Phosphor, its preparation method and light emitting devices using the same
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Accused Products
Abstract
A phosphor can be excited by UV, purple or blue light LED, its preparation method, and light emitting devices incorporating the same. The phosphor contains rare earth, silicon, alkaline-earth metal, halogen, and oxygen, as well as aluminum or gallium. Its General formula of is aLn2O3.MO.bM′2O3.fSiO2.cAXe: dR, wherein Ln is at least one metal element selected from a group consisting of Sc, Y, La, Pr, Nd, Gd, Ho, Yb and Sm; M is at least one metal element selected from a group consisting of Ca, Sr and Ba; M′ is at least one metal element selected from Al and Ga; A is at least one metal element selected from a group consisting of Li, Na, K, Mg, Ca, Sr and Ba; X is at least one element selected from F and Cl; R is at least one metal element selected from a group consisting of Ce, Eu, Tb and Mn; 0.01≦a≦2, 0.35≦b≦4, 0.01≦c≦1, 0.01≦d≦0.3, 0.01≦f≦3, 0.6≦e≦2.4. The phosphor has broad emitting range, high efficiency, better uniformity and stability. A light emitting device is obtained by incorporating the phosphor into a UV, purple or blue light emitting device.
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Citations
28 Claims
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1-12. -12. (canceled)
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13. A phosphor comprising rare earth, silicon, alkaline-earth metal, halogen, and oxygen, as well as aluminum or gallium, wherein
the rare earth is at least one metal element selected from a group consisting of Sc, Y, La, Pr, Nd, Gd, Ho, Yb and Sm as well as at least one metal element selected from a group consisting of Ce, Eu and Tb; -
the alkaline-earth metal is at least one metal element selected from a group consisting of Mg, Ca, Sr and Ba; and the halogen is at least one element selected from F and Cl. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A light emitting device comprising:
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a phosphor; and a semiconductor light emitting element capable of emitting a light in the range from ultraviolet light to visible light, wherein the phosphor contains rare earth, silicon, alkaline-earth metal, halogen, and oxygen, as well as aluminum or gallium; the rare earth is at least one metal element selected from a group consisting of Sc, Y, La, Pr, Nd, Gd, Ho, Yb and Sm as well as at least one metal element selected from a group consisting of Ce, Eu and Tb; the alkaline-earth metal is at least one metal element selected from a group consisting of Mg, Ca, Sr and Ba; and the halogen is at least one element selected from F and Cl. - View Dependent Claims (27, 28)
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Specification