JP5862447B2 - 蛍光体粒子及び発光ダイオード - Google Patents
蛍光体粒子及び発光ダイオード Download PDFInfo
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
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- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/30—Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6
- C01F17/32—Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6 oxide or hydroxide being the only anion, e.g. NaCeO2 or MgxCayEuO
- C01F17/34—Aluminates, e.g. YAlO3 or Y3-xGdxAl5O12
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Description
(A1-xBx)3C5O12 (1)
(式中、AはY,Gd及びLuから選ばれる1種以上の希土類元素、BはCe,Nd及びTbから選ばれる1種以上の希土類元素、CはAl及びGaから選ばれる1種以上の元素であり、xは0.002≦x≦0.2である。)
で示されるガーネット相を含有し、複数の一次粒子で構成された球形の多結晶体二次粒子であり、該二次粒子の平均粒子径が5〜50μmである蛍光体粒子が、発光体の封止樹脂など、蛍光体粒子を分散させる樹脂、無機ガラス等の材料中において、励起光の吸収率を向上させることができ、更に、長時間使用においても蛍光体粒子−封止材料の剥離が抑制され、青色LEDからの励起光により励起されて発光する黄色発光蛍光体として、白色LEDに好適に用いることができることを見出した。
請求項1:
下記組成式(1)
(A1-xBx)3C5O12 (1)
(式中、AはY,Gd及びLuから選ばれる1種以上の希土類元素、BはCe,Nd及びTbから選ばれる1種以上の希土類元素、CはAl及びGaから選ばれる1種以上の元素であり、xは0.002≦x≦0.2である。)
で示されるガーネット相を含有し、複数の一次粒子で構成された球形の多結晶体二次粒子であり、該二次粒子の平均粒子径が5〜50μmであり、励起波長450nm、発光波長480〜780nmの範囲において、吸収率が90%以上、外部量子効率が85%以上であり、
上記組成式(1)中のA、B及びCで示される元素の1種又は2種以上を含む酸化物を原料とし、該酸化物の粉末を1種で又は2種以上、上記A、B及びCで示される元素が上記組成の比率となるように混合し、上記原料酸化物にフラックスを添加することなく平均粒子径5〜65μmに造粒し、得られた造粒粒子をプラズマ中で溶融してプラズマ外で球状に固化させ、更に、得られた粒子を非酸化性雰囲気中900〜1,700℃で加熱処理して得られたことを特徴とする蛍光体粒子。
請求項2:
上記一次粒子の粒子径が0.1〜5μmであることを特徴とする請求項1記載の蛍光体粒子。
請求項3:
多結晶粒子の表面平均***高さが0.02〜2μmであることを特徴とする請求項1又は2記載の蛍光体粒子。
請求項4:
Ba含有率が10ppm以下であることを特徴とする請求項1乃至3のいずれか1項記載の蛍光体粒子。
請求項5:
上記組成式(1)中のBで示される希土類元素が、Ce及びNdから選ばれることを特徴とする請求項1乃至4のいずれか1項記載の蛍光体粒子。
請求項6:
上記造粒粒子をプラズマ中で溶融して液滴とし、プラズマ外で球状に固化させたことを特徴とする請求項1乃至5のいずれか1項記載の蛍光体粒子。
請求項7:
請求項1乃至6のいずれか1項記載の蛍光体粒子を、発光素子の発光光路上に直接又は樹脂若しくは無機ガラスに分散させて積層してなることを特徴とする発光ダイオード。
また、本発明は、上記蛍光体粒子の製造方法として、以下の製造方法が関連する。
