Silicate-based yellow-green phosphors
First Claim
1. A silicate-based yellow-green phosphor having the formula A2SiO4:
- Eu2+D, wherein;
A is at least one of a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd; and
D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N, wherein D is present in the phosphor in an amount ranging from about 0.01 to 20 mole percent, and wherein at least some of the D dopant substitutes for oxygen anions to become incorporated into the crystal lattice of the silicate-based yellow-green phosphor.
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Abstract
Novel phosphor systems are disclosed having the formula A2SiO4:Eu2+D, where A is at least one of a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd; and D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N. In one embodiment, the novel phosphor has the formula (Sr1-x-yBaxMy)2 SiO4:Eu2+F (where M is one of Ca, Mg, Zn, or Cd in an amount ranging from 0<y<0.5). The phosphor is configured to absorb visible light from a blue LED, and luminescent light from the phosphor plus light from the blue LED may be combined to form white light. The novel phosphors can emit light at intensities greater than either conventionally known YAG compounds, or silicate-based phosphors that do not contain the inventive dopant ion.
149 Citations
21 Claims
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1. A silicate-based yellow-green phosphor having the formula A2SiO4:
- Eu2+D, wherein;
A is at least one of a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd; and D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N, wherein D is present in the phosphor in an amount ranging from about 0.01 to 20 mole percent, and wherein at least some of the D dopant substitutes for oxygen anions to become incorporated into the crystal lattice of the silicate-based yellow-green phosphor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- Eu2+D, wherein;
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14. A composition comprising:
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a silicate-based yellow phosphor having the formula A2SiO4;
Eu2+D, wherein A is at least one divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd; andD is a negatively changed halogen ion that is present in the yellow phosphor in an amount ranging from about 0.01 to 20 mole percent;
wherein at least some of the negativety charged halogen ions D sudstitute for oxygen anions to become incorporate into the crystal lattice of the silicate-base yellow phosphor, anda blue phosphor; wherein the yellow phosphor is configured to emit visible light with a peak intensity in a wavelength ranging from about 540 nm to 590 nm; and
the blue phosphor is configured to emit visible light with a peak intensity in a wavelength ranging from about 480 to 510 nm. - View Dependent Claims (15, 16, 17)
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18. A composition comprising:
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a silicate-based green phosphor having the formula A2SiO4;
Eu2+D, wherein A is at least one of a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd; and
D is a negatively charged halogen ion that is present in the yellow phosphor in an amount ranging from about 0.01 to 20 mole percent, wherein at least some of the negativety charged halogen ion D substituted for oxygen anions and thus are incorporated into the crystal lattice of the silicate-based green phosphor;a blue phosphor; and a red phosphor; wherein the green phosphor is configured to emit visible light with a peak intensity in a wavelength ranging from about 500 nm to 540 nm;
the blue phosphor is configured to emit visible light with a peak intensity in a wavelength ranging from about 480 to 510 nm; and
the red phosphor is configured to emit visible light with a peak intensity in a wavelength ranging from about 575 to 620 nm.
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19. A method of preparing a silicate-based yellow phosphor having the formula A2SiO4:
- Eu2+D, wherein A is at least one of a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd; and
D is a dopant selected from the group consisting of F, Cl, Br,and I, wherein D is present in the phosphor in an amount ranging from about 0.01 to 20 mole percent, the method comprising using a wet mixing step to incorporate at least some of the D dopant into the crystal lattice of the silicate-based yellow phosphor. - View Dependent Claims (20, 21)
- Eu2+D, wherein A is at least one of a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd; and
Specification