SIZE-DEPENDENT 2-PHOTON EXCITATION SPECTROSCOPY OF CDSE NANOCRYSTALS

Authors
SCHMIDT ME BLANTON SA HINES MA GUYOTSIONNEST P
Citation
Me. Schmidt et al., SIZE-DEPENDENT 2-PHOTON EXCITATION SPECTROSCOPY OF CDSE NANOCRYSTALS, Physical review. B, Condensed matter, 53(19), 1996, pp. 12629-12632
Citations number
31
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
53
Issue
19
Year of publication
1996
Pages
12629 - 12632
Database
ISI
SICI code
0163-1829(1996)53:19<12629:S2ESOC>2.0.ZU;2-V
Abstract
Two-photon excitation spectra of highly monodisperse colloidal CdSe na nocrystals with sizes ranging from 22 to 43 Angstrom are compared to o ne-photon excitation data and to a spherically confined effective-mass model. The main experimental features are well described by this mode l. However, the first one-photon and two-photon transitions appear ind istinguishable, though the model predicts a 20-meV splitting. This dis crepancy may reflect the sensitivity of the band-edge structure to dev iations from the assumed spherical symmetry.