Publication date: 21st July 2025
Overshoot pulses of perovskite light-emitting diodes reveal two their operation regimes controlled by variations of driving voltage.
Rokas Gegevičius1, Ignas Ledzinskas1, Jevgenij Chmeliov1, Iakov Goldberg2, Robert Gehlhaar2 Karim Elkhouly2 and Vidmantas Gulbinas1
1Center for Physical Sciences and Technology, Sauletekio Ave. 3, LT-10257 Vilnius, Lithuania;
2IMEC, 3001 Leuven, Belgium;
In some applications, perovskite light-emitting diodes (PeLEDs) are expected to operate in pulsed mode. The generation of high-intensity light pulses requires substantial electrical pumping power, which can lead to deterioration of PeLED performance, its degradation or even damage. Contrarily, PeLEDs operating in a non-conventional regime, based on the so-called overshoot effect enables the generation of short, high-intensity, perfectly electrically synchronisable optical pulses while maintaining relatively low electrical pumping power. Here we demonstrate the generation of overshoot pulses (OSP) by FAPI PeLEDs with different perovskite layer thickness and analyse their dependence on alternating driving voltage and temperature. The intensity and shape of the OSPs are determined not only by the voltage and duration of the pump pulses, but also by the offset voltage applied between the pump pulses, as well as the afterpulse voltage applied immediately after the end of the pump pulse. The offset voltage determines the distribution of the mobile ions, strongly affects the strength and spatial distribution of the internal electric field during the pump pulse action and thus is a crucial parameter determining evolution of the conventional electroluminescence intensity and generation of the OSPs. Meanwhile, the afterpulse voltage controls the intensity and duration of the OSPs. The intensity of the OSPs increases strongly at temperatures below ~ 200 K. Mathematical modelling makes it possible to reproduce the electroluminescence dynamics and identifies two distinct PeLED operation regimes: one that facilitates OSP generation and another that prevents it.
This work was partly financed by the Research Council of Lithuania under grant agreement P-MIP-24-77
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