Abstract
Deep-ultraviolet (deep-UV) light emissions from nonpolar (10-10) M-plane AlxGa1−xN/AlyGa1−yN multiple quantum wells (MQWs) were studied by photoluminescence spectroscopy. The nonpolar M-plane AlGaN MQWs showed shorter emission wavelength than the polar (0001) C-plane ones, mainly because of the absence of the quantum-confined Stark effect. The deep-UV light emissions from the M-plane AlGaN MQWs showed stronger polarization with electric field E parallel to the c-axis (E||c) than the C-plane ones. The different polarization properties between the M- and C-plane AlGaN MQWs can be explained in terms of in-plane lattice strain and anisotropy of the effective hole mass.
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