Binderless storage phosphor screen
View Patent ↗An image storage screen or panel, suitable for use in applications related with computed radiography comprises, on a support, a binderless needle-shaped stimulable CsBr:Eu phosphor layer, wherein, besides low amounts of a europium activator or dopant in favor of homogeneous distribution of said activator in the CsBr matrix, presence of well-defined amounts of rubidium halide and cesium chloride in said matrix, and, optionally, further presence of alkali metal, alkaline earth metal and/or metal earth salts, and/or, optionally, other metal salts or oxides, provides a remarkable speed increase, without loss in sharpness.
1. A photostimulable phosphor panel comprising a photostimulable phosphor according to the formula (1)
CsBr (1-z-αa) .RbBr z :aEu (1),
wherein
5×10 −3 mol/mol<z<1.5×10 −1 mol/mol,
0<a<5×10 −4 mol/mol and wherein 2≦α<3.
2. A photostimulable phosphor panel according to claim 1 , wherein in the formula (1)
1×10 −4 mol/mol<z<1.5×10 −1 mol/mol and wherein
0<a<2×10 −4 mol/mol.
3. A photostimulable phosphor panel according to claim 2 , wherein said phosphor additionally contains at least one compound comprising Ta, W, Ti or Mo in an amount of 10 p.p.m. to 1,000 p.p.m. (μmol/mol) versus CsBr.
4. A photostimulable phosphor panel according to claim 3 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
5. A photostimulable phosphor panel according to claim 3 , wherein europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
6. A photostimulable phosphor panel according to claim 3 , wherein europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
7. A photostimulable phosphor panel according to claim 2 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
8. A photostimulable phosphor panel according to claim 2 , wherein in the formula (1) europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
9. A photostimulable phosphor panel according to claim 2 , wherein in the formula (1) europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
10. A photostimulable phosphor panel according to claim 1 , wherein said phosphor additionally contains at least one compound comprising Ta, W, Ti or Mo in an amount of 10 p.p.m. to 1,000 p.p.m. (μmol/mol) versus CsBr.
11. A photostimulable phosphor panel according to claim 10 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
12. A photostimulable phosphor panel according to claim 10 , wherein europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
13. A photostimulable phosphor panel according to claim 10 , wherein europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
14. A photostimulable phosphor panel according to claim 1 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
15. A photostimulable phosphor panel according to claim 1 , wherein in the formula (1) europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
16. A photostimulable phosphor panel according to claim 1 , wherein in the formula (1) europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
17. A photostimulable phosphor panel comprising a photostimulable phosphor according the formula (2)
Cs (1-z-αa) Rb z Br (1-y) Cl y :aEu (2)
wherein
5×10 −3 mol/mol<z<1.5×10 −1 mol/mol;
6×10 −5 mol/mol<y<1.5×10 −2 mol/mol;
0<a<1×10 −3 mol/mol and wherein 2≦α<3.
18. A photostimulable phosphor panel according to claim 17 , wherein in the formula (2)
1×10 −4 mol/mol<z<1.5×10 −1 mol/mol and wherein
0<a<5×10 −4 mol/mol.
19. A photostimulable phosphor panel according to claim 18 , wherein said phosphor additionally contains at least one compound comprising Ta, W, Ti or Mo in an amount of 10 p.p.m. to 1,000 p.p.m. (μmol/mol) versus CsBr.
20. A photostimulable phosphor panel according to claim 19 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
21. A photostimulable phosphor panel according to claim 19 , wherein europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
22. A photostimulable phosphor panel according to claim 19 , wherein europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
23. A photostimulable phosphor panel according to claim 18 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
24. A photostimulable phosphor panel according to claim 18 , wherein in the formula (2) europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
25. A photostimulable phosphor panel according to claim 18 , wherein in the formula (2) europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
26. A photostimulable phosphor panel according to claim 17 , wherein said phosphor additionally contains at least one compound comprising Ta, W, Ti or Mo in an amount of 10 p.p.m. to 1,000 p.p.m. (μmol/mol) versus CsBr.
27. A photostimulable phosphor panel according to claim 26 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
28. A photostimulable phosphor panel according to claim 26 , wherein europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
29. A photostimulable phosphor panel according to claim 26 , wherein europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
30. A photostimulable phosphor panel according to claim 17 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
31. A photostimulable phosphor panel according to claim 17 , wherein in the formula (2) europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
32. A photostimulable phosphor panel according to claim 17 , wherein in the formula (2) europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
33. A photostimulable phosphor panel comprising a photostimulable phosphor according the formula (1′)
CsBr (1-z-αa-βx) .RbBr z :aEu.xTa (1′),
wherein
1×10 −5 mol/mol<x<1×10 −4 mol/mol;
1×10 −4 mol/mol<z<1.5×10 −1 mol/mol;
0<a<0.2 mol/mol; and wherein 2≦α<3 and 2<β≦5.
34. A photostimulable phosphor panel according to claim 33 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
35. A photostimulable phosphor panel according to claim 33 , wherein in the formula (1′) europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
36. A photostimulable phosphor panel according to claim 33 , wherein in the formula (1′) europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.
37. A photostimulable phosphor panel comprising a photostimulable phosphor according the formula (2′)
Cs (1-z-αa-βx) Rb z Br (1-y) Cl y :aEu.xTa (2′), wherein
1×10 −5 mol/mol<x<1×10 −4 mol/mol;
6×10 −4 mol/mol<y<1.5×10 −2 mol/mol;
1×10 −4 mol/mol<z<1.5×10 −1 mol/mol,
0<a<0.2 mol/mol;
and wherein 2≦α<3 and 2<β≦5.
38. A photostimulable phosphor panel according to claim 37 , wherein metals selected from the group consisting of Li, Na, K, Tl, Ca, Ba, Pb, Ni, Cr, Cu, Fe and Bi are additionally present.
39. A photostimulable phosphor panel according to claim 37 , wherein in the formula (2′) europium is present in an amount in the range between 40 and 500 p.p.m. (μmol/mol) vs. CsBr.
40. A photostimulable phosphor panel according to claim 37 , wherein in the formula (2′) europium is present in an amount in the range between 40 and 200 p.p.m. (μmol/mol) vs. CsBr.