Unifying Nanosecond Electrical and Optical Excitations in Perovskite Light‐Emitting Diodes

ABSTRACT Metal halide perovskites offer a promising pathway toward solution‐processable monolithic lasers. In the pursuit of direct electrical pumping, optical excitation is widely employed as the primary route for investigating the gain potential at the device level. However, there is a severe timescale mismatch between ultrafast optical pulses and slower electrical injection, with optical pumping masking the massive electrical penalties. Here, we bridge this gap using 5‐ns pulsed perovskite light‐emitting diodes operating at current densities in the kA·cm −2 regime, enabling direct radiant exitance benchmarking against 2.3‐ns optical pumping on a matched timescale. Quantitative characterization reveals that electrical injection at 2.5 kA·cm −2 yields a peak radiant exitance of 80 W·cm −2 , producing an optical output equivalent to that generated by µJ·cm −2 optical fluences. Crucially, these injection levels exceed electrode‐free gain thresholds and approach full‐stack thresholds at 78 K. Our results establish a quantitative benchmark for progress toward electrically injected perovskite lasers, indicating that net electrical gain is within reach at low temperatures and paving the way for future architectures that couple effective charge injection with minimized parasitic optical losses.