Accession Number:

AD0272786

Title:

IMPROVED RED ELECTROLUMINESCENT PHOSPHORS

Descriptive Note:

Corporate Author:

WESTINGHOUSE ELECTRIC CORP BLOOMFIELD N J

Personal Author(s):

Report Date:

1961-12-01

Pagination or Media Count:

1.0

Abstract:

A large number of elements were tried for their possible effect as activators of red emission in ZnS. Considerable effort was given to the ZnSCu,Tl, ZnSCu,Li,Ti, and ZnSCu,Fe,I systems, all of which showed some potential as red emitters. A development possibly leading to an improved red electroluminescent phosphor was that of treatment of hexagonal Zn,CdSCu,I phosphors in I vapor. The best phosphors of the desired color made in this way had a quantum efficiency about 25 of that of conventional green-emitting cubic ZnSCu,Cl phosphors and a brightness about one-third that of a cubic Zn,Cd,HgSCu, In phosphor. The best red-emitting electroluminescent phosphor known therefore was still Zn,Cd,HgSCu. As a result of improvements in plastic dielectrics for embedding the phosphor and in voltage breakdown protection by use of layers containing BaTiO3, considerably higher brightness was obtained. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE