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In gallium phosphide, chromium doping allows the excitation of donor-acceptor type luminescence with light whose energy is smaller than the band gap and smaller than the emitted light energy. We discuss the behavior of that emission as a function of the excitation power together with electron paramagnetic resonance results. We conclude that the deep level involved is associated with Cr2+, located 1, 2 eV below the X conduction-band minimum. The up-conversion power efficiency of this sample is also reported.
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Clerjaud et al. (1981) studied this question.
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