Effect of dopant concentration and the role of ZnS shell on optical properties of Sm3+ doped CdS quantum dots.
| Title: | Effect of dopant concentration and the role of ZnS shell on optical properties of Sm3+ doped CdS quantum dots. |
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| Authors: | Vinh ND; Faculty of Chemistry, TNU - University of Sciences Thai Nguyen Vietnam.; Tan PM; Faculty of Fundamental Sciences, Thai Nguyen University of Technology Thai Nguyen Vietnam.; Do PV; Thuyloi University 175 Tay Son, Dong Da Hanoi Vietnam.; Bharti S; Panjab University Chandigarh 160014 India.; Hoa VX; Faculty of Physics and Technology, TNU - University of Sciences Thai Nguyen Vietnam canx@tnus.edu.vn.; Hien NT; Faculty of Physics and Technology, TNU - University of Sciences Thai Nguyen Vietnam canx@tnus.edu.vn.; Luyen NT; Faculty of Physics and Technology, TNU - University of Sciences Thai Nguyen Vietnam canx@tnus.edu.vn.; Ca NX; Faculty of Physics and Technology, TNU - University of Sciences Thai Nguyen Vietnam canx@tnus.edu.vn. |
| Source: | RSC advances [RSC Adv] 2021 Feb 18; Vol. 11 (14), pp. 7961-7971. Date of Electronic Publication: 2021 Feb 18 (Print Publication: 2021). |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: Royal Society of Chemistry Country of Publication: England NLM ID: 101581657 Publication Model: eCollection Cited Medium: Internet ISSN: 2046-2069 (Electronic) Linking ISSN: 20462069 NLM ISO Abbreviation: RSC Adv Subsets: PubMed not MEDLINE |
| Imprint Name(s): | Original Publication: Cambridge [England] : Royal Society of Chemistry, [2011]- |
| Abstract: | The role of samarium (Sm) dopant on the structural, morphological, and optical properties of CdS QDs and CdS/ZnS core/shell QDs was methodically reported. The synthesis of Sm-doped CdS QDs and CdS/ZnS QDs was carried out via a facile wet chemical method. The structure, chemical composition, and optical properties of the synthesized QDs were investigated by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (RS), and photoluminescence (PL) spectroscopy. XRD analysis showed that the synthesized CdS QDs exhibited zinc blende structure which was not affected by doping Sm3+ ions. The particle size of the CdS:Sm and CdS:Sm (2%)/ZnS QDs was estimated to be ∼4 nm and ∼7 nm, respectively. Transmission electron microscopy (TEM) images revealed that the incorporation of Sm dopant did not significantly affect the size and morphology of CdS QDs, while the formation of the ZnS shell increased the particle size. XPS and XRD results confirmed the successful incorporation of Sm3+ ions into the CdS QDs. The effect of dopant concentration on the structural and luminescent properties was studied. The emission and excitation spectra of Sm3+-doped CdS QDs and CdS/ZnS QDs consisted of the characteristic lines corresponding to the intra-configurational f-f transitions. The energy transfer (ET) mechanism from the host to Sm3+ ions and the ET process through cross-relaxation between Sm3+ ions have been elucidated. The effect of the ZnS shell on the optical stability of the Sm3+-doped CdS QDs was studied in detail and the results showed that the CdS:Sm (2%)/ZnS QDs retained their good emission characteristics after 376 days of fabrication. The luminescent properties of Sm-doped QDs ranging from violet to red and PL lifetime extending to milliseconds demonstrated that these QDs are the potential materials for applications in white LEDs, biomarkers, and photocatalysis.; (This journal is © The Royal Society of Chemistry.) |
| Competing Interests: | There are no conflicts to declare. |
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| Entry Date(s): | Date Created: 20220415 Latest Revision: 20231108 |
| Update Code: | 20260130 |
| PubMed Central ID: | PMC8695085 |
| DOI: | 10.1039/d0ra08056j |
| PMID: | 35423296 |
| Database: | MEDLINE |
Journal Article