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 (1017-1020 cm-3 ) on the 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 and pulse durations. The results for low carrier concentration (~1017 cm-3 ) show that at low pump intensity (0.01 mJ/cm2 ) visible emission is dominant in the emission spectrum and, as the pump intensity increases (~1 mJ/cm2 ), the UV emission becomes dominant. The study of ultrafast dynamics shows that for pump pulse durations of less than ~ 1 ns the intensity of the UV emission is an order of magnitude larger compared to the visible intensity for aluminum-doped ZnO samples with carrier concentration ~1018 cm-3 .
Bethany Campbell , Priscilla Kelly, and Lyuba Kuznetsova, "Ultrafast dynamics of the ultraviolet and visible photoluminescence in the aluminum-doped zinc oxide metamaterial," Proc. SPIE 10720, Nanophotonic Materials XV, 1072008 (Presented at SPIE Nanoscience + Engineering: August 22, 2018; Published: 19 September 2018); https://doi.org/10.1117/12.2320889.
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