High luminosity phosphor blends for generating white light from near-UV/blue light-emitting devices

摘要

The present invention provides phosphor blends that are excitable by electromagnetic radiation having wavelengths in the near Uv-to-blue range (from about 315 nm to about 480 nm) to emit a visible light in a range of wavelengths from about 490 nm to about 770 nm. A phosphor blend of the present invention comprises a mixture of at least two phosphors. The first phosphor of the mixture comprises Sr₂P₂O₇:Eu²⁺,Mn²⁺; wherein at least one element selected from the group consisting of Ba, Zn, Ca, and Mg partially substitutes strontium. The second phosphor is at least one selected from the group consisting of Sr₄Al₁₄O₂₅:Eu²⁺; (Ba, Sr, Ca)MgAl₁₀O₁₇:Eu²⁺; (Ba, Sr, Ca)MgAl₁₀O₁₇:Eu²⁺,Mn²⁺; (Sr, Ba, Ca, Mg)₅(PO₄)₃Cl:Eu²⁺; and 3.5 MgO.0.5MgF₂.GeO₂:Mn⁴⁺.