Fig. 3

Transient photoluminescence during voltage pulses. Transient photoluminescence decays acquired from an optical pump pulse (λ = 355 nm, 20 ps pulse width, 0.2 µJ cm⁻² fluence) incident 1 μs before (P1) and after (P2) the start of a 0.05 A cm⁻² electrical pulse with different background bias levels as depicted in the inset diagram. Solid black lines are fits to the ABC rate equation described in the text. The instrument response function (IRF) is depicted by the gray line with a temporal resolution of 0.5 ns