Microstructural and optical properties of CdSe/CdS/ZnS core-shell-shell quantum dots

Title
Microstructural and optical properties of CdSe/CdS/ZnS core-shell-shell quantum dots
Author
김대훈
Keywords
LUMINESCENT SOLAR CONCENTRATORS; LIGHT-EMITTING DEVICES; ENERGY-TRANSFER; NANOCRYSTALS; CDSE; EFFICIENCY; CONVERSION; EMISSION; DIODES; LAYER
Issue Date
2016-01
Publisher
OPTICAL SOC AMER
Citation
OPTICS EXPRESS, v. 24, NO 2, Page. 350-357
Abstract
CdSe/CdS/ZnS core-shell-shell quantum dots (QDs) were synthesized by using a solution process. High-resolution transmission electron microscopy images and energy dispersive spectroscopy profiles confirmed that stoichiometric CdSe/CdS/ZnS core-shell-shell QDs were formed. Ultraviolet-visible absorption and photoluminescence (PL) spectra of CdSe/CdS/ZnS core-shell-shell QDs showed the dominant excitonic transitions from the ground electronic subband to the ground hole subband (1S(e)-1S(3/2)(h)). The PL mechanism is suggested; the carriers generated by the exciting high-energy photons in the shell region are relaxed to the band-edge states of the core region and recombined to emit lower-energy photons. The activation energy of the carriers confined in the CdSe/CdS/ZnS core-shell-shell QDs, as obtained from temperature-dependent PL spectra, was 200 meV. The quantum efficiency of the CdSe/CdS/ZnS core-shell-shell QDs at 300 K was estimated to be approximately 57%. (C)2015 Optical Society of America
URI
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-2-A350http://hdl.handle.net/20.500.11754/30415
ISSN
1094-4087
DOI
10.1364/OE.24.00A350
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