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- Title
Single-Source Precursor Route for Synthesis of High-Quality Green-emitting Quantum Dots and Their Hydrophilic Surface Modification.
- Authors
Wang, Sheng; Lv, Yanbing; Wu, Ruili; Li, Lin Song; Shen, Huaibin; Xing, Ming; Chen, Xia
- Abstract
The high-quality green-emitting CdS0.5Se0.5/ 8Zn1−x Cd x S/ 2ZnS QDs with '8' and '2' monolayers ( ML) of corresponding shell were first synthesized by 'thermal-cycling coupled single precursor' ( TC-SP) approach. The component-gradient Zn1−x Cd x S interlayer played a key role in the growth of thick shell by gradually buffering the large lattice mismatch (~9%) between the CdS0.5Se0.5 core and ZnS shell. Moreover, the Zn1−x Cd x S gradient interlayer as well as ZnS outshell increased the potential barrier to prevent excitons from being trapped by surface defects. The photoluminescence quantum yields of the as-synthesized CdS0.5Se0.5/ 8Zn1−x Cd x S/ 2ZnS core/shell QDs can reach to 70% in organic media and still maintain 60% after aqueous phase transfer. The green-emitting CdS0.5Se0.5/ 8Zn1−x Cd x S/ 2ZnS core/shell QDs may be good candidates for applications of biomedical and photoelectric field.
- Subjects
CHEMICAL precursors; QUANTUM dots; HYDROPHILIC surfaces; HYDROPHILIC interactions; THERMOCYCLING
- Publication
Bulletin of the Korean Chemical Society, 2017, Vol 38, Issue 7, p700
- ISSN
0253-2964
- Publication type
Article
- DOI
10.1002/bkcs.11154