Side-Chain-Promoted Polymer Architecture Enabling Stable Mixed-Halide Perovskite Light-Emitting Diodes

• DOI: 10.1021/acsenergylett.4c00355
• Publication Date: 2024-04-12T10:03:41Z
• Authors: Benzheng Lyu; Hong Lin; Dongyu Li; Aleksandr Sergeev; Qiang Wang; Zhengyan Jiang; Lijun Huo; Haibin Su; Kam Sing Wong; Yufeng Wang; Wallace C. H. Choy

Mixed-halide perovskite nanocrystals (PeNCs) featuring bandgap-tunable luminescence with narrow bandwidth have emerged as promising electroluminescent materials for light-emitting diodes (LEDs) to satisfy the color standard of Rec. 2100. However, phase segregation mixed-halide perovskites severely restricts spectral stability and lifetime LEDs (PeLEDs). Here, we report that introduction multifunctional side-chain-promoted polymer architectures in synthesis I/Br-mixed PeNCs suppress halide enable PeLEDs up ∼2500 min, which is longest our knowledge. Meanwhile, exhibit pure-red electroluminescence spectrum Commission Internationale de l'Eclairage coordinates (0.705, 0.292) at one highest external quantum efficiencies reported date, 23.6%. Fundamentally, as-proposed ligand architecture simultaneously offers long-term nanocrystal dispersion, good charge transport, defect elimination, suppression. Overall, work demonstrates potential multifunctionalized ligands developing high-performance toward practical applications.