標為χ=〇·31、γ=0·34,呈稍含有藍色之白色。又, 測定係使用Ocean 〇ptics公司之積分球F〇IS-1,而分光鏡係 20使用同公司之USB2_。又,積分球與分光鏡係利用光纖 結合。又,前述測定系統係使用见8丁標準之鎢鹵素標準光 源進行校正。 接著,準備作為紅色螢光體之CaAlSiN3 : Ειι。製作方 法係以窒素環境氣體秤量Ca3N2、結晶質Si3N4、AiN、EuN, 17 1298955 再混合在窒素環境氣體中。接著,將製得之混合粉末裝入 BN製之购中,且於·t窒素環境氣體中保持$小時後 製成又’藉由X線折射識別之製得粉末之結果為 CaAlSiN3,並且當照射紫外線及藍色光時,可觀察到刖a 5之紅色螢光。接著,將前述紅色系螢光體分散於矽樹脂上, 作成油墨。再藉由旋轉塗膜機將前述油墨均等地塗布於前 述發光二極體之光轉換用陶瓷複合材料的表面。以前述製 作方法製作之發光二極體之發光光譜如第3圖所示,藉該圖 可得知650nm附近之紅色光譜增加了。又,此時之色座標為 10 X 0·40 ' y—〇·39 ’且前述座標從藍色發光二極體與yag :
Ce之色座;f示軌跡上偏離,並位於紅色側,故可得知本發明 可有效地控制色調。又,前述白色係強調紅色,且色調為 暖色系之白色發光二極體。 // (實施例2) 15 從貫施例1之光轉換用陶瓷複合材料之凝固體作成直 徑5mm、厚度0.2mm之圓盤狀顆粒。當前述顆粒一照射紫 外光(365nm)之光就會發出黃色強光。接著,使用含有可吸 收紫外光(365nm)而放出藍色光之此之 BaMgAhoOWBAM : Eu)製作與實施例丨相同之塗料,並藉 2〇由旋轉塗膜機於光轉換材料上形成均等地膜。接著,從1 述光轉換結構體之陶瓷複合體面照射紫外光(365nm),並測 定從BAM:Eu之塗布面放出之光譜,其結果如第4圖所示。 又,通過光轉換用陶瓷複合材料之紫外光的一部份藉 BAM: Eu轉換成藍色,且利用和從光轉換用陶瓷複合材料 • 1298955 - I生之黃色發光加在—起而可得到白色光。此時之色座標 為X 0.29、y-0.33。故,藉由使用紫外光組合登光體 與光轉換材料,可控制光轉換用陶究複合材料之色調,並 可得到理想地白色光。 5 (實施例3) 係、以”實知例1相同,但添加物從Ce轉換成之方法製 、 #光轉換用陶甍複合材料,並製作與實施例2相同形狀之顆 φ 粒。荊述光轉換結構體藉紫外光(365nm)激發時之發光光譜 如第5圖所示。藉該圖可確認前述光轉換結構體受紫外光發 出有綠色光。接著,以與實施例丨相同之方法,於前述顆粒 之其中一表面製作在實施例1中製成之紅色螢光體膜。接 - 著’從前述光轉換結構體之陶瓷複合體面照射紫外光 ' (365nm),並測定從紅色螢光體之塗布面放出之光譜。其結 果如第6圖所示,此時之色座標為χ=〇·42、y=〇 39,並可得 到暖色系的白色光。故,藉由使用紫外光組合光轉換材料 • 與紅色螢光體’可控制光轉換用陶瓷複合材料之色調,並 ' 可得到暖色系的白色光。 - 產業上利用之可能性 - 根據本發明,可提供一種透光性佳、高亮度、惡化問 2 0 日 題少、並可控制色調之發光裝置。特別地,藉由使用由凝 固體與可發出紅色光之色調控制用螢光體層所組成之光轉 換用結構體,可製得高亮度、惡化問題少之暖色系白色, 而前述凝固體係由α_Αΐ2〇3相與以鈽活化之Y3Al5〇i2(YAG) • 相之兩個金屬氧化物相所組成。又,藉由使用由凝固體與 19 1298955 可發出藍色光之色調控制用螢光體層所組成之光轉換用結 構體,可製得高亮度、惡化問題少之白色,而前述凝固體 係由α-Α12〇3相與以釗ί活化之Y3Al5〇i2(YAG)相之兩個金屬 氧化物相所組成。又,藉由使用由凝固體與可發出紅色光 5 之色調控制用螢光體層所組成之光轉換用結構體,可製得 高亮度、惡化問題少之暖色系的白色。故可明白本發明有 用於產業上。 【圖式簡單說明】 B 第1圖係顯示本發明之光轉換結構體及發光裝置之一 10 實施形態之截面圖。 第2圖係藉實施例1之陶瓷複合體所得到之光譜圖。 第3圖係藉實施例1所得到之發光二極體之光譜圖。 第4圖係藉實施例2所得到之發光二極體之光譜圖。 第5圖係藉實施例3之陶瓷複合體所得到之光譜圖。 15 第6圖係藉實施例3所得到之發光二極體之光譜圖。 【主要元件符號說明】 5.. .陶瓷複合體 6.. .色調控制用螢光體層 • 1…支持台 2…發光元件 3.. .支持台之電極 4.. .導電性導線 20
