Abstract

The emission properties of aluminum-doped zinc oxide are numerically investigated. A complete model for photoluminescence, based on the set of rate equations for electron–hole recombination, is used to study the influence of carrier concentration (10171021  cm3) on visible and ultraviolet (UV) emission. The set of coupled rate equations is solved numerically using the fourth-order Runge–Kutta technique for various optical pump intensities. The results for low carrier concentration (1017cm3) show that at low pump intensity (0.01mJ/cm2), visible emission is dominant in the emission spectrum, and as the pump intensity increases (1mJ/cm2), the UV emission becomes dominant. The study of ultrafast dynamics shows that for pump pulse durations of less than 1ns, the intensity of UV emission is an order of magnitude larger compared to the visible intensity for aluminum-doped zinc oxide samples with carrier concentration 1018cm3.

© 2019 Optical Society of America

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