Photoluminescence study of ZnCdSe/ZnSe quantum dot systems

J. R. Lee, C. R. Lu, C. H. You, J. Y. Jen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The optical properties of the populated ZnCdSe/ZnSe quantum dots have been studied by photoluminescence spectra measured with different laser excitation apertures at temperatures from 22 to 300 K. The differences of spectral features between small and large excitation spot suggest the existence of quantum dot size fluctuation in the system. The temperature evolution of photoluminescence spectral features revealed that two types of quantum dots with different densities and sizes coexist in ZnCdSe/ZnSe system. The energy spacings of the two kinds of quantum dot emissions are about 50 meV at various temperatures. The thermally activated lateral transfer processes of carriers populated in the two sorts of quantum dots are investigated by temperature dependences of spectral intensities.

Original languageEnglish
Pages (from-to)1920-1923
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume66
Issue number11
DOIs
Publication statusPublished - 2005 Nov 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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