The electroluminescence (EL) spectra from Fe∕AlGaAs(n)∕GaAs∕AlGaAs(p) spin LEDs contain an e₁h₁ excitonic feature; in addition, they exhibit new features not present in the photoluminescence (PL) spectra, that are ``satellites'' or ``replicas'' of the exciton. These satellites are red shifted with respect to e₁h₁ by energies that are approximately equal to those of zone edge phonons in GaAs. The intensity of the replicas depends strongly on bias voltage. In the presence of a magnetic field the satellites become circularly polarized as σ₊ but their polarization is always lower than that of e₁h₁. The satellites are interpreted as due to recombination processes that involve zone edge electrons that tunnel into the GaAs quantum well. These processes occur simultaneously with the emission of zone-edge phonons. Our interpretation is supported by a numerical simulation of the properties of electrons tunneling through an Fe∕GaAs(n) Schottky barrier.
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Mallory et al. (2006) studied this question.
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