We report on UV photoluminescence (PL) dynamics in highly excited quaternary AlxInyGa1—x—yN epilayers and multiple quantum wells (MQWs). At low temperature, in MQWs we have observed new PL band which appeared at low excitation on the long-wave side of the spectrum and we show it to arise from localized carriers (excitons). The strong blue-shift of PL maximum with excitation intensity in MQWs is caused by localized state filling and screening of piezoelectric and spontaneous polarization electric field.
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Kuokštis et al. (2001) studied this question.
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