Figure 2

Photoluminescence spectra of a modulation doped GaN/AlGaN QW with different excitation photon energies, as indicated by the arrows. The topmost spectrum was excited with 3.72 eV photons. The three middle peaks originate from emissions in the QW. The energetically lowest emission is from the GaN buffer layer, and the highest energy emission originates from the AlGaN barrier.

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