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http://dx.doi.org/10.4191/kcers.2015.52.2.146

Optical Properties of PbS Quantum Dots (QDs) Precipitated in Nd3+-Containing Glasses  

Park, Won Ji (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
Heo, Jong (Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH))
Publication Information
Journal of the Korean Ceramic Society / v.52, no.2, 2015 , pp. 146-149 More about this Journal
Abstract
Silicate glasses with different $Nd_2O_3$ concentrations were prepared through conventional melt-quenching methods while PbS quantum dots (QDs) were precipitated through heat treatment. The peak wavelengths of absorption and the photoluminescence of PbS QDs shifted to the short-wavelength side as the concentration of $Nd_2O_3$ increased. The electron energy loss spectroscopy (EELS) indicated that $Nd^{3+}$ ions were preferentially distributed inside the PbS QDs instead of the glass matrix. In addition, there was no significant change in the lifetimes of the $Nd^{3+}:^4F_{3/2}$ fluorescence between the as-prepared glass ($607{\mu}s$) and the heat-treated glass($576{\mu}s$). $Nd^{3+}$ ions were surrounded by oxygen instead of sulfur and the Nd-O clusters probably acted as nucleating centers for the formation of PbS QDs inside the glasses.
Keywords
Quantum dots; Rare-earth ions; Optical properties;
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