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Title: A facile route to synthesize CdZnSe core–shell-like alloyed quantum dots via cation exchange reaction in aqueous system

Highlights: • Water-soluble CdZnSe alloyed QDs synthesized by cation exchange reaction. • The as-prepared CdZnSe QDs have fairly good luminescence properties. • The surface defects of obtained QDs were removed due to the alloyed structure. - Abstract: Water-soluble CdZnSe alloyed nanocrystals have been successfully prepared via “green” cation exchange reaction in aqueous system. The X-ray diffraction (XRD) patterns indicate that the as-prepared nanocrystals had high crystallinity and small particle size of 4–5 nm. The absorption spectra of CdZnSe show red shift of 100 nm from 375 to 475 nm. Moreover, the band-gap photoluminescent (PL) emission has a red shift of 50 nm from 430 to 480 nm with the increase of the reaction time. On the basis of the PL properties and transmission electron microscopy (TEM) images, one kind of core–shell-like structure model was proposed, which resulted from the different cation exchange reaction rates. This structure could greatly improve the luminescence properties by the removal of surface defect of quantum dots. This work would support potential applications in optoelectronic devices, and biomedical tags fields.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3]
  1. Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000 (China)
  2. (China)
  3. College of Materials and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160 (China)
Publication Date:
OSTI Identifier:
22420546
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 57; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTRA; CADMIUM COMPOUNDS; EMISSION SPECTRA; ENERGY GAP; ION EXCHANGE; OPTICAL PROPERTIES; OPTOELECTRONIC DEVICES; PARTICLE SIZE; PHOTOLUMINESCENCE; QUANTUM DOTS; RED SHIFT; SEMICONDUCTOR MATERIALS; SURFACES; TRANSMISSION ELECTRON MICROSCOPY; WATER; X-RAY DIFFRACTION; ZINC SELENIDES