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US 2006/0049414 A1Published application
Novel oxynitride phosphors
OwnerRamachandran Chandran, Dan Hancu +6inventors
InventorsRamachandran Chandran, Dan Hancu, Nadagouda Mallikarjuna, Emil Radkov, Anant Setlur, Venkatraman Sivaramakrishan, Alok Srivastava, Madras Shankar
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Abstract
Disclosed are oxynitride and oxide phosphor compositions having various formulations. Also disclosed are phosphor blends of the above phosphors and one or more additional phosphors and light emitting devices incorporating the same. The phosphors and their blends can be used in saturated color light sources (e.g. traffic signals), as well as white light sources for general illumination purposes.
Claims15
A lighting apparatus for emitting white light comprising:
- a light source emitting with a peak radiation at from about 250 nm to about 550 nm and a phosphor material radiationally coupled to the light source, the phosphor material comprising at least one of:
- a) M4+xLn7−x(Si,Ge)12−y(Al,Ga)yN23−x−yO1+x+y[BN3:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+ where 0≦x≦7, 0≦y≦12;
- M is at least one of Mg, Ca, Sr, Ba, or Zn and Ln is at least one of the rare earth elements, Sc, Y, Bi, or Sb;
- b) Ln3−xMx(Si,Ge)8N11−xO4+x:RE;
- Ln3(Si,Ge)8−x(Al,Ga)xN11−xO4−x:RE;
- or Ln3−xMx(Si,Ge)8−xAlxN11−x/2O4−x/4:RE where Ln is at least one of Lu, Y, La, Gd, or Sc, M is at least one of Ca, Sr, Ba or Zn, 0≦x≦3, and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- c) Ln4Si2O7N2:RE where Ln is at least one of Lu, Y, La, Gd, or Sc and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Eu3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- d) Ln4−xMx(Si,Ge)2N2−xO7+x or Ln4−xMx(Si,Ge)2−y(Al,Ga)yN2−x−yO7+x+y:RE where Ln is at least one of Lu, Y, La, Gd, or Sc, M is at least one of Ca, Sr, Ba, or Zn, 0≦x≦2, 0≦y≦2, and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- e) MBNO:Eu2+,Mn2+ where M is at least one of Mg, Ca, Ba, Sr, or Zn;
- or
- f) M0.755Lnx(Al,Ga)1.71(Si,Ge)2.29O8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+, where 0≦x≦0.755;
- M0.755(Al,Ga)1.71−x(Si,Ge)2.29+xO8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+ where 0≦x≦1.71;
- M1−xLnx(Al,Ga)2(Si,Ge)2O8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+, where 0≦x≦1;
- or M(Al,Ga)2−x(Si,Ge)2+xO8−xNx:Ce3+,Eu3+,Bi3+, Tb3+,Eu2+,Mn2+, where 0≦x≦2, and wherein for any of the preceding M is at least one of Mg, Ca, Ba, or Zn and Ln is at least one of La, Y, Gd, Lu, Pr, Nd or Sm.
11 more elements
A phosphor composition comprising:
- a) M4+xLn7−x(Si,Ge),12−xY(Al,Ga)yN23−x−yO1+x+y[BN3]:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+ where 0≦x≦7, 0≦y≦12;
- M is at least one of Mg, Ca, Sr, Ba, or Zn and Ln is at least one of the rare earth elements, Sc, Y, Bi, or Sb;
- b) Ln3−xMx(Si,Ge)8N11−xO4+x:RE;
- Ln3(Si,Ge)8−x(Al,Ga)xN11−xO4+x:RE;
- or Ln3−xMx(Si,Ge)8−xAlxN11−x/2:RE where Ln is at least one of Lu, Y, La, Gd, or Sc, M is at least one of Ca, Sr, Ba or Zn, 0≦x≦3, and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- c) Ln4Si2O7N2:RE where Ln is at least one of Lu, Y, La, Gd, or Sc and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Eu3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- d) Ln4Mx(Si,Ge)2N2−xO7+x or Ln4−xMx(Si,Ge)2−y(Al,Ga)yN2−x−yO7+x+y:RE where Ln is at least one of Lu, Y, La, Gd, or Sc, M is at least one of Ca, Sr, Ba, or Zn, 0≦x≦2, 0≦y≦2, and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- e) MBNO:Eu2+, Mn2+ where M is at least one of Mg, Ca, Ba, Sr, or Zn;
- or
- f) M0.755−xLnx(Al,Ga)1.71(Si,Ge)2.29O8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+, where 0≦x≦0.755;
- M0.755(Al,Ga)1.71−x(Si,Ge)2.29+xO8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+ where 0≦x≦1.71;
- M1−xLnx(Al,Ga)2(Si,Ge)2O8−xNx:Ce3+,Eu3+, Bi3+,Tb3+,Eu2+,Mn2+, where 0≦x≦1;
- or M(Al,Ga)2−x(Si,Ge)2+xO8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+, where 0≦x≦2, and wherein for any of the preceding M is at least one of Mg, Ca, Ba, or Zn and Ln is at least one of La, Y, Gd, Lu, Pr, Nd or Sm.
10 more elements
A phosphor blend including a first phosphor comprising:
- a) M4+xLn7−x)(Si,Ge)12−y(Al,Ga)yN23−x−yO1+x+y[BN3]:Ce3+,Eu3+,Bi3+,Tb3°,Eu2+,Mn2+ where 0≦x≦7, 0≦y≦12;
- M is at least one of Mg, Ca, Sr, at least one of the rare earth elements, Sc, Y, Bi, or Sb;
- b) Ln3−xMx(Si,Ge)8N11−xO4+:RE;
- Ln3(Si,Ge)8−x(Al,Ga)xN11−xO4+x:RE;
- or Ln3−xMx(Si,Ge)8−xAlxN11−x/2O4−x/4:RE where Ln is at least one of Lu, Y, La, Gd, or Sc, M is at least one of Ca, Sr, Ba or Zn, 0≦x≦3, and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- c) Ln4Si2O7N2:RE where Ln is at least one of Lu, Y, La, Gd, or Sc and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Eu3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- d) Ln4−xMx(Si,Ge)2N2−xO7+x or Ln4−xMx(Si,Ge)2−y(Al,Ga)yN2−x−yO7+x+y:RE where Ln is at least one of Lu, Y, La, Gd, or Sc, M is at least one of Ca, Sr, Ba, or Zn, 0≦x≦2, 0≦y≦2, and RE is at least one of Ce3+, Tb3+, Pr3+, Dy3+, Sm3+, Eu3+, Eu2+, Mn2+, or Bi3+;
- e) MBNO:Eu2+,Mn2+ where M is at least one of Mg, Ca, Ba, Sr, or Zn;
- or
- f) M0.755−xLnx(Al,Ga)1.71(Si,Ge)2.29O8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+, where 0≦x≦0.755;
- M0.755(Al,Ga)1.71−x(Si,Ge)2.29+xO8−xNx:Ce3+,Eu2+,Mn2+ where 0≦x≦1.71;
- M1−xLnx(Al,Ga)2(Si,Ge)2O8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+, where 0≦x≦1;
- or M(Al,Ga)2−x(Si,Ge)2+xO8−xNx:Ce3+,Eu3+,Bi3+,Tb3+,Eu2+,Mn2+, where 0≦x≦2, and wherein for any of the preceding M is at least one of Mg, Ca, Ba, or Zn and Ln is at least one of La, Y, Gd, Lu, Pr, Nd or Sm.
10 more elements
Dependencies are inferred from the claim text.