Abstract
AbstractTime‐resolved photoluminescence spectra of biexcitons confined in CuCl quantum dots embedded in a NaCl matrix have been measured by an optical Kerr gate method. Ultrashort pulsed emission was observed for resonant two‐photon excitation of the biexcitons. The peak intensity of this pulsed emission depended on the fourth power of the excitation density, which indicates that the superfluorescence originates from coherently coupled excited quantum dots. The photon energy of this pulsed emission increased with increasing excitation density. This implies that the superfluorescence efficiently depends on the dot size because biexcitons are directly generated by resonant two‐photon excitation for an ensemble of quantum dots with a size distribution (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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