کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
594362 | 1453975 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Preparation of quasi-monodispersed CdxZn1−xS nanocrystals and their optical properties Preparation of quasi-monodispersed CdxZn1−xS nanocrystals and their optical properties](/preview/png/594362.png)
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.
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► 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.
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 398, 20 March 2012, Pages 48–53