Optical spectra of ultrathin II-VI quantum wells

Fang Yang, B. Henderson, K.P. O'Donnell

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Ultrathin wide band gap II-VI quantum wells (QW's) feature a large inhomogeneous broadening of exciton transitions in the optical absorption and photoluminescence (PL) spectra. When the photon energy of the excitation laser approaches, or lies within the broadened PL band, a series of additional sharp peaks appear at low energy. The laser induced linear polarisation of the sharp peaks enables the clear demonstration of evenly spaced phonon-assisted transitions. The relative intensity of the phonon-assisted transitions and the mean phonon energy depend strongly on the photon energy of the exciting light. A new model of phonon-assisted relaxation between classically localized states explains these results well.

Original languageEnglish
Pages (from-to)687-691
Number of pages5
JournalSolid State Communications
Volume88
Issue number9
DOIs
Publication statusPublished - 1 Dec 1993

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Keywords

  • quantum wells
  • photoluminescence
  • optical absorption

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