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US 6,555,021 B2Granted
Preparation of ZnS:Cu,Cl electroluminescent phosphor
AssigneeOsram Sylvania Inc.
InventorsButchi Reddy Vaddi, Shellie K. Northrop
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Abstract
A process for improving the half-life of ZnS:Cu,Cl electroluminescent phosphor wherein the improvement comprises firing a previously first fired material comprised of ZnS:Cu,Cl with a quantity of MgSO4.7H2O to form a second fired material. The quantity is from 0.015 to 0.15 mole of MgSO4.7H2O/mole of ZnS.
Claims4
A process for improving the half-life of ZnS:Cu,Cl electroluminescent phosphor wherein the improvement comprises firing a first fired material comprised of ZnS:Cu,Cl with a quantity of MgSO4.7H2O to form a second fired material, said quantity being from 0.015 to 0.15 mole of MgSO4.7H2O mole of ZnS.
Dependencies are inferred from the claim text.