Accession Number : AD0272786

Title :   IMPROVED RED ELECTROLUMINESCENT PHOSPHORS

Corporate Author : WESTINGHOUSE ELECTRIC CORP BLOOMFIELD N J

Personal Author(s) : IVEY,H.F.

Report Date : DEC 1961

Pagination or Media Count : 1

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 ZnS:Cu,Tl, ZnS:Cu,Li,Ti, and ZnS:Cu,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,Cd)S:Cu,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 ZnS:Cu,Cl phosphors and a brightness about one-third that of a cubic (Zn,Cd,Hg)S:Cu, In phosphor. The best red-emitting electroluminescent phosphor known therefore was still (Zn,Cd,Hg)S:Cu. 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)

Descriptors :   *COMPLEX COMPOUNDS, *LUMINESCENCE, *PHOSPHORESCENT MATERIALS, *SULFIDES, *ZINC COMPOUNDS, ALUMINUM COMPOUNDS, CADMIUM COMPOUNDS, COLORS, COPPER COMPOUNDS, DIELECTRICS, EXCITATION, IMPREGNATION, IODIDES, IRON COMPOUNDS, LITHIUM COMPOUNDS, MERCURY COMPOUNDS, OXYGEN COMPOUNDS, PHOTOELECTRIC EFFECT, PIGMENTS, PLASTICS, THALLIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE