Publication
Title
Two-fold emission from the S-shell of PbSe/CdSe core/shell quantum dots
Author
Abstract
The optical properties of PbSe/CdSe core/shell quantum dots with core sizes smaller than 4 nm in the 5300 K range are reported. The photoluminescence spectra show two peaks, which become increasingly separated in energy as the core diameter is reduced below 4 nm. It is shown that these peaks are due to intrinsic exciton transitions in each quantum dot, rather than emission from different quantum dot sub-ensembles. Most likely, the energy separation between the peaks is due to inter-valley coupling between the L-points of PbSe. The temperature dependence of the relative intensities of the peaks implies that the two emitting states are not in thermal equilibrium and that dark exciton states must play an important role.
Language
English
Source (journal)
Small. - Weinheim
Publication
Weinheim : 2011
ISSN
1613-6810
Volume/pages
7:24(2011), p. 3493-3501
ISI
000298298300012
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 20.02.2012
Last edited 05.11.2017
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