The low-energy electronic states of PbSe quantum dots are investigated using photoluminescence spectroscopies. Size-selective photoluminescence measurements produce unexpectedly broad (~500.3em0exmeV) emission lines. In addition, significant anti-Stokes luminescence is observed. Finally, we observe a size-dependent splitting of the lowest emission feature. Possible origins of the broad emission lines observed despite size-selective excitation and the splitting of the emission spectrum will be discussed.
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Harbold et al. (2007) studied this question.
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