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Low temperature PL spectra of undoped, Mg-doped, and Be-doped AlN epilayers measured in (a) a broad spectral range from and (b) a narrower spectral range from .
Temperature dependence of the transition on Be-doped AlN epilayers measured from .
Arrhenius plot of the PL intensity [ vs ] in Be-doped AlN epilayers in the temperature range from . We have excluded the PL intensity at because of the overlap of the peak position with 3LO phonon of excitation laser. The solid line represents the least squares fit of the data with Eq. (1).
Temporal responses of the transition in (a) Mg- and (b) Be-doped AlN epilayers measured at . The measured decay lifetimes were 119 and for Mg- and Be-doped AlN epilayers, respectively.
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