Record operational stability and lasing-level current densities enabled by incremental PeLED downscaling

We present variable-size circular micro methylammonium lead iodide PeLEDs and systematically examine their performance in moderate and high current density regimes. We demonstrate the beneficial influence of device downscaling on the internal heat generation and its positive impact on lifetime. For micron size glass-based devices with external quantum efficiencies (EQE) of around 5.5 %, we achieve a T50 > 5 h at 1000 mA·cm-2 at room temperature. The scaling-down approach and device architecture optimizations allowed for pulsed driving of the PeLEDs as short as 250 ns, reaching exceptionally large current densities above 5 kA·cm-2 and radiance values above 30000 W·m-2·sr-1.