Electroluminescent ZnS:Mn phosphor and method of making
AssigneeGlobal Tungsten & Powders Corp.
InventorsXianzhong Chen, Shellie Kaye Northrop, Chen-Wen Fan
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Abstract
An electroluminescent phosphor comprising ZnS:Mn is disclosed. Also disclosed are ZnS:Mn electroluminescent phosphors that are free of or substantially free of copper, and/or wherein the phosphor has a D50 size of less than about 5 μm. In addition, a method for preparing a ZnS:Mn phosphor is disclosed, comprising the steps of contacting at least a portion of each of a first solution comprising a Zn2+ compound, a manganese source, and a second solution comprising a S2− source agent; and then heating the mixture at a temperature and for a time sufficient to form a phosphor.
Claims7
A method for preparing a ZnS:Mn phosphor comprising the steps of:
- (a) contacting at least a portion of a first solution comprising a zinc salt and Mn2+with a second solution comprising sodium sulfide to produce a particle, washing and drying the particle, and mixing the dried precipitate with sodium chloride and a manganese compound;
- and then
- (b) heating the particle at a high temperature in air and for a time sufficient to form an orange-yellow emitting phosphor;
- wherein no copper is present in any of the first solution, the second solution, or the manganese source.
Dependencies are inferred from the claim text.