We have fabricated p-type crystalline silicon/porous silicon/microcrystalline silicon carbon pn junction diodes and demonstrated current-induced visible light emission. We observed two kinds of electroluminescence; one was a weak white emission at a forward current of about 90 mA, and the other was a strong orange-red one at a forward current from about 200 to 619 mA.
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Futagi et al. (1992) studied this question.
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