  Inelastic light scattering spectra of Bi_2Se_3 and Sb_2Te_3 single crystals
have been measured over the temperature range from 5 K to 300 K. The
temperature dependence of dominant A^{2}_{1g} phonons shows similar behavior in
both materials. The temperature dependence of the peak position and linewidth
is analyzed considering the anharmonic decay of optical phonons and the
material thermal expansion. This work suggests that Raman spectroscopy can be
used for thermometry in Bi_2Se_3- and Sb_2Te_3-based devices in a wide
temperature range.
