Photoluminescence (PL) and electroluminescence (EL) measurements on GaAs in the spectral range 0.75 to 1.4 ev are performed at 93 K. The influence of arsenic and gallium ion implantations on the luminescence in this region is examined and the role of impurities like Cu, O, Si is studied. Some suggestions relative to the nature of defect centers responsible for the emission in this region are presented.