Transitions from spontaneous emission to stimulated emission and superfluorescence of biexcitons confined in CuCl quantum dots

L. Q. Phuong, Kensuke Miyajima, K. Maeno, T. Itoh, M. Ashida

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Abstract

Time-resolved photoluminescence spectra of biexcitons in CuCl quantum dots embedded in NaCl matrix have been measured by two configurations of optical Kerr gate method. As for a backward configuration, a transition from spontaneous to stimulated emission is observed with increase in the excitation density. On the other hand, by a configuration collecting signals from the edge of the sample in the direction of the excitation length, an essential change in the time profile of biexciton luminescence from a conventionally exponential to a pulse-shaped according to the increasing excitation density reasonably suggests a shift from spontaneous emission to superfluorescence of biexciton luminescence.

Original languageEnglish
Pages (from-to)77-80
Number of pages4
JournalJournal of Luminescence
Volume133
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Biexciton
  • CuCl quantum dot
  • Spontaneous emission
  • Stimulated emission
  • Superfluorescence
  • Time-resolved photoluminescence

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