Injection mechanisms responsible for the electroluminescence in GaAs diffused diodes are studied by examining the behavior of the emission peaks as a function of injection level, doping level, temperature, and depletion-layer widths. Three different injection mechanisms seem to be operative in providing radiation at near-band-gap energies. Models for two of these are proposed and tested. The nature of the third emission remains an open question.

• Received 25 September 1964

DOI:https://doi.org/10.1103/PhysRev.137.A1583