The radiation produced by the direct recombination of electrons and holes in germanium is studied. The observed spectral distribution is in fair agreement with theory. For injection into high resistivity, as well as into doped material, the radiation is observed to be a linear function of injection current. Possible explanations for this are discussed. Magnetic concentration of carriers produced changes in the radiation intensity. Polarization of the radiation at oblique angles of emergence is observed.
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Roger H. Newman (1953) studied this question.
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