Claims (1)
- 第941侧號專利申請案懈糊替換本—^正日期··96年„月 十、申請專利範圍·· 1. 一種光轉換結構體,包含有:L---- 由陶竟複合體構成之層,係可吸收第—光之一部份 而發出第二光,並且可透過前述第-光之-部份者;及 色調控制用螢光體層,係形成於前述陶瓷複合體之 表面,且可吸收前述第一光之一部份或第二光之一部份 而發出第三光,並且可透過前述第一光之—部份或第二 光之一部份者; 又,前述陶瓷複合體係由連續且立體地相互纏繞至 少兩個以上金屬氧化物相而形成之凝固體所組成,而至 少一個前述凝固體中之金屬氧化物相含有可發出螢光 之金屬元素氧化物。 2·如申請專利範圍第1項之光轉換結構體,其中前述凝固 體係由α_Α12〇3相與以鈽活化之Y3A15〇12(yAG)相之兩 個金屬氧化物相所組成。 3·如申請專利範圍第1項之光轉換結構體,其中前述凝固 體係由a-Al2〇3相與以試活化之Y3a!5〇i2(yag)相之兩 個金屬氧化物相所組成。 4·如申請專利範圍第1項之光轉換結構體,其中前述第一 光係於200〜500nm具有尖峰之光,且前述第二光係於 510nm〜650nm具有尖峰之光,而前述第三光係於 550nm〜700nm具有尖峰之光。 5·如申請專利範圍第1項之光轉換結構體,其中前述色調 控制用榮光層係於石夕樹脂上分散有選自於由 I 视 955修竣)正替換頁10 CaAlSiN3 ·· Eu、BaMgAl10O17 : Eu、及Ca2Si5N8 : Eu戶斤 構成之群之至少一種之螢光體的層。 6. 如申請專利範圍第1項之光轉換結構體,其中前述色調 控制用螢光層係由連續且立體地相互纏繞 Y3A15012(YAG)相與添加有Cr之α-Α1203相而形成之凝 固體所組成的層。 7. —種發光裝置,係設置有可發出第一光之發光元件及如申 請專利範圍第1至6項中任一項之光轉換結構體,以接受 前述發光元件之第一光者。 8. 如申請專利範圍第7項之發光裝置,其中前述發光元件 係發光二極體。 22
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TWI461793B (zh) * | 2010-07-09 | 2014-11-21 | Lg伊諾特股份有限公司 | 顯示裝置 |
US9207380B2 (en) | 2010-07-09 | 2015-12-08 | Lg Innotek Co., Ltd. | Display device |
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KR20070086159A (ko) | 2007-08-27 |
US8044572B2 (en) | 2011-10-25 |
TW200627677A (en) | 2006-08-01 |
EP1837921A4 (en) | 2009-12-30 |
EP1837921B1 (en) | 2015-11-18 |
JPWO2006064930A1 (ja) | 2008-06-12 |
EP1837921A1 (en) | 2007-09-26 |
CN100530715C (zh) | 2009-08-19 |
CN101080823A (zh) | 2007-11-28 |
KR100885694B1 (ko) | 2009-02-26 |
JP4582095B2 (ja) | 2010-11-17 |
US20070257597A1 (en) | 2007-11-08 |
WO2006064930A1 (ja) | 2006-06-22 |
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