Accession Number : AD0713181

Title :   LUMINESCENCE STUDY OF EXCITON-EXCITON INTERACTION IN CADMIUM SULFIDE, CADMIUM SELENIDE, AND ZINC OXIDE.

Descriptive Note : Doctoral thesis,

Corporate Author : CORNELL UNIV ITHACA N Y MATERIALS SCIENCE CENTER

Personal Author(s) : Magde,Mchael Douglas

Report Date : JUN 1970

Pagination or Media Count : 140

Abstract : The thesis reports the results of an experimental study of luminescence in several 2-6 semiconducting compounds at excitation levels, provided by laser pulses, of 1 Kw/sq cm to 5 Mw/sq cm. Under such conditions an additional luminescence band appears which is not observed when luminescence is excited by much lower intensity conventional mercury lamps. The additional emission was observed in two different types of CdS as well as in CdSe and ZnO. In each case it increased at a rate faster than linear, becoming prominent in the range 10 - 100 kW/sq cm whereas luminescence attributed to bound excitons increased linearly with excitation intensity at first, but eventually, in all cases except ZnO, appeared to saturate. A kinetic treatment of the model yields the following value for the cross section for this process: 10 to the 16th power/sq cm. (Author)

Descriptors :   (*SEMICONDUCTORS, *LUMINESCENCE), (*CADMIUM SULFIDES, EXCITONS), (*CADMIUM SELENIDES, EXCITONS), BAND THEORY OF SOLIDS, ZINC COMPOUNDS, EXCITATION, PHONONS, CRYOGENICS, LASERS, OXIDES, THESES

Subject Categories : Optics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE