| 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) |
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| ABSTRACT |
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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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