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PL spectra of alloy measured from .
The temperature dependence of the excitonic emission peak energy between 10 and for different . The solid lines are the least-squares fit of the data with the Varshni equation, Eq. (1). Deviations from Eq. (1) at the lowest measurement temperatures are the measures of the exciton localization energies, .
Variations of the (a) exciton localization energy , (b) thermal activation energy , and (c) full width at half maximum of the PL emission line with Al content in alloys. , , and all increase with for , decrease with for , and have a maximum at . [The solid curve in (c) is a calculation result of Eq. (3)].
(a) Exciton localization energy as a function of the thermal activation energy of the localized exciton in AlGaN alloys. Solid line is a linear fit with a slope of 1. (b) Measured full width at half maximum of the localized exciton emission line as a function of in AlGaN alloys. Solid line is a linear fit with a slope of 0.4.
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