Patent number: 6517741
Abstract: A color display screen comprises a red phosphor and a color pigment having a general formula selected from the group consisting of: A1−xA′xBO2−xN1+x, where 0<x<1, A is Mg(II), Ca(II), Sr(II), Ba(II) or Zn(II), A′ is a trivalent rare earth metal, Bi(III), Al(III) or Fe(III), B is V(V), Nb(V), Ta(V) or W(V); AB1−xB′xBO1+xN2−x, where 0<x<1, A is Mg(II), Ca(II), Sr(II), Ba(II) or Zn(II), A′ is a trivalent rare earth metal, Bi(III), Al(III) or Fe(III), B is V(V), Nb(V), Ta(V) or W(V) and B′ is Ti(IV), Zr(IV), Hf(IV), Sn(IV), Ge(IV), Si(IV), Nb(IV) or Ta(IV); AyA′2−yB2O5+yN2−y, where 0 <y<2, A is Mg(II), Ca(II), Sr(II). Ba(II) or Zn(II), A′ is a trivalent rare earth metal, Bi(III), Al(III) or Fe(III), B is V(V), Nb(V), Ta (V) or W(V); A2B2−yB′yO5+yN2−y, where 0<y<2, A is Mg(II), Ca(II), Sr(II).
Type:
Grant
Filed:
January 18, 2000
Date of Patent:
February 11, 2003
Assignee:
Koninklijke Philips Electronics N.V.
Inventors:
Claus Feldmann, Joachim Opitz