Back to results
US 8,877,096 B2Granted
Near infrared doped phosphors having a zinc, germanium, gallate matrix
AssigneeUniversity of Georgia Research Foundation, Inc.
InventorsZhengwei Pan, Yi-Ying Lu
Life of this patent
Estimating the term…
Abstract
Phosphors based on transition metal-activated gallates, particularly Cr3+- and Ni2+-activated zinc germanium gallates, are disclosed herein. In some embodiments such phosphors can exhibit persistent infrared phosphorescence for as long as 400 hours. Such phosphors can be used, for example, as components of a luminescent paint.
Claims20
A phosphor comprising a material of the formula:
- ZnxGayGezO(x+(3y/2)+2z):tC,mR
- wherein a portion of Ga may optionally be replaced with a Group IIIA metal;
- wherein a portion or all of Ge may optionally be replaced with a Group IVA metal;
- and
- wherein C is Cr3+, Ni2+, or a combination thereof;
- R is an ion selected from a group consisting of alkaline earth ions, lanthanide ions, Li+ ions, and combinations thereof;
- x is 3;
- y is 2;
- z is 1 to 5;
- t is 0.01 to 5 and represents mol % based on the total moles of Ga and any replacements thereof;
- and
- m is 0 to 5 and represents mol % based on the total moles of Ga and any replacements thereof,
- wherein the phosphor has at least one emission band in the near infrared.
10 more elements
Dependencies are inferred from the claim text.