Importance

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Abstract

The invention relates to a light source comprising a phosphor composition and a light emitting device such as an LED or a laser diode. The phosphor composition absorbs radiation having a first spectrum and emits radiation having a second spectrum and comprises at least one of: YBO.sub.3 :Ce.sup.3+,Tb.sup.3+ ; BaMgAl.sub.10 O.sub.17 :Eu.sup.2+,Mn.sup.2+ ; (Sr,Ca,Ba)(Al,Ga).sub.2 S.sub.4 :Eu.sup.2+ ; and Y.sub.3 Al.sub.5 O.sub.12 --Ce.sup.3+ ; and at least one of: Y.sub.2 O.sub.2 S:Eu.sup.3+,Bi.sup.3+ ; YVO.sub.4 :Eu.sup.3+,Bi.sup.3+ ; SrS:Eu.sup.2+ ; SrY.sub.2 S.sub.4 :Eu.sup.2+ ; CaLa.sub.2 S.sub.4 :Ce.sup.3+ ; and (Ca,Sr)S:Eu.sup.2+. The phosphor composition and the light source together can produce white light with pleasing characteristics, such as a color temperature of 3000-6500.degree. K, a color rendering index of about 83-87, and a device luminous efficacy of about 10-20 lumens per watt.

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First Claim