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Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
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Title:
SPECTRAL DEPENDENCE OF THE PHOTOLUMINESCENCE OF CdS1-xSex NANOCRYSTALS EMBEDDED IN SILICATE GLASS
Creator:
L. Grigoryan ; M. Ghulinyan ; P. Petrosyan ; H. Petrosyan
Corporate Creators:
Yerevan State University (YSU) ; University of Tehran, North-Kargar Street, Tehran, Iran
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Abstract:
Semiconductor CdS1-xSex quantum dots embedded in a silicate glass matrix have attracted considerable attention over the last years because of their novel optical and dynamic properties associated with the quantum confinement effects [1-3]. The optical properties of silicate glasses containing semiconductor nanocrystals are controlled by the nanocrystal size and size distribution. Such an approach, to our opinion, is not satisfactory. The studies made by us show that during a heat treatment the final formation of the CdS1-xSex nanocrystal structure does not occur at once. At the first stage of the heat treatment, a formation of controlled structure takes place, but the crystal lattice is not completely formed at that stage. It takes the crystal lattice a long-term heat treatment to be completely formed. It is shown that the nucleus of crystal formed at a high temperature ( C) and subjected to further heat treatment at C during which the diffusion growth of the nucleus of crystal is missing, undergoes structural changes. These structural changes occurring during the heat treatment can affect the photoluminescence (PL) properties of the samples.
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