Patent ID: 8900482
Filing Date: 2014-12-02
Classification: C09K,H01L

Abstract:
1. A light emitting device, comprising: a light emitting diode to emit light; and a phosphor to change a wavelength of the light, the phosphor covering at least a portion of the light emitting diode, the phosphor comprising: a compound comprising a host lattice and a luminescent ion, the luminescent ion comprising at least one rare earth element within the host lattice, wherein the host lattice comprises first ions and oxygen, wherein a portion of the first ions are substituted by copper ions, wherein the compound is to emit light upon excitation with ultraviolet light or visible light, due to direct-type transitions, f-d transitions, or charge transfer transitions, wherein the luminescent ion does not comprise copper, and wherein the compound has the formula: M′ is Cu or a combination of Cu and Pb; M″ is Li, Na, K, Rb, Cs, Au, Ag, or any combination thereof; M′″ is Be, Mg, Ca, Sr, Ba, Zn, Cd, Mn, or any combination thereof; M″″ is Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or any combination thereof, or is at least one of Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb in combination with at least one of Bi, Sn, Sb, Sc, Y, La, Ce, In, and Lu; X is F, CI, Br, I, or any combination thereof; 0<a≦4; 0≦b≦2; 0≦c≦2; 0≦d≦1; 0≦e≦1; 0≦f≦1; 0≦g≦1; 0<h≦2; 1≦x≦2; and 0≦y≦5.