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J. Korean Ceram. Soc. > Volume 52(2); 2015 > Article
Journal of the Korean Ceramic Society 2015;52(2): 146.
doi: https://doi.org/10.4191/kcers.2015.52.2.146
Optical Properties of PbS Quantum Dots (QDs) Precipitated in Nd3+-Containing Glasses
Won Ji Park, Jong Heo1
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)
1Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH)
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.
Key words: Quantum dots, Rare-earth ions, Optical properties
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