High-purity deep-blue perovskite light-emitting diodes (PeLEDs) are essential for next-generation displays that meet the Rec. 2020 standard. However, halide vacancies, particularly chloride, cause bandgap instability and reduced LED performance in mixed-halide perovskites. We present a chloride vacancy passivation (CVTP) strategy using sulfonate group ligands with varying chain lengths, which strongly bind to Pb(II) ions and fill the vacancies. This approach prevents phase segregation, producing color-stable deep-blue PeLEDs with a 461 nm emission peak and 2,707 cd/m2 luminance, among the highest for Rec. 2020 compliant PeLEDs. Additionally, external quantum efficiency improved to 5.68%, influenced by ligand chain length.
Heterostructure comprising two different materials offer an extra degree of freedom to control absorption band and energy level for more efficient optoelectronic devices. Nevertheless, building the efficient charge transport platform is challenging because of the different physical and chemical nature of those. Colloidal quantum dots (CQDs) and polymer hybrid structures have steadily been studied as well, however, the rational strategy to efficiently extract charge have not been proposed so far; only exhibiting a power conversion efficiency (PCE) of 6 ~ 7 %. Here, we propose a new hybrid architecture that synergistically exploits the benefits of CQDs and organics in photovoltaics by introducing small molecules into a CQD/organic stacked structure. The small molecular bridge, mixed in polymer regime facilitates exciton dissociation and charge transfer to the CQDs layer, leading the high PCE of 13.1%.
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