Alpha barium zinc cadmium sulfide phosphors and method
First Claim
1. A phosphor having an alpha crystal structure isostructural with Ba2 MnS3 and the chemical composition
wherein A is an activator element selected from the group consisting of manganese, europium, cerium, lead and terbium, y is a numerical value in the range from 0 to 1, z is a numerical value in the range from 0 to 20, and w is a numerical value in the range from 0.00001 to 0.1.
A.sub.w .sup.. zZnS
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Abstract
New phosphors which may be activated to luminesce in the red to green portion of the spectrum have an alpha crystal structure isostructural with Ba2 MnS3 and the composition
Ba.sub.2 Zn.sub.1.sub.-y Cd.sub.y S.sub.3 : A.sub.w.sup.. zZnS
wherein A is an activator element selected from the group consisting of manganese, europium, cerium, lead and terbium, y is a numerical value in the range from 0 to 1, z is a numerical value in the range from 0 to 20, and w is a numerical value in the range from 0.00001 to 0.1. Methods of making these phosphors are described.
15 Citations
9 Claims
- 1. A phosphor having an alpha crystal structure isostructural with Ba2 MnS3 and the chemical composition
- space="preserve" listing-type="equation">Ba.sub.2 Zn.sub.1.sup.-y Cd.sub.y S.sub.3 ;
A.sub.w .sup.. zZnS
wherein A is an activator element selected from the group consisting of manganese, europium, cerium, lead and terbium, y is a numerical value in the range from 0 to 1, z is a numerical value in the range from 0 to 20, and w is a numerical value in the range from 0.00001 to 0.1. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- 3. A red-emitting alpha crystal structure phosphor according to claim 2 wherein y is 0.
- 4. A red-emitting alpha crystal structure phosphor according to claim 1 having the chemical composition
- space="preserve" listing-type="equation">Ba.sub.2 Zn.sub.1.sup.-y Cd.sub.y S.sub.3 ;
Eu.sub.w .sup.. zZnS
- space="preserve" listing-type="equation">Ba.sub.2 Zn.sub.1.sup.-y Cd.sub.y S.sub.3 ;
- space="preserve" listing-type="equation">Ba.sub.2 Zn.sub.1.sup.-y Cd.sub.y S.sub.3 ;
Ce.sub.w .sup.. zZnS
- space="preserve" listing-type="equation">Ba.sub.2 Zn.sub.1.sup.-y Cd.sub.y S.sub.3 ;
Tb.sub.w .sup.. zZnS
- space="preserve" listing-type="equation">Ba.sub.2 Zn.sub.1.sup.-y Cd.sub.y S.sub.3 ;
Pb.sub.w .sup.. zZnS
- 8. The method of making an alpha crystal structure phosphor composition that is isostructural with Ba2 MnS3 which comprises preparing a mixture of a host compound comprising
- space="preserve" listing-type="equation">alpha Ba.sub.2 Zn.sub.1.sup.-y Cd.sub.y S.sub.3,
wherein y is a numerical value from 0 to 1, and an activator compound selected from the class consisting of carbonates, oxides, nitrates, sulfates, acetates, halides and sulfides of an activator element selected from the class consisting of manganese, europium, cerium, lead and terbium, in proportions of one atom part host compound to an amount of activator compound containing from 0.00001 to 0.1 atom part activator element, heating such mixture in a non-oxidizing atmosphere at a temperature in the range from 600°
to 1000°
C. for a time between 0.5 and 30 hours, and then cooling the product to room temperature.- View Dependent Claims (9)
Specification
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- Resources
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Current AssigneeUnited States Radium Corporation
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Original AssigneeUnited States Radium Corporation
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InventorsTecotzky, Melvin, Fan, Albert K.
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Primary Examiner(s)Cooper, Jack
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Application NumberUS05/637,840Time in Patent Office229 DaysField of Search252/301.6 SUS Class Current252/301.60SCPC Class CodesC09K 11/0816 with alkaline earth metalsC09K 11/565 with zinc cadmium
