White emitting light source and luminescent material
AssigneeKoninklijke Philips N.V.
InventorsJoerg Meyer, Hans-Helmut Bechtel, Walter Mayr, Peter Schmidt, Baby-Seriyati Schreinemacher, Detlef Uwe Wiechert
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Abstract
The invention relates to a white emitting light source with an improved luminescent material of the formula (AEN2/3)*b(MN)*c(SiN4/3)*d1CeO3/2*d2EuO*xSiO2*yAlO3/2 wherein AE is an alkaline earth metal chosen of the group of Ca, Mg, Sr and Ba or mixtures thereof and M is a trivalent element chosen of the group of Al, B, Ga, Sc with d1>10*d2. In combination with a UV to blue light generating device this material leads to an improved light quality and stability, especially an improved temperature stability for a wide range of applications.
Claims20
A device comprising:
- a light source configured to emit light having a wavelength between 400 nm and 480 nm;
- and
- a luminescent material positioned to absorb light emitted by the light source, the luminescent material comprising (AEN2/3)*b(MN)*c(SiN4/3)*d1CeO3/2*d2EuO*xSiO2*yAlO3/2 wherein AE is an alkaline earth metal chosen of the group of Ca, Mg, Sr and Ba or mixtures thereof and M is a trivalent element chosen of the group of Al, B, Ga, Sc or mixtures thereof, wherein
- 0.95≦2*(a+d1+d2)/(b+c+x+y)≦1.2
- a+d1+d2≧c+x,
- (b+y):(c+x)≧1,
- (b+y)≦1+10*d1,
- b≧5*y,
- c≧10*x,
- 0.0001≦d1≦0.2 and d1≧10*d2.
A device comprising:
- a light source;
- and
- a ceramic luminescent material positioned to absorb light emitted by the light source, the luminescent material comprising (AEN2/3)*b(MN)*c(SiN4/3)*d1CeO3/2*d2EuO*xSiO2*yAlO3/2 wherein AE is an alkaline earth metal chosen of the group of Ca, Mg, Sr and Ba or mixtures thereof and M is a trivalent element chosen of the group of Al, B, Ga, Sc or mixtures thereof, wherein
- 0.95≦2*(a+d1+d2)/(b+c+x+y)≦1.2
- a+d1+d2≧c+x,
- (b+y):(c+x)≧1,
- (b+y)≦1+10*d1,
- b≧5*y,
- c≧10*x,
- 0.0001≦d1≦0.2 and d1≧10*d2.
Dependencies are inferred from the claim text.