Date of Award

Spring 1979

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Physics

Abstract

The luminescence spectra of CdS single crystals have been widely investigated. However, many transitions, observed at 77°K, remain unidentified. This dissertation is therefore mainly concerned with an experimental investigation of these energetic emissions and the identification of the observed transitions insofar as possible. Prepared crystals were excited by ultraviolet light at liquid nitrogen temperature and the luminescence spectra observed using a half meter grating spectrograph. Spectra were recorded both photographically and directly using a photomultiplier tube and strip chart recorder. The photographic plates were analyzed using a densitometer. A brief backgreund in band theory is given in chapter I. Chapter II reports the general description of luminescence of CdS and a presentation of several energy models used to explain this phenomenon is also given here. Chapter III presents the data of the luminescence spectra observed at 77°K. An energy level model is proposed to account for these spectral lines. This model is an adaptation of more detailed models proposed for emission at liquid helium temperature.

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