1993/01/01 by A. I. Ekimov, I. A. Kudryavtsev, Al. L. Éfros +6 · 3 citations
Materials Science · Engineering · #Quantum Dots Synthesis And Properties #Chalcogenide Semiconductor Thin Films #Copper-based nanomaterials and applications
paper · doi:10.1364/josab.10.000100
openalex publication_date 1993/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
CdSe is used as a prototype to show the implications of valence-band degeneracy for the optical properties of strongly quantum-confined nanocrystals. Absorption spectra and photoluminescence spectra obtained under intermediate and strong pulsed excitation show the presence of new structures. The energy levels for the electron and the hole are calculated with the spherical confinement, the nonparabolicity of the conduction band, and the valence band degeneracy taken into account. The oscillator strengths of the dipole-allowed transitions are also calculated. This model is found to be in good agreement with the experimental observations, which originate mainly from the quantization of the energy spectrum of holes with due account given to valence-band degeneracy.