InP polycrystals grown by the HB technique and InP single crystals grown by the liquid-encapsulated Czochralski technique have been evaluated by photoluminescence. It was found that as the carrier concentration is decreased, the photoluminescence spectrum shows finer structures. When the carrier concentration is less than 9×1014 cm−3, a strong free-exciton peak could be observed.
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Inoue et al. (1990) studied this question.
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