The luminescence properties of the colloidal GaAs and CdS semiconductor quantum dots

✍ Scribed by A. Lalayan; A. Avetisyan; A. Djotyan

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 100 KB
• Volume: 2
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200410138

✦ Synopsis

The colloidal QDs of GaAs and CdS semiconductors with
the radiuses about 20Å and 30Å correspondingly have been
formed by laser ablation method in the liquid media. The optical
absorption and the photoluminescence spectra of the GaAs and CdS
colloidal QDs have been investigated experimentally and
theoretically. The considerable blue shift of the
photoluminescence connected with the size effects has been
registered. The theoretical analysis of the optical properties has
been performed on the basis of the quantum-mechanical
consideration of the electron-hole system in the spherical QD in
the effective mass approximation. The influence of the surface
charge of the QD and of impurity centers on the absorption edge
and on the luminescence properties is discussed.