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Summary: This paper systematically discusses ion-related issues in PeLEDs, including the material and processing origins of ion generation, the mechanisms driving ion migration, characterization approaches for probing ion distributions, the effects of ion migration on device performance and stability, and strategies for ion management. The remaining challenges and future opportunities in this field are highlighted.
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Jiachen Xi et al.
Summary: The researchers designed and synthesized a cross-linkable molecule PETA-G to solve the issue of perovskite film degradation caused by high trap densities and moisture invasion. By combining guanidine and tri-acrylate groups, a compact network structure was formed, significantly improving the moisture resistance of the perovskite film while maintaining charge transport.
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Dan Liu et al.
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Article
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Article
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Pingping Zhang et al.
Summary: This study presents a non-destructive method for patterning perovskite quantum dots based on direct photopolymerization catalyzed by lead bromide complexes. By combining direct photolithography with in situ fabrication of PQDs, this method allows for high-resolution patterning of PQDs with excellent fluorescence uniformity and stability.
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JOURNAL OF PHYSICAL CHEMISTRY LETTERS
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Xiao-Ke Liu et al.
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Yasser Hassan et al.
Summary: By utilizing multidentate ligands to treat mixed-halide perovskite nanocrystals, efficient and color-stable red electroluminescence with a wavelength centered at 620 nanometers and an external quantum efficiency of 20.3% has been achieved. The key function of the ligand treatment is to 'clean' the nanocrystal surface by removing lead atoms, which suppresses the formation of iodine Frenkel defects and halide segregation. This work demonstrates the sensitivity of metal halide perovskites to surface properties and provides a pathway to control surface defect formation and migration, crucial for achieving bandgap stability for light emission and potentially impacting other optoelectronic applications.
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