Related references
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Kang Wang et al.
Summary: A ligand design strategy is employed to suppress phase disproportionation in quasi-two-dimensional halide perovskites, resulting in better phase control and improved electroluminescence efficiencies. The perovskite thin films with extended pi-conjugation length and increased cross-sectional area of the ligand exhibit narrowed phase distributions, reduced defect densities, and enhanced radiative recombination efficiencies, achieving efficient and stable deep-red light-emitting diodes.
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Summary: This study has successfully achieved spectrally stable emission of blue PeLEDs by using bifunctional passivators of Lewis-base benzoic acid anions and alkali metal cations. By passivating the under-coordinated lead atoms and suppressing halide ion migration, the performance of the devices has been improved significantly, achieving high external quantum efficiency.
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Wenhao Bai et al.
Summary: Ultra-high-efficiency green perovskite light-emitting diodes (PeLEDs) are achieved by regulating charge carrier transport and near-field light distribution to reduce electron leakage and enhance light outcoupling efficiency, resulting in quantum efficiencies surpassing 30%. This is accomplished by using Ni0.9Mg0.1Ox films with high refractive index and increased hole carrier mobility as the hole injection layer, and inserting a polyethylene glycol layer between the hole transport layer and the perovskite emissive layer to block electron leakage and reduce photon loss. This study provides an interesting idea for constructing super high-efficiency PeLEDs by balancing electron-hole recombination and enhancing light outcoupling.
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Summary: An in situ halide exchange method is developed to achieve efficient and bright deep-blue perovskite-based LEDs. By spin-coating an organic halide salts solution to treat blue perovskites, the halide-exchange process leads to homogeneous mixed-halide perovskites. Introduction of multifunctional organic ammonium halide salts further reduces trap density and improves the quality of deep-blue perovskites.
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Summary: By investigating the influence of bifunctional zwitterions on the crystallization kinetics of quasi-2D perovskites, this study provides useful directions for tuning the crystallization kinetics, leading to high-performance perovskite LEDs. The zwitterions act as co-spacer organic species and inhibit the aggregation of colloidal precursors, resulting in a more concentrated n distribution and improved energy transfer efficiency. The achieved high-efficiency blue LEDs have a recorded external quantum efficiency of 15.6% at 490 nm and prolonged operation stability of 55.3 min.
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Xinyu Shen et al.
Summary: Despite the well-established defect tolerance of metal halide perovskites (MHPs), various sources of defects in MHPs, such as grain boundaries, colloidal nanocrystal surfaces, and heterointerfaces with charge-transport layers, significantly affect the efficiency and stability of LEDs. Defect passivation strategies are essential for improving device performance.
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Summary: This study reports the development of ultra-bright, efficient, and stable light-emitting diodes (PeLEDs) made of core/shell perovskite nanocrystals. The nanocrystals, obtained through in situ reaction of benzylphosphonic acid with polycrystalline perovskite films, demonstrate strong carrier confinement and maintain good charge-transport properties.
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Summary: This study reports a new method to directly synthesize suitably coupled, monodispersed, ultrasmall perovskite quantum dot films on a substrate. By developing ligand structures with specific head and tail groups, control over the quantum dots' size, monodispersity, and coupling is achieved. The resulting blue PeLEDs exhibit high external quantum efficiency.
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Yang Shen et al.
Summary: