Radiative recombination spectra of Hg0.5Cd0.5Se in the temperature range 11?110 K at different excitation power were investigated. A blue shift in the photoluminescence spectra that exposes the peculiarities of the electronic band structure of these alloys was observed. This phenomena could be associated to an atypical radiative recombination process in which high energetic photons have a higher probability of emission than low energetic ones. Furthermore, photoreflectance and optical absorption measured at 300K showed a higher value for band gap than suggested by photoluminescence at low temperature. A slight differance was observed between the values of the band gap obtained from optical absorption and photoreflectance.