In this paper we shall demonstrate the use of intermixing inmodify of GaAs/AlGaAs quantum-well. The paper shows that proton implantation can achievelarge energy shifts after standard annealing procedures. The PL and photoresponse spectrumwere measured as a function of ion dose in the range 5×1014/cm-2 to 2.5×1015/cm-2/, the peakphotoresponse wavelength was tunable between 8.4μm to 10.2μm andPL peak from 780nm to 850nm.