Advancing perovskite light-emitting diodes: Multifunctional role of polymer, organic, and inorganic ligands in stability and efficiency enhancement

초록

Metal halide perovskites have revolutionized semiconductor optoelectronics and are emerging as exceptional candidates for high-performance perovskite light-emitting diodes (PeLEDs) owing to their outstanding properties including high color purity, narrow emission width (15-20 nm), tunable photoluminescence, and cost-effective solution processability. Despite these advantages, the widespread adoption of PeLEDs remains hindered by critical challenges, particularly their limited operational stability. In this review, we provide a comprehensive analysis of the recent advancements in stabilizing perovskite LEDs, focusing on the role of polymeric additives and inorganic and organic ligands in enhancing their operational half-lifetime (T50). These strategies have been demonstrated to influence the device performance, including the suppression of ion migration, reduction of interfacial hydrophilicity, minimization of nonradiative exciton recombination, and balancing of carrier injection, thereby facilitating improved carrier dynamics and enhancing both efficiency and stability. This review highlights the critical roles of polymeric additives, as well as inorganic and organic ligands, in addressing the key limitations of perovskite emitters and offers new perspectives for their integration into commercially viable optoelectronic applications.

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