By tuning the optimal conditions to obtain intersubband population inversion for the radiative transitions in quantum wells, a systematic study of two strong coupled electron gases in an asymmetric double quantum well is presented. Intra‐and intersubband scattering rates are calculated for interface and confined phonon modes in order to determine the optimal intersubband energy separation for enhancement of fast depopulation scattering and reduction of parasitic nonradiative scattering. Calculations are made by using the Fermi gold rule and also a self‐energy many body method, they are compared with reported 3D phonon in the same structures. The tunneling process between two dimensional strong coupled electrons gases in a double quantum well is followed an analyzed along the anticrossing. This geometry range allows a very interesting process of emission of coherent THz radiation, which has been detected after simultaneous population of the two anticrossing subbands. While intrasubband LO‐phonon scattering rates show a phonon bottle neck effect, intersubband scattering rates turn out to be a very efficient mechanism to tune a population inversion.