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Photoluminescence properties of intra-well exciton migration in Zn1−xCdxSe quantum wells by P. Dı́az-Arencibia; I. Hernández-Calderón; L.M. Hernández-Ramı́rez; M.C. Tamargo is a Engineering article available to read on EtoBox.

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We report the results of the investigation of the temperature dependence and the nature of the spontaneous excitonic emission of Zn 1Ϫx Cd x Se QWs. The spectra are dominated by two main peaks, which show a strong change in relative intensities with temperature. The presence in the spectra of biexcitons and bound excitons was ruled out after the corresponding analyses. Calculation of the fundamental transitions of the QWs indicated that the peaks were due to thickness fluctuations of 1 and 2 monomolecular layers. The changes in the relative intensities of the two peaks in the photoluminescence spectra with temperature are attributed to exciton migration between QW regions differing in thickness one or two monomolecular layers (ML). The measured activation energy necessary for exciton migration, in order to establish thermal equilibrium as temperature increases, coincides with the energy difference of the exciton ground state of QWs with 1-2 ML thickness difference. The successful analysis of the spectra in terms of a simple two-level model indicated that localization of excitons due to QW thickness fluctuations and exciton migration are basic processes which have strong influence i

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Author

P. Dı́az-Arencibia; I. Hernández-Calderón; L.M. Hernández-Ramı́rez; M.C. Tamargo

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd; Elsevier BV (ISSN 0026-2692)

Published

2000

Language

EN

Field

Engineering (Physical Sciences)