Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
594362 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2012 | 6 Pages |
Quasi-monodispersed CdxZn1−xS nanocrystals were prepared in a solvothermal process and characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersion X-ray analysis (EDX), UV–vis diffuse reflectance absorption spectra and photoluminescence spectra. The results showed that the uniform CdxZn1−xS nanocrystals with narrow size distribution could be obtained using laurylamine as solvent; and the mean diameter was 2.8 nm. Meanwhile, it was also found that the band gap energies and the fluorescence emission peaks of as-prepared CdxZn1−xS nanocrystals systematically shifted to shorter wavelength with increasing Zn content. The Cd0.5Zn0.5S nanocrystals can exhibit obviously upconversion emission due to two-photon excitation. In addition, the preparation and properties of CdxZn1−xS nanocrystals were studied as functions of reaction time and reaction temperature, respectively.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Quasi-monodispersed CdxZn1−xS nanocrystals were prepared in a solvothermal process. ► The emission systematically shifts to shorter wavelength with increasing Zn content. ► The Cd0.5Zn0.5S nanocrystals obtained can exhibit obviously upconversion emission.