JP2011089121A5 - 赤色蛍光体、赤色蛍光体の製造方法、発光素子パッケージ及び照明装置 - Google Patents

赤色蛍光体、赤色蛍光体の製造方法、発光素子パッケージ及び照明装置 Download PDF

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JP2011089121A5
JP2011089121A5 JP2010237961A JP2010237961A JP2011089121A5 JP 2011089121 A5 JP2011089121 A5 JP 2011089121A5 JP 2010237961 A JP2010237961 A JP 2010237961A JP 2010237961 A JP2010237961 A JP 2010237961A JP 2011089121 A5 JP2011089121 A5 JP 2011089121A5
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本発明は赤色蛍光体に関し、特に、高い発光特性と、優れた熱的・化学的安定性を有する長波長の赤色光を発光することができる赤色蛍光体、その製造方法、これを用いた発光素子パッケージ及び照明装置に関する。
また、他の目的は、青色及び紫外線波長領域を励起源として赤色光を発光する赤色蛍光体を含み自然光に近い演色性に優れた白色光を放出することができる発光素子パッケージ及び照明装置を提供することにある。
本発明による一実施形態は、(Sr,M)SiO4−x:Euの組成式で表される無機化合物を備え、上記のMは金属元素であり、0<x<4、y=2x/3であり、前記Mは、Mg、Ga、Ba、Li、Na、K、Rb及びCsで構成されるグループから選択された少なくとも1種の元素を含むことを特徴とする赤色蛍光体を提供する。
この場合、上記の赤色蛍光体は、青色または紫外線波長領域を励起源として約600nm〜700nmの波長帯域の発光ピークを有することができる。また、上記のxは、0.15≦x≦3の条件を満たすことができる。
また、上記の組成式においてSiの一部は、B、Al、Gan、Ti、Zr、Gf、Sn及びPbで構成されたグループから選択された少なくとも1種の元素に置換ることができる
一方、他の実施形態は、Sr−含有化合物及びM−含有化合物のうち少なくとも1つの化合物、Eu−含有化合物、Si−含有酸化物及びSi−含有窒化物を含む原料物質を混合するステップと、上記の混合物を焼成して、(Sr,M)SiO4−x:Euの組成式で表される無機化合物を得るステップと、を含み、上記のMは、Mg、Ga、Ba、Li、Na、K、Rb及びCsで構成されるグループから選択された少なくとも1種の元素を含み、0<x<4、y=2x/3であることを特徴とする赤色蛍光体の製造方法を提供する。
この場合、上記の原料物質を混合するステップは、上記のマンガン炭酸塩をさらに混合することができ、また、上記の原料物質を混合するステップは、B、Al、Gan、Ti、Zr、Gf、Sn及びPbで構成されたグループから選択された少なくとも1種の元素の化合物をさらに混合することができる。
一方、さらに他の実施形態は、励起光を放出する発光素子と、上記の励起光を吸収して可視光を放出する波長変換部と、を含み、上記の波長変換部は、(Sr,M)SiO4−x:Euの組成式で表される無機化合物を備える赤色蛍光体を少なくとも含み、0<x<4、y=2x/3であり、前記Mは、Mg、Ga、Ba、Li、Na、K、Rb及びCsで構成されるグループから選択された少なくとも1種の元素であことを特徴とする発光素子パッケージを提供する。
また、上記の発光素子が青色発光ダイオードであって、緑色蛍光体または黄色蛍光体をさらに含み、上記の発光素子パッケージの最終出力光は白色光であることを特徴とする。
一方、さらに他の実施形態は、基板と、上記の基板上に実装された複数の光源と、上記の複数の光源の上部に配置され、上記の光源から入射された光を均一に拡散させる拡散シートと、を含み、上記の光源は、励起光を放出する発光素子と、上記の励起光を吸収して可視光を放出する波長変換部と、からなり、上記の波長変換部は、(Sr,M)SiO4−x:Euの組成式で表される無機化合物を備える赤色蛍光体を少なくとも含み、0<x<4、y=2x/3であり、前記Mは、Mg、Ga、Ba、Li、Na、K、Rb及びCsで構成されるグループから選択された少なくとも1種の元素を含むことを特徴とする照明装置を提供する。

Claims (13)

  1. (Sr,M)SiO4−x:Euの組成式で表される無機化合物を備え、前記Mは金属元素であり、0<x<4、y=2x/3であり、前記Mは、Mg、Ga、Ba、Li、Na、K、Rb及びCsで構成されるグループから選択された少なくとも1種の元素を含むことを特徴とする赤色蛍光体。
  2. 青色または紫外線波長領域を励起源として600nm〜700nmの波長帯域の発光ピークを有することを特徴とする請求項1に記載の赤色蛍光体。
  3. 前記xは、0.15≦x≦3の条件を満たすことを特徴とする請求項1または2に記載の赤色蛍光体。
  4. 前記組成式においてSiの一部は、B、Al、GaIn、Ti、Zr、Gf、Sn及びPbで構成されたグループから選択された少なくとも1種の元素に置換されることを特徴とする請求項1乃至3の何れか1項に記載の赤色蛍光体。
  5. 前記赤色蛍光体は、Mnをさらに含むことを特徴とする請求項1乃至4の何れか1項に記載の赤色蛍光体。
  6. 前記無機化合物と異なる結晶相の混合物をさらに含み、前記無機化合物の含有量が50質量%以上であることを特徴とする請求項1乃至5の何れか1項に記載の赤色蛍光体。
  7. 前記赤色蛍光体の結晶構造は、斜方晶系であることを特徴とする請求項1乃至6の何れか1項に記載の赤色蛍光体。
  8. Sr−含有化合物及びM−含有化合物のうち少なくとも1つの化合物、Eu−含有化合物、Si−含有酸化物及びSi−含有窒化物を含む原料物質を混合して混合物を作成するステップと、
    前記混合物を焼成して、(Sr,M)SiO4−x:Euの組成式で表される無機化合物を得るステップと、を含み、前記Mは、Mg、Ga、Ba、Li、Na、K、Rb及びCsで構成されるグループから選択された少なくとも1種の元素を含み、0<x<4、y=2x/3であることを特徴とする赤色蛍光体の製造方法。
  9. 前記原料物質を混合するステップは、マンガン炭酸塩をさらに混合することを特徴とする請求項に記載の赤色蛍光体の製造方法。
  10. 前記原料物質を混合するステップは、B、Al、GaIn、Ti、Zr、Gf、Sn及びPbで構成されたグループから選択された少なくとも1種の元素の化合物をさらに混合することを特徴とする請求項8または9に記載の赤色蛍光体の製造方法。
  11. 励起光を放出する発光素子と、
    前記励起光を吸収して可視光を放出する波長変換部と、を含み、
    前記波長変換部は、(Sr,M)SiO4−x:Euの組成式で表される無機化合物を備える赤色蛍光体を少なくとも含み、0<x<4、y=2x/3であり、前記Mは、Mg、Ga、Ba、Li、Na、K、Rb及びCsで構成されるグループから選択された少なくとも1種の元素であことを特徴とする発光素子パッケージ。
  12. 前記発光素子が青色発光ダイオードであって、緑色蛍光体または黄色蛍光体をさらに含み、前記発光素子パッケージの最終出力光は白色光であることを特徴とする請求項11に記載の発光素子パッケージ。
  13. 基板と、
    前記基板上に実装された複数の光源と、
    前記複数の光源の上部に配置され、前記複数の光源から入射された光を均一に拡散させる拡散シートと、を含み、
    前記複数の光源は、励起光を放出する発光素子と、前記励起光を吸収して可視光を放出する波長変換部と、からなり、前記波長変換部は、(Sr,M)SiO4−x:Euの組成式で表される無機化合物を備える赤色蛍光体を少なくとも含み、0<x<4、y=2x/3であり、前記Mは、Mg、Ga、Ba、Li、Na、K、Rb及びCsで構成されるグループから選択された少なくとも1種の元素を含むことを特徴とする照明装置。
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