Microstructural and optical properties of CdSe/CdS/ZnS core-shell-shell quantum dotsopen access
- Authors
- Lee, Dea Uk; Kim, Dae Hun; Choi, Dong Hyuk; Kim, Sang Wook; Lee, Hong Seok; Yoo, Keon-Ho; Kim, Tae Whan
- Issue Date
- Jan-2016
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS EXPRESS, v.24, no.2, pp.A350 - A357
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTICS EXPRESS
- Volume
- 24
- Number
- 2
- Start Page
- A350
- End Page
- A357
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24715
- DOI
- 10.1364/OE.24.00A350
- ISSN
- 1094-4087
- 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%.
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