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
- 김태환
- 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/20.500.11754/30411
- ISSN
- 1094-4087
- DOI
- 10.1364/OE.24.00A350
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
- Files in This Item:
- Microstructural and optical properties of CdSe CdS ZnS core-shell-shell quantum dots.pdfDownload
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