Abstract Conventional antisolvent dripping methods face fundamental limitations in controlling crystallization kinetics, particularly manifesting as instantaneous nucleation and severe spatial inhomogeneity in scaled‐up perovskite films. Herein, a microdroplet‐phase antisolvent deposition technique is developed that establishes a controlled crystallization environment through delayed nucleation kinetics via mild antisolvent interaction and uniform microdroplet diffusion across extended substrates. The resulting small‐area (0.1 cm 2 ) device attains an external quantum efficiency (EQE) of 30.98% at 515 nm, ranking among the best‐performing green perovskite light‐emitting diodes (PeLEDs). A remarkable EQE of 23.21% is also realized when the active area expands to 6.25 cm 2 . This work provides a fundamental advancement in perovskite crystallization control and demonstrates a viable pathway toward industrial‐scale production of PeLEDs.
Xia et al. (2025) studied this question.