Mn2+ activated green emitting SrAI12O19 luminescent material
OwnerAlok Mani Srivastava, Holly Ann Comanzo +2inventors
InventorsAlok Mani Srivastava, Holly Ann Comanzo, Douglas Allen Doughty, William Winder Beers
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Abstract
A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+ , Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.
Claims42
A composition of matter, comprising:
- AD12O19:Mn,R
- wherein A comprises at least one of strontium, barium and calcium;
- D comprises at least one of aluminum, boron, gallium and magnesium;
- and
- R comprises at least one trivalent rare earth ion.
A luminescent device, comprising:
- a housing;
- a source of energetic media contained in said housing;
- and
- a luminescent material contained in the interior of the housing, comprising:
- AD12O19:Mn,R
- wherein A comprises at least one of strontium, barium and calcium;
- D comprises at least one of aluminum, boron, gallium and magnesium;
- and
- R comprises at least one trivalent rare earth ion.
A method of making a phosphor, comprising the steps of:
- mixing oxide, carbonate, hydroxide, nitrate or oxalate compounds of strontium, aluminum, manganese, and at least one of gallium, barium, calcium, boron, magnesium, cerium, praseodymium, gadolinium and terbium;
- and
- heating a resulting mixture to form the phosphor.
A method of making a scintillator, comprising the steps of:
- placing a single crystal seed in contact with a melt comprising strontium, aluminum, oxygen, manganese and at least one of magnesium, gallium, barium, calcium, boron, cerium, praseodymium, gadolinium and terbium;
- moving the seed from a high temperature zone to a low temperature zone;
- and
- forming a single crystal scintillator in contact with the seed.
Dependencies are inferred from the claim text.