In this paper, electroluminescence (EL) characteristic study of gallium arsenide junction is reported. The spectral range for which EL spectra were recorded is . Three main structures noted ,  and , located respectively at   and  are shown on the spectra. The phonon replica of  is shown and other sequence of transitions separated approximately by   is also observed. The electron-phonon coupling strength as well as the Franck-Condon shift of ( and  are extracted from the configuration coordinate model and temperature–dependence of linewidths and EL intensity. The  and  structures are due respectively to shallow donor-acceptor pair  and its phonon replica related to .