[1] 上記組成式(1)中のA、B及びCで示される元素の1種又は2種以上を含む酸化物を原料とし、該酸化物の粉末を1種で又は2種以上、上記A、B及びCで示される元素が上記組成の比率となるように混合して平均粒子径5〜65μmに造粒し、得られた造粒粒子をプラズマ中で溶融してプラズマ外で球状に固化させ、更に、得られた粒子を非酸化性雰囲気中900〜1,700℃で加熱処理することを特徴とする蛍光体粒子の製造方法。
[2] 上記原料酸化物にフラックスを添加することなく製造することを特徴とする[1]記載の製造方法。
本発明の蛍光体粒子は、下記組成式(1)
(A1-xBx)3C5O12 (1)
(式中、AはY,Gd及びLuから選ばれる1種以上の希土類元素、BはCe,Nd及びTbから選ばれる1種以上の希土類元素、CはAl及びGaから選ばれる1種以上の元素であり、xは0.002≦x≦0.2である。)
で示されるガーネット相を含有し、複数の一次粒子で構成された球形の多結晶体二次粒子の構造を有する。
本発明の蛍光体粒子の製造においては、まず、製造する蛍光体粒子の金属種に応じて、単一又は複数金属の酸化物、複合酸化物及び混合酸化物から適宜選択して蛍光体原料組成物を作製する。この蛍光体組成物を純水、有機溶剤などを用いてスラリー状とする。
純度99.9%、平均粒径1.0μmの(Y2.94Ce0.06)Al5O12の複合酸化物微粉末1,000gを、脱イオン水1,500g、ポリアクリル酸アンモニウム10g、カルボキシメチルセルロース2gと共にボールミルで6時間混合した。得られたスラリーから、遠心噴霧装置を用いて造粒し、平均粒径21μmの造粒粒子を得た。得られた造粒粒子を1,400℃、2時間、大気中で熱処理し、有機成分を除去した。
純度99.9%、平均粒子径1.0μmの酸化イットリウム(Y2O3)粉末と、純度99.0%、平均粒子径0.5μmの酸化アルミニウム(Al2O3)粉末と、純度99.9%、平均粒子径0.2μmの酸化セリウム(CeO2)粉末とを、各々、Y:Al:Ce=2.94:5:0.06のモル比で混合し、1,000gの混合粉を得た。得られた混合粉に、更にフラックスとしてフッ化バリウムを20g添加して十分に混合し、アルミナ坩堝に充填し、大気中、1,400℃で5時間熱処理した。得られた焼成体を、ボールミルを用いて水中で解砕し、酸洗浄、水洗、分離、乾燥、分級して、蛍光体粒子を得た。
Claims (7)
- 下記組成式(1)
(A1-xBx)3C5O12 (1)
(式中、AはY,Gd及びLuから選ばれる1種以上の希土類元素、BはCe,Nd及びTbから選ばれる1種以上の希土類元素、CはAl及びGaから選ばれる1種以上の元素であり、xは0.002≦x≦0.2である。)
で示されるガーネット相を含有し、複数の一次粒子で構成された球形の多結晶体二次粒子であり、該二次粒子の平均粒子径が5〜50μmであり、励起波長450nm、発光波長480〜780nmの範囲において、吸収率が90%以上、外部量子効率が85%以上であり、
上記組成式(1)中のA、B及びCで示される元素の1種又は2種以上を含む酸化物を原料とし、該酸化物の粉末を1種で又は2種以上、上記A、B及びCで示される元素が上記組成の比率となるように混合し、上記原料酸化物にフラックスを添加することなく平均粒子径5〜65μmに造粒し、得られた造粒粒子をプラズマ中で溶融してプラズマ外で球状に固化させ、更に、得られた粒子を非酸化性雰囲気中900〜1,700℃で加熱処理して得られたことを特徴とする蛍光体粒子。 - 上記一次粒子の粒子径が0.1〜5μmであることを特徴とする請求項1記載の蛍光体粒子。
- 多結晶粒子の表面平均***高さが0.02〜2μmであることを特徴とする請求項1又は2記載の蛍光体粒子。
- Ba含有率が10ppm以下であることを特徴とする請求項1乃至3のいずれか1項記載の蛍光体粒子。
- 上記組成式(1)中のBで示される希土類元素が、Ce及びNdから選ばれることを特徴とする請求項1乃至4のいずれか1項記載の蛍光体粒子。
- 上記造粒粒子をプラズマ中で溶融して液滴とし、プラズマ外で球状に固化させたことを特徴とする請求項1乃至5のいずれか1項記載の蛍光体粒子。
- 請求項1乃至6のいずれか1項記載の蛍光体粒子を、発光素子の発光光路上に直接又は樹脂若しくは無機ガラスに分散させて積層してなることを特徴とする発光ダイオード。
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