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US 2012/0256126 A1Published application
Persistent phosphors of alkaline earths modified by halides and 3d ions
AssigneePerformance Indicator, LLC
InventorWeiyi Jia
Life of this patent
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Abstract
Phosphorescent compositions including silicate of alkaline earth materials which are modified by at least one halide are provided. The phosphorescent compositions may include 3d ions. A variety of embodiments may be realized. The appearance of some embodiments may be glassy (i.e., vitreous).
Claims9
A phosphorescent silicate-halide composition, according to the general formula:
- (n−x)MO.xM′X2.(1−k)MgO.kMgX2. 2SiO2:yEu,zR,wD
- where
- M is at least one of Sr, Ca, and Ba;
- M′ is at least one of Sr, Ca and Ba;
- X is at least one of F and Cl;
- R is at least one of Dy3+, Nd3+, and optionally comprises at least one rare earth selected from the group of ions comprising La, Ce, Pr, Sm, Gd, Tb, Ho, Er, Tm, Yb, Y and Lu;
- D is at least one 3d ion selected from the group comprising Ti, V, Cr, Mn, Fe, Co, Ni, Cu;
- n ranges from 0.9 to 3.2;
- x ranges from 0.0001 to 0.7;
- k ranges from 0.0001 to 1.0;
- y ranges from 0.0001 to 0.1;
- z ranges from 0.0001 to 0.1;
- and
- w ranges from 0.0001 to 0.02.
11 more elements
A method for fabricating a glassy phosphorescent silicate-halide composition, the method comprising:
- mixing a composition according to the general formulae:
- (n−x)MO.xM′X2.(1−k)MgO.kMgX2. 2SiO2:yEu,zR,wD
- where
- M is at least one of Sr, Ca, and Ba;
- M′ is at least one of Sr, Ca and Ba;
- X is at least one of F and Cl;
- R is at least one of Dy3+, Nd3+, and optionally comprises at least one rare earth selected from the group of ions comprising La, Ce, Pr, Sm, Gd, Tb, Ho, Er, Tm, Y, Yb, and Lu;
- D is at least one 3d ion selected from the group comprising Ti, V, Cr, Mn, Fe, Co, Ni, Cu;
- n ranges from 0.9 to 3.2;
- x ranges from 0.0001 to 0.7;
- k ranges from 0.0001 to 1.0;
- y ranges from 0.0001 to 0.1;
- z ranges from 0.0001 to 0.1;
- w ranges from 0.0001 to 0.02;
- sintering the mixture at a temperature from about 850 degrees Celsius to about 1,400 degrees Celsius;
- and
- finishing the composition at a temperature that is elevated about 50 degrees Celsius to about 100 degrees Celsius above the sintering temperature.
14 more elements
Dependencies are inferred from the claim text.