Abstract
XRD and TEM characterisation evidenced the formation of well-dispersed CdS nanoparticles inside a phosphate glass matrix. Optical absorption and time-resolved photoluminescence study were carried out on the prepared glass samples. Optical absorption revealed the fast character of the growth of CdS nanoparticles in this medium. Photoluminescence spectra showed only one large band with a maximum at almost 740 nm, which was associated to transitions between energy levels within the bandgap of the CdS nanoparticles. From the steady state and time-resolved measurements, it was suggested that the emission comes mainly from sulfur vacancies inside the nanocrystals and on its surface, which act as deep traps for the photogenerated electrons. The creation of such vacancies was attributed to the loss of sulfur during the glass preparation as evidenced from a chemical analysis using energy dispersive X-ray spectrometry. These traps may be also induced by the fast growth of CdS nanocrystals in this matrix or laser exposure during PL measurements. These CdS-doped glasses with an intense absorption in the UV–Vis region and a large emission band with long lifetime and a large Stokes-shift are adequate for luminescent solar concentrators, photocatalytic applications and solid-state lasers.
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Acknowledgements
The author would like to acknowledge Professors B. Champagnon and G. Panczer, Laboratoire de Physico-Chimie des Matériaux Luminescents, UMR 5620 CNRS, 12 Rue Ampère, Université Lyon 1, Villeurbanne, 69622 (France) for PL measurements facility.
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Haouari, M., Saad, N. On the Origin of the Large Stokes-Shift of the Emission of CdS Nanoparticles Embedded in a Phosphate Glass Matrix. J Clust Sci 29, 391–402 (2018). https://doi.org/10.1007/s10876-017-1322-x
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DOI: https://doi.org/10.1007/s10876-017-1322-x