Polymerization-orchestrated crystallization for efficient blue PeLEDs

Blue perovskite light-emitting diodes (PeLEDs) remain limited by the intrinsic trade-off between nanocrystal confinement and crystallinity. This commentary discusses a recent work introducing an in situ polymerization strategy based on polymerizable ligands such as OEGA to regulate perovskite crystallization dynamics. By coupling precursor coordination with post-annealing polymer network formation, this approach enables simultaneous control of nanocrystal size and structural order. The resulting films exhibit enhanced phase stability, reduced defect formation, and improved optoelectronic properties, leading to high-performance blue emission. This strategy represents a shift in ligand design from static surface passivation to active participation in crystallization engineering. We highlight its significance in overcoming long-standing challenges in blue PeLEDs and discuss its potential for broader application in perovskite optoelectronics through programmable polymer-assisted growth control.