Uncovering Forbidden Optical Transitions in PbSe Nanocrystals

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Jeffrey J. Peterson; Libai Huang; Christophe Delerue; Guy Allan; Todd D. Krauss

2007

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  • The 1Sh,e−1Pe,h exciton transition energy of PbSe nanocrystals was determined via two-photon photoluminescence excitation spectroscopy and was found to be in good agreement with predictions from a tight-binding calculation
  • The two-photon excitation peak occurs at energies very close to a strong feature in the one-photon absorption spectrum and suggests that it should be assigned as a formally forbidden S−P transition
  • Leading explanations for the unusual strength of the forbidden transition are discussed

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