초록 ▼

Disclosed herein are cerium doped, garnet phosphors emitting in the yellow region of the spectrum, and having the general formula (Y,A)3(Al,B)5(O,C)12:Ce3+, where A is Tb, Gd, Sm, La, Sr, Ba, Ca, and/or Mg, and substitutes for Y, B is Si, Ge, B, P, and/or Ga, and substitutes for Al, and C is F, Cl,

Disclosed herein are cerium doped, garnet phosphors emitting in the yellow region of the spectrum, and having the general formula (Y,A)3(Al,B)5(O,C)12:Ce3+, where A is Tb, Gd, Sm, La, Sr, Ba, Ca, and/or Mg, and substitutes for Y, B is Si, Ge, B, P, and/or Ga, and substitutes for Al, and C is F, Cl, N, and/or S, where C substitutes for O. Relative to a solid-state-reaction method, the instant co-precipitation methods provide a more homogeneous mixing environment to enhance the distribution of the Ce3+ activator in the YAG matrix. Such a uniform distribution has the benefit of an increased emission intensity. The primary particle size of the as-prepared phosphor is about 200 nm, with a narrow distribution.

대표청구항 ▼

1. A cerium-doped, garnet-based phosphor comprising yttrium, aluminum, silicon, and oxygen, wherein the phosphor is configured to absorb excitation radiation having a peak wavelength ranging from about 445 nm to about 460 nm, and to emit light having a peak emission wavelength ranging from about 530

1. A cerium-doped, garnet-based phosphor comprising yttrium, aluminum, silicon, and oxygen, wherein the phosphor is configured to absorb excitation radiation having a peak wavelength ranging from about 445 nm to about 460 nm, and to emit light having a peak emission wavelength ranging from about 530 nm to about 550 nm, wherein the phosphor further includes a halogen. 2. The cerium-doped, garnet-based phosphor of claim 1, wherein the phosphor is doped with about 3% silicon. 3. The cerium-doped, garnet-based phosphor of claim 1, wherein the phosphor is doped with about 5% silicon. 4. The cerium-doped, garnet-based phosphor of claim 1, wherein the phosphor is doped with about 8% silicon. 5. The cerium-doped, garnet-based phosphor of claim 1,wherein the silicon substitutes for aluminum in the range from about 3% to about 8%. 6. A cerium-doped, garnet-based phosphor comprising a compound having the formula Y3(Al1-xSix)5O12:Ce3+, where x ranges from about 0.03 to about 0.08, and wherein the phosphor is configured to emit light having a peak emission wavelength ranging from about 530 nm to about 550 nm, and wherein the phosphor further includes a halogen. 7. A cerium-doped, garnet-based phosphor comprising a compound having the formula Y3(Al1-xSix)5(O1-yCy)12:Ce3+, where C is at least one of F or Cl;x ranges from about 0.001 to about 0.2;y ranges from about 0.001 to 0.2; andwherein the phosphor is configured to emit light having a peak emission wavelength ranging from about 540 nm to about 560 nm. 8. The cerium-doped, garnet-based phosphor of claim 7, wherein C is F. 9. A method of producing a phosphor having the formula Y3(Al1-xSix)5O12:Ce3+, where x ranges from about 0.001 to about 0.2, and where the method comprises: 1) dissolving desired amounts of Ce(NO3)3•6H2O, Y(NO3)3•6H2O, Al(NO3)3•9H2O in de-ionized water to form a solution and adding a halogen containing compound to the solution;2) adding (CH3O)4Si to the solution resulting from step 1);3) adding the solution from step 2) to an ammonia solution in a dropwise manner;4) aging the solution of step 3) for about 1 hour, and then filtering and washing the resultant precipitant with distilled water;5) drying the precipitate of step 4) at about 150° C. for about 6 hours; and6) cooling and gently milling the dried precipitate of step 4), transferring this product to an alumina crucible, and sintering the milled product at about 1100° C. to 1500° C. in a reducing atmosphere. 10. A cerium-doped, garnet-based phosphor comprising a compound having the formula (Y,A)3(Al1-xGax)5(O,C)12:Ce3+, where x ranges from about 0.001 to 1.0, A is selected from the group consisting of Tb, Gd, Sm, La, Sr, Ba and Ca where A substitutes for Y in amounts ranging from about 0.1 to 100 percent, C is selected from the group consisting of F, Cl, N and S where C substitutes for O in amounts ranging from about 0.1 to 100 percent, and wherein the phosphor includes a halogen. 11. The cerium-doped, garnet-based phosphor of claim 10, wherein the phosphor further includes silicon. 12. A cerium-doped, garnet-based phosphor comprising yttrium, aluminum, fluorine, and oxygen, wherein the phosphor is configured to absorb excitation radiation having a peak wavelength ranging from about 445 nm to about 460 nm, and wherein the peak emission wavelength is blue-shifted about 25 nm with the inclusion of 8% fluorine relative to no fluorine. 13. A cerium-doped, garnet-based phosphor comprising yttrium, aluminum, chlorine, and oxygen, wherein the phosphor is configured to absorb excitation radiation having a peak wavelength ranging from about 445 nm to about 460 nm, and wherein the peak emission wavelength is blue-shifted about 5 to 8 nm with the inclusion of 8% chlorine relative to no chlorine.