Title :
Synthesis and characterisation of ZnS:Cu and ZnS:Cu/CdS core/shell nanocrystals via a water-soluble route
Author :
Xin Tian ; Lixin Cao ; Wei Liu ; Ge Su ; Bohua Dong
Author_Institution :
Inst. of Mater. Sci. & Eng., Ocean Univ. of China, Qingdao, China
fDate :
7/1/2012 12:00:00 AM
Abstract :
The authors report the synthesis and characterisation of high-quality colloidal nanocrystals (NCs) consisting of ZnS:Cu cores coated with CdS shells. The ZnS:Cu/CdS core/shell NCs are characterised by X-ray diffraction, transmission electron microscopy (TEM), photoluminescence (PL) spectra and UV-vis spectra. From the TEM, it can be seen that the obtained NCs are uniform spherical-shaped particles and the average particles size increased from 2 to 3.5 nm with the shell growth. The PL emission intensity of core/shell NCs was found to be dependent on the shell thickness and the emission peak position was shifted from 480 to 610 nm with the CdS shell coating. These NCs can be a promising candidate for application as a commercial phosphor material.
Keywords :
II-VI semiconductors; X-ray diffraction; cadmium compounds; coatings; colloids; copper; nanofabrication; nanoparticles; photoluminescence; semiconductor growth; transmission electron microscopy; ultraviolet spectra; visible spectra; wide band gap semiconductors; zinc compounds; TEM; UV-visible spectra; X-ray diffraction; ZnS:Cu; ZnS:Cu-CdS; core-shell nanocrystals; high-quality colloidal nanocrystals; particles size; photoluminescence emission intensity; photoluminescence spectra; shell coating; shell growth; shell thickness; transmission electron microscopy; uniform spherical-shaped particles; water-soluble route;
Journal_Title :
Micro & Nano Letters, IET
DOI :
10.1049/mnl.2012.0313
