Temperature dependence of the direct gaps of ZnSe andZn0.56Cd0.44Se

We have measured the temperature dependence of the spectral features of the direct gaps of ZnSe and ${\mathrm{Zn}}_{0.56}$ ${\mathrm{Cd}}_{0.44}$Se in the temperature range 25 K<T<400 K using contactless electroreflectance. The parameters that describe the temperature variation of the energy (including thermal expansion effects) and broadening function of the band gaps have been evaluated. © 1996 The American Physical Society.