Abstract
Three AlxGa1-xN samples were grown by metal organic chemical vapor phase deposition(MOCVD),and their optical properties were analyzed by the steady-state and time-resolved photoluminescence(PL) techniques.In view of the fact that the experimental phenomena can't be fully explained by a single mechanism of polarization electric field or that of local state,which remarkably influence luminescent properties of nitrids,the competition mechanism between local state and internal polarization electric field was proposed.By analyzing the experimental data,two crucial conclusions are drawn.First,the temperature starting point of PL peak blue-shift basically corresponds to the shift point between the effect of local state and the effect of polarization electric field.The temperature starting point of PL peak blue-shift is well consistent with the temperature point where the slope of illuminant intensity-temperature curve changes significantly.Then,there is non-uniform polarization electric field distribution in the sample if the PL peak has two blue-shifts with the temperature increasing in AlGaN alloy.
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