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US 6,103,296 AGranted
Method for improving the screen brightness of gadolinium oxysulfide x-ray phosphors
AssigneeOsram Sylvania Inc.
InventorRobert T. McSweeney
Life of this patent
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Abstract
A method is provided for improving the x-ray screen brightness of gadolinium oxysulfide x-ray phosphors. The method applies annealing and acid washing steps in a specific order following deagglomeration of the phosphor in order to ameliorate the loss of brightness caused by the deagglomeration.
Claims12
A method for improving the screen brightness of deagglomerated gadolinium oxysulfide x-ray phosphors comprising:
- annealing the deagglomerated phosphor at a temperature from about 400.degree. C. to about 800.degree. C. for a time from about 1 hour to about 4 hours;
- and
- acid washing the phosphor in a dilute acid having a pH of between about 1 to about 2 at a temperature from about 50.degree. C. to about 80.degree. C. for about 0.5 hours to about 2 hours.
A method for improving the screen brightness of deagglomerated gadolinium oxysulfide x-ray phosphors comprising:
- annealing the deagglomerated phosphor at a temperature and for a time sufficient to increase brightness;
- and
- acid washing the phosphor in a dilute acid solution to remove phosphor particles having a particle size of less than about 1 .mu.m.
Dependencies are inferred from the claim text.