Blue electroluminescence has been observed in GaN when the energy supplied to each electron is more than $48kT$ below the energy of the emitted photons. The emission increases with the cube of the current. An external power efficiency of 3 ×{} 10^-4 was obtained. Several excitation mechanisms by two hot electrons are considered.
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J. I. Pánkové (1975) studied this question.
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