Engineering Nanocrystalline Perovskites for Bright and Efficient Next-Generation Displays

Metal halide perovskites (MHPs) are emerging as key materials in the development of next-generation display technologies due to their exceptional color purity and optical/electrical properties. This work presents advanced strategies in material design and device engineering aimed at enhancing the luminescence efficiency and stability of perovskite light-emitting diodes (PeLEDs) through the utilization of perovskite nanocrystals (PNCs).
The incorporation of guanidinium (GA) cations into formamidinium lead bromide (FAPbBr₃) PNCs, following with a bromide-enriched molecule overcoating, is introduced as a key material innovation.¹ This approach effectively stabilizes PNCs and passivates bromide vacancy defects, resulting in significantly improved luminous efficiency. Additionally, process optimizations are demonstrated through the adaptation of the bar-coating technique, facilitating the fabrication of large-area PeLEDs with efficiency comparable to their small-area PeLEDs.²
Further advancements are achieved by the synthesis of core/shell PNC, enabling PeLEDs to simultaneously realize high efficiency, brightness, and operational stability.³ Hybrid tandem PeLEDs, employing optimized optical structures, are designed to achieve near-ideal charge balance and superior light outcoupling, yielding devices with remarkable efficiency and narrow emission linewidths. ⁴
Surface-binding conjugated molecular multipods are also explored for their ability to reinforce the perovskite lattice and mitigate dynamic disorder, contributing to enhanced luminescent efficiency.⁵ Finally, a novel perovskite-organic solid solution structure is presented, facilitating deep-blue emission and broadening the scope of PeLED applications.⁶
These findings provide a comprehensive overview of material and process innovations that drive significant improvements in PeLED performance, establishing a foundation for future advancements in perovskite-based display technologies.

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