Accession Number : AD0737910

Title :   Luminescence of CdSe and CdS and the Influence of Defects.

Descriptive Note : Doctoral thesis,

Corporate Author : ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Personal Author(s) : Arora,Brij Mohan

Report Date : JAN 1972

Pagination or Media Count : 181

Abstract : Spontaneous luminescence of 'pure' CdSe and CdS at low temperature, excited by mercury lamp, shows a number of peaks attributed to bound exciton and free exciton recombination mechanisms. Temperature dependence (6K to 80K) of various emission lines has been determined to characterize the transition mechanisms responsible for them. Stimulated emission of a number of CdSe platelets has been studied as function of exciton intensity and temperature by using Ga(As,P) pulsed laser diode as pump. These results indicate that there is no unique origin of the stimulated emission at low temperatures. A number of transition mechanisms, involving free and bound excitons, simultaneously compete and generate stimulated emission dependent on the level of excitation and the platelet being excited. Several of the stimulated peaks appear to be correlated to the spontaneous lines resulting from bound exciton transitions accompanied by emission of an LO phonon. (Author)

Descriptors :   (*SEMICONDUCTORS, OPTICAL PUMPING), (*CADMIUM SELENIDES, LUMINESCENCE), (*CADMIUM SULFIDES, LUMINESCENCE), LASERS, BAND THEORY OF SOLIDS, DEFECTS(MATERIALS), NEUTRON REACTIONS, PHOTOCONDUCTIVITY, EMISSIVITY, PHONONS, ATOMIC ENERGY LEVELS, ELECTRON TRANSITIONS, THESES

Subject Categories : Lasers and Masers
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE