Abstract

Semiconductor-doped glasses are currently under intensive investigation since they may provide a system with quantum confinement effects which enhance the optical nonlinearity. Recently, we prepared a Bi₂S₃ doped (about 0.8 wt%) glass in which the system K₂O-Na₂O- ZnO-B₂O₃-SiO₂ is employed as a matrix. In this paper, we show the experimental evidence of quantum confinement effects in the semi-conductor-doped glass. It has been found that the absorption spectra shifts to longer wave lengths with heat treatment temperature and time., due to the increase of microcrystalline size^[1] (such as in Fig. 1,2). The absorption edge shows a long tail, suggesting a broad distribution of particle size. The long tails results the difficult for determining the energy gaps of the doped Bi₂S₃. We assume the energy gaps are the edge position by interpolating the absorbance at zero.

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