JP2019504135A - 被覆された狭帯域赤色蛍光体 - Google Patents
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Abstract
Description
図4B〜図4Eは、領域1〜4を示す図4Aの様々な領域の電子回折パターンであり、コーティングの非晶質構造(領域1〜3)及びCSS粒子の結晶構造(領域4)を示している。
ディスプレイバックライト及び一般照明デバイス用のパッケージ化された白色発光デバイス
Claims (36)
- 被覆蛍光体であって、
組成MSe1−xSx:Eu(式中、Mは、Mg、Ca、Sr、Ba及びZnのうちの少なくとも1つであり、0<x<1.0である)を有し、平均粒径D50が5μm〜25μmの範囲である蛍光体粒子と、
高密度の不透過性のアルミナのコーティングであって、前記蛍光体粒子の個々の1つを封入し、500nm〜5μmの範囲の厚さを有するコーティングと、を含み、
前記被覆蛍光体が、青色LEDによる励起下で、約85℃及び約85%の相対湿度で、1,000時間の時効処理後にピーク発光波長におけるフォトルミネッセンス強度の減少が約15%以下であるように構成されており、
前記被覆蛍光体が、約85℃及び約85%の相対湿度で1000時間の時効処理後の色度座標CIE(x)、CIE Δxの変化が、約10×10−3以下であるように構成されている、被覆蛍光体。 - 前記コーティングが500nm〜1.5μmの範囲の厚さを有する、請求項1に記載の被覆蛍光体。
- 前記コーティングが800nm〜1.2μmの範囲の厚さを有する、請求項1又は2に記載の被覆蛍光体。
- 前記平均粒径D50が15μM〜25μMの範囲にある、請求項1〜3のいずれか一項に記載の被覆蛍光体。
- 前記コーティングが単一層を含む、請求項1〜4のいずれか一項に記載の被覆蛍光体。
- 前記コーティングが95%を超える立体空間の割合を有する、請求項1〜5のいずれか一項に記載の被覆蛍光体。
- 前記コーティングが97%を超える立体空間の割合を有する、請求項1〜5のいずれか一項に記載の被覆蛍光体。
- 前記被覆蛍光体が、青色LEDによる励起下で、約85℃及び約85%の相対湿度で、1,000時間の時効処理後に前記ピーク発光波長におけるフォトルミネッセンス強度の前記減少が約10%以下であるように構成されている、請求項1〜7のいずれか一項に記載の被覆蛍光体。
- 前記被覆蛍光体が、約85℃及び約85%の相対湿度で、1,000時間の時効処理後の色度座標CIE(x)、CIE Δxの変化が、約5×10−3以下であるように構成されている、請求項1〜8のいずれか一項に記載の被覆蛍光体。
- MがCaである、請求項1〜9のいずれか一項に記載の被覆蛍光体。
- 約450nmのピーク発光を有する青色光源によって励起された場合、前記被覆蛍光体が、600nm〜650nmのピークフォトルミネッセンス及び約48nm〜約60nmのFWHMを有する、請求項10に記載の被覆蛍光体。
- 被覆蛍光体であって、
組成MSe1−xSx:Eu(式中、Mは、Mg、Ca、Sr、Ba及びZnのうちの少なくとも1つであり、0<x<1.0である)を有し、平均粒径D50が5μm〜25μmの範囲である蛍光体粒子と、
高密度の不透過性のアルミナのコーティングであって、前記蛍光体粒子の個々の1つを封入し、500nm〜5μmの範囲の厚さを有するコーティングと、を含み、
20℃で少なくとも5日間、1モル/Lの硝酸銀溶液中に懸濁された場合、前記被覆蛍光体が黒色に変わらないように構成されている、被覆蛍光体。 - 前記コーティングが500nm〜1.5μmの範囲の厚さを有する、請求項12に記載の被覆蛍光体。
- 前記コーティングが800nm〜1.2μmの範囲の厚さを有する、請求項12又は13に記載の被覆蛍光体。
- 前記平均粒径D50が15μm〜25μmの範囲にある、請求項12〜14のいずれか一項に記載の被覆蛍光体。
- 前記コーティングが単一層を含む、請求項12〜15のいずれか一項に記載の被覆蛍光体。
- 前記コーティングが95%を超える立体空間の割合を有する、請求項12〜16のいずれか一項に記載の被覆蛍光体。
- 前記コーティングが97%を超える立体空間の割合を有する、請求項12〜17のいずれか一項に記載の被覆蛍光体。
- 20℃で少なくとも30日間、1モル/Lの硝酸銀溶液中に懸濁された場合、前記被覆蛍光体が黒色に変わらないように構成されている、請求項12〜18のいずれか一項に記載の被覆蛍光体。
- MがCaである、請求項12〜19のいずれか一項に記載の被覆蛍光体。
- 約450nmのピーク発光を有する青色光源によって励起された場合、前記被覆蛍光体が、600nm〜650nmのピークフォトルミネッセンス及び約48nm〜約60nmのFWHMを有する、請求項20に記載の被覆蛍光体。
- 被覆蛍光体であって、
組成MSe1−xSx:Eu(式中、Mは、Mg、Ca、Sr、Ba及びZnのうちの少なくとも1つであり、0<x<1.0である)を有し、平均粒径D50が5μm〜25μmの範囲である蛍光体粒子と、
高密度の不透過性のアルミナのコーティングであって、前記蛍光体粒子の個々の1つを封入し、500nm〜5μmの範囲の厚さを有するコーティングと、を含み、
85℃で少なくとも2時間、1モル/Lの硝酸銀溶液中に懸濁された場合、前記被覆蛍光体が黒色に変わらないように構成されている、被覆蛍光体。 - 前記コーティングが500nm〜1.5μmの範囲の厚さを有する、請求項22に記載の被覆蛍光体。
- 前記コーティングが800nm〜1.2μmの範囲の厚さを有する、請求項22又は23に記載の被覆蛍光体。
- 前記平均粒径D50が15μm〜25μmの範囲にある、請求項22〜24のいずれか一項に記載の被覆蛍光体。
- 前記コーティングが単一層を含む、請求項22〜25のいずれか一項に記載の被覆蛍光体。
- 白色発光デバイスであって、
発光波長が200nm〜480nmの範囲にある励起源と、
第1の蛍光体ピーク発光波長を有する被覆蛍光体であって、前記被覆蛍光体が、組成MSe1−xSx:Eu(式中、Mは、Mg、Ca、Sr、Ba及びZnのうちの少なくとも1つであり、0<x<1.0である)を有し、平均粒径D50が5μm〜25μmの範囲である蛍光体粒子と、前記蛍光体粒子の個々の1つを封入し、500nm〜5μmの範囲の厚さを有する高密度の不透過性のアルミナのコーティングと、を含む、被覆蛍光体であって、
前記被覆蛍光体が、青色LEDによる励起下で、約85℃及び約85%の相対湿度で、1,000時間の時効処理後に前記ピーク発光波長におけるフォトルミネッセンス強度の前記減少が約15%以下であるように構成されており、約85℃及び約85%の相対湿度で、1,000時間の時効処理後の色度座標CIE(x)、CIE Δxの変化が、約10×10−3以下である、被覆蛍光体と、
前記第1の蛍光体ピーク波長とは異なる第2の蛍光体ピーク発光波長を有する第2の蛍光体と、を備える、白色発光デバイス。 - 前記コーティングが500nm〜1.5μmの範囲の厚さを有する、請求項27に記載の白色発光デバイス。
- 前記コーティングが800nm〜1.2μmの範囲の厚さを有する、請求項27又は請求項28に記載の白色発光デバイス。
- 前記平均粒径D50が15μm〜25μmの範囲にある、請求項27〜29のいずれか一項に記載の白色発光デバイス。
- 前記コーティングが単一層を含む、請求項27〜30のいずれか一項に記載の白色発光デバイス。
- 前記コーティングが95%を超える立体空間の割合を有する、請求項27〜31のいずれか一項に記載の白色発光デバイス。
- 前記コーティングが97%を超える立体空間の割合を有する、請求項27〜32のいずれか一項に記載の白色発光デバイス。
- 前記被覆蛍光体が、約450nmの波長で放射線を吸収し、約600nm〜約650nmのフォトルミネッセンスピーク発光波長を有する光を発光し、前記第2の蛍光体が、約515nm〜約570nmのピーク発光波長を有する緑色又は黄色発光蛍光体である、請求項27〜33のいずれか一項に記載の白色発光デバイス。
- 前記励起源が、440nm〜480nmの範囲の発光波長を有し、前記被覆蛍光体が、約625nm〜約645nmの第1の蛍光体ピーク発光波長を有し、前記第2の蛍光体のピーク発光波長が、約520nm〜約545nmであり、前記白色発光デバイスが、青色、緑色及び赤色のピークが明確に分離された発光スペクトル、及びNTSCの少なくとも85%のLCD RGBカラーフィルタの後の色域を有する、請求項27又は請求項34に記載の白色発光デバイス。
- 前記被覆蛍光体及び前記第2の蛍光体が遠隔蛍光体成分内に含まれており、前記第2の蛍光体が約500nm〜約600nmのピーク発光波長を有する緑色−黄色蛍光体であり、前記被覆蛍光体が、約600nm〜約650nmのピーク発光波長を有する、請求項27〜35のいずれか一項に記載の白色発光デバイス。
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