Patent ID: 7652416

Claim:
A lamp comprising a phosphor in which a magnetoplumbite phase is epitaxially formed on a surface of a phosphor having a β alumina phase, wherein the phosphor having a β alumina phase includes a phosphor [(M II , Eu 2+ )MgAl 10 O 17 ] or [(M II , Eu 2+ )(Mg, Mn)Al 10 O 17 ] (where M II is Ba, Ca, Sr, or mixtures thereof]; wherein the phosphor having a β alumina phase is a blue phosphor; and wherein the magnetoplumbite phase comprises material represented by Formula 1, 2, or 3 below: M 1 (II) M′ (III) 12 O 19 Formula 1 M 2 (III) M″ (II) M′ (III) 11 O 19 Formula 2 M 3 (III) M′ (III) 11 O 18 Formula 3 wherein M 1 (II) is Ca, Sr, Pb or Eu, M′ (III) is Al, Ga or mixtures thereof, M 2 (III) is lanthanide including La, Ce, Pr, Nd, Sm, Eu or Gd, M″ (II) is Ni, Co, Fe, Mn or Mg, and M 3 (III) is La, Ce or mixtures thereof.