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Single‐Source Precursor Route for Synthesis of High‐Quality Green‐emitting Quantum Dots and Their Hydrophilic Surface Modification
Author(s) -
Wang Sheng,
Lv Yanbing,
Wu Ruili,
Li Lin Song,
Shen Huaibin,
Xing Ming,
Chen Xia
Publication year - 2017
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.11154
Subject(s) - photoluminescence , quantum dot , materials science , monolayer , dispersity , chemical engineering , nanotechnology , optoelectronics , polymer chemistry , engineering
The high‐quality green‐emitting CdS 0 . 5 Se 0 .5 / 8Zn 1 − 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 Zn 1− 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 CdS 0 . 5 Se 0 .5 core and ZnS shell. Moreover, the Zn 1− 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 CdS 0 . 5 Se 0 .5 / 8Zn 1 − 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 CdS 0 . 5 Se 0 .5 / 8Zn 1 − x Cd x S / 2ZnS core/shell QDs may be good candidates for applications of biomedical and photoelectric field.