Yellow light-emitting halophosphate phosphors and light sources incorporating the same
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United States of America Patent
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Sep 9, 2003
Grant Date -
Aug 7, 2003
app pub date -
May 21, 2001
filing date -
May 21, 2001
priority date (Note) -
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Abstract
Halophosphate luminescent materials co-activated with europium and manganese ions and having the general formula of (Ca,Sr,Ba,Mg).sub.5 (PO.sub.4).sub.3 :Eu.sup.2+,Mn.sup.2+ are disclosed. The inclusion of manganese shifts the peak emission to longer wavelengths and, thus, is beneficial in generating a bright yellow-to-orange light. White-light sources are produced by disposing a halophosphate luminescent material, optionally with a blue light-emitting phosphor, in the vicinity of a near UV/blue LED. Blue light-emitting phosphors that may be used in embodiments of the present inventions are Sr.sub.4 Al.sub.14 O.sub.25 :Eu.sup.2+, Sr.sub.6 P.sub.6 BO.sub.20 :Eu.sup.2+, BaAl.sub.8 O.sub.13 :Eu.sup.2+, (Sr,Mg,Ca,Ba).sub.5 (PO.sub.4).sub.3 Cl:Eu.sup.2+, and Sr.sub.2 Si.sub.3 O.sub.6.2SrCl.sub.2 :Eu.sup.2+.
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