Zp. Su et al., SELENIUM MOLECULES AND THEIR POSSIBLE ROLE IN DEEP EMISSION FROM GLASSES DOPED WITH SELENIDE NANOCRYSTALS, Journal of applied physics, 80(2), 1996, pp. 1054-1057
We report the observation of Raman scattering from a vibration mode wi
th frequency of 320 cm(-1) and its higher-order harmonics in silicate
glasses doped with selenide semiconductor nanocrystals such as CdSe an
d ZnSe. Comparison with Raman spectra of glasses and alkali halides do
ped with Se suggests that these modes are caused by the presence or se
lenium molecules in the glasses; When excited in the blue and. green b
y an Ar+ laser, glasses containing Se only are found to emit strong ne
ar-infrared luminescence whose peak and Line shape are very similar to
the so-called ''deep emission'' observed frequently from selenide-dop
ed glasses. Possible effects of Se molecules on the linear and nonline
ar optical properties of glasses containing selenide nanocrystals are
discussed. (C) 1996 American Institute of Physics.