Phosphors containing oxides of alkaline-earth and Group-IIIB metals and light sources incorporating the same
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United States of America Patent
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Oct 26, 2004
Grant Date -
Jan 1, 2004
app pub date -
Jun 28, 2002
filing date -
Jun 28, 2002
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Abstract
Phosphors comprises oxides of at least an alkaline-earth metal selected from the group consisting of strontium, barium, calcium, and combinations thereof and at least a Group-IIIB metal selected from the group consisting of aluminum, gallium, indium, and combinations thereof activated with rare-earth metal ions comprising at least europium. The phosphors are characterized in that the ratio of positive ions and negative ions is off-stoichiometric. The phosphors are excitable efficiently in the near UV-to-blue light range. Blends containing at least one of these phosphors in conjunction with at least a light-emitting diode can provide light sources having a high luminosity and a high color-rendering index.
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