Accession Number : AD0274948

Title :   INVESTIGATION OF CARRIER INJECTION ELECTROLUMINESCENCE

Corporate Author : RADIO CORP OF AMERICA LANCASTER PA INDUSTRIAL TUBE AND SEMICONDUCTOR DIV

Personal Author(s) : FISCHER,A.G. ; MASON,A.S.

Report Date : 15 FEB 1962

Pagination or Media Count : 1

Abstract : A study was made of carrier injection electroluminescence. It was found that electroluminescence in ZnS-type powders occurs in the interior of the particles and is confined to sharp lines of various shape. The brightness of single lines rises exponentially with voltage and becomes linear at highest voltages. Light is emitted at that end of a line which is pointed towards the electrode becoming positive. Existing theories are shown to be insufficient. A new model based on alternating bipolar field-emission from conducting imperfection lines in insulators with traps was developed and compared with experience. Good agreement with most experimental facts is demonstrated. The brightness of single lines (100,000 ft-lamberts) should be obtainable in larger areas with dc injection EL in single crystals since the working mechanism is similar. New insights were gained into the mechanism of depreciation of EL cells. The particle-sizedependence of brightness can be explained. Contact-, dc-and photoelectroluminescence can be interpreted under one common viewpoint. (Author)

Descriptors :   *LUMINESCENCE, *PHOSPHORESCENT MATERIALS, *SINGLE CRYSTALS, *ZINC COMPOUNDS, CRYSTALS, FIELD EMISSION, MICROSCOPY, PARTICLES, PHOTOELECTRIC EFFECT, POWDERS, SOLID STATE PHYSICS, SULFIDES

Distribution Statement : APPROVED FOR PUBLIC RELEASE