Longitudinal-optical-phonon-assisted energy relaxation in self-assembled CdS quantum dots embedded in ZnSe

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概要

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• The energy relaxation processes of CdS self-assembled quantum dots (QDs) embedded in ZnSewere investigated. Longitudinal-optical (LO)-phonon resonant structures were discerned in thephotoluminescence spectra under the CdS selective excitation, especially under nearly resonantexcitation conditions. Strong energy selectivity among the Gaussian distributed energy levels of theQDs are observed in energy relaxation processes, in which excitons are dominantly injected into theQDs whose ground state energies with respect to the excitation energy are equal to themulti-LO-phonon energy of ZnSe. Detection-energy dependent photoluminescence excitation (PLE)measurements also suggest that the coupling strength between the excitons and LO phonons isstrongly size-dependent, i.e., coupling is strongly enhanced in smaller QDs. In addition, type-II bandalignment of the CdS/ZnSe heterostructure is experimentally confirmed directly by PLEmeasurements.

• American Institute of Physicsの論文

著者

• Suemune I

  Hokkaido Univ. Sapporo Jpn

• Kumano H

  Hokkaido Univ. Sapporo Jpn

関連論文

• Longitudinal-optical-phonon-assisted energy relaxation in self-assembled CdS quantum dots embedded in ZnSe

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