κΉλν
2017-11-02T01:14:08Z
2017-11-02T01:14:08Z
2016-01
OPTICS EXPRESS, v. 24, NO 2, Page. 350-357
1094-4087
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-2-A350
http://hdl.handle.net/20.500.11754/30415
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
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2013R1A2A1A01016467).
en
OPTICAL SOC AMER
LUMINESCENT SOLAR CONCENTRATORS
LIGHT-EMITTING DEVICES
ENERGY-TRANSFER
NANOCRYSTALS
CDSE
EFFICIENCY
CONVERSION
EMISSION
DIODES
LAYER
Microstructural and optical properties of CdSe/CdS/ZnS core-shell-shell quantum dots
Article
2
24
10.1364/OE.24.00A350
350-357
OPTICS EXPRESS
Lee, Dea Uk
Kim, Dae Hun
Choi, Dong Hyuk
Kim, Sang Wook
Lee, Hong Seok
Yoo, Keon-Ho
Kim, Tae Whan
2016001383
S
RESEARCH INSTITUTE[S]
RESEARCH INSTITUTE OF INFORMATION DISPLAY
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