Patent ID: 8597542

Claim:
A luminous substance containing a monocrystalline or polycrystalline garnet represented by the formula: (Y 1−w−2x−y Gd w Eu 2+ x M x RE y ) 3 (Al 1−z Ga z ) 5 O 12 , wherein x corresponds to a numerical value of greater than 0 up to maximum of 0.1, y to a numerical value of 0 to less than 1, z to a numerical value of 0 to 1, and w to a numerical value of greater 0 to 1−2x−y, M represents Si and/or Zr, and RE designates the elements of the rare earth metals and containing Eu 2+ doping and doping with Si 4+ and/or Zr 4+ , wherein Eu 2+ content of said luminous substance is less than 1 mole % of the entire europium doping.