Threshold for quasicontinuum absorption and reduced luminescence efficiency in CdSe nanocrystals

作者：Werner Hoheisel, Vicki L. Colvin, Christopher S. Johnson, A. Paul Alivisatos · 发表于：The Journal of Chemical Physics · 年份：1994 · DOI：10.1063/1.468107 · 被引用次数：157 · 研究领域：Quantum Dots Synthesis And Properties、Chalcogenide Semiconductor Thin Films、Nanocluster Synthesis and Applications

Luminescence excitation spectra are employed to study the electronic states of CdSe nanocrystals ranging in size from 9 to 26 Å radius at 77 K. These studies show that all samples have, in addition to the discrete manifold of quantum confined electronic excitations, a threshold for continuum absorption. Absorption into this continuum results in substantially reduced luminescence efficiency.