The optical polarization of AlN/AlxGa1-xN single quantum wells (x = 0.65) has been studied by means of photoluminescence (PL) spectroscopy. The predominant polarization component of the band-edge PL switched from E ∥ c to E ⊥ c at a well width around 2 nm. The emission intensity with polarization of E ⊥ c and the degree of polarization were found to decrease with increasing well width. The emission intensity with polarization of E ∥ c was found to increase with increasing well width.
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Tahtamouni et al. (2012) studied this question.
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