PbTe quantum dots formation in a novel germanate glass

• PbTe QDs were precipitated in a novel germanate glass matrix through thermal treatment.
• PbTe QDs size increased from 3.3 to 5.9 nm with the increasing in the annealing temperature.
• The band gap energy Eopt. has been increased with decrease in the QD size.
• These new materials will find application in telecommunications and fiberoptic communications.

The formation of PbTe quantum dots (QDs) in a novel germanate glass matrix is investigated. The QDs were characterized by optical absorption, X-ray diffraction (XRD) and transmission electron microscope (TEM). The dependence of the size of PbTe QDs on the heat-treatment temperature is identified. We have found that PbTe QDs size increase from 3.3 to 5.9 nm with the increasing in the annealing temperature. X-ray measurements showed a formation of PbTeO3 layer at the interface between the surface of the nanoparticles and the host glass matrix.