Binderless storage phosphor screen with needle shaped crystals
AssigneeAgfa-Gevaert
InventorsErich Hell, Manfred Fuchs, Detlef Mattern, Bernhard Schmitt, Paul Leblans
Life of this patent
Estimating the term…
Abstract
A binderless storage phosphor screen with needle shaped crystals, wherein the phosphor is an alkalihalide phosphor and the needles show high [100] unit cell orientation in the plane of the screen.
Claims9
Method for producing a binderless CsBr:Eu storage phosphor screen comprising steps of:
- combining CsBr and EuOBr as phosphor precursors for an alkali metal storage phosphor;
- and
- vacuum depositing said combination of phosphor precursors on a substrate, wherein during said step of vacuum depositing said substrate is kept at a temperature T, such that 50° C.≦T≦300° C. and said vacuum deposition proceeds in an Ar-atmosphere with an Ar-pressure of at most 3 Pa;
- and
- wherein said storage phosphor screen shows an XRD-spectrum with a (100) diffraction line having an intensity I100 and a (110) diffraction line having an intensity I110, so that I100/I110≧1, when said XRD-spectrum is measured according to TEST A.
A method of making a binderless CsBr:Eu storage phosphor screen comprising an alkali metal storage phosphor wherein said screen shows an XRD-spectrum with a (100) diffraction line having an intensity I100 and a (110) diffraction line having an intensity I110, so that I100/I110≧1, when said XRD-spectrum is measured according to TEST A, said method comprising applying binderless phosphor to a support by a method selected from the group consisting of physical vapor deposition, thermal vapor deposition, chemical vapor deposition, electron beam deposition, radio frequency deposition, and pulsed laser deposition;
- wherein said CsBr:Eu phosphor is made by:
- preparing a mixture by combining CsBr with between 10−3 and 5 mol % of EuOBr,
- firing said mixture at a temperature above 450° C.,
- cooling said mixture, and
- recovering the CsBr:Eu phosphor from said mixture;
- wherein the binderless phosphor is vacuum deposited in an inert gas atmosphere of argon gas at a pressure of less than 3.0 Pa, and a support temperature of from 50° C. to 300° C.
A method of making a binderless CsBr:Eu storage phosphor screen comprising an alkali metal storage phosphor wherein said screen shows an XRD-spectrum with a (100) diffraction line having an intensity I100 and a (110) diffraction line having an intensity I110, so that I100/I110≧1, when said XRD-spectrum is measured according to TEST A, said method comprising applying binderless phosphor to a support by a method selected from the group consisting of physical vapor deposition, thermal vapor deposition, chemical vapor deposition, electron beam deposition, radio frequency deposition, and pulsed laser deposition;
- wherein the binderless phosphor is vacuum deposited in an inert gas atmosphere of argon gas at a pressure of less than 3.0 Pa, and a support temperature of more than 90° C. and up to 200° C., wherein said method of making said screen further comprises:
- preparing a mixture by combining CsBr with between 10−3 and 5 mol % of EuOBr,
- bringing said mixture into condition for vapor deposition, and
- depositing said mixture on said support.
A method of making a binderless CsBr:Eu storage phosphor screen comprising an alkali metal storage phosphor wherein said screen shows an XRD-spectrum with a (100) diffraction line having an intensity I100 and a (110) diffraction line having an intensity I110, so that I100/I110≧5, when said XRD-spectrum is measured according to TEST A, said method comprising applying binderless phosphor to a support by a method selected from the group consisting of physical vapor deposition, thermal vapor deposition, chemical vapor deposition, electron beam deposition, radio frequency deposition, and pulsed laser deposition;
- wherein the binderless phosphor is vacuum deposited in an inert gas atmosphere of argon gas at a pressure of less than 3.0 Pa, and a support temperature of more than 90° C. and up to 200° C.;
- and wherein said CsBr:Eu phosphor is made by a method comprising:
- preparing a mixture by combining CsBr with between 10−3 and 5 mol % of EuOBr,
- firing said mixture at a temperature above 450° C.,
- cooling said mixture, and
- recovering said CsBr:Eu phosphor from said mixture.
A method of making a binderless CsBr:Eu storage phosphor screen comprising an alkali metal storage phosphor wherein said screen shows an XRD-spectrum with a (100) diffraction line having an intensity I100 and a (110) diffraction line having an intensity I110, so that I100/I110≧5, when said XRD-spectrum is measured according to TEST A, said method comprising applying binderless phosphor to a support by a method selected from the group consisting of physical vapor deposition, thermal vapor deposition, chemical vapor deposition, electron beam deposition, radio frequency deposition, and pulsed laser deposition;
- wherein the binderless phosphor is vacuum deposited in an inert gas atmosphere of argon gas at a pressure of less than 3.0 Pa, and a support temperature of more than 90° C. and up to 200° C.;
- and wherein said method of making said screen further comprises:
- preparing a mixture by combining CsBr with between 10−3 and 5 mol % of EuOBr,
- bringing said mixture into condition for vapor deposition, and
- depositing said mixture on said support.
Dependencies are inferred from the claim text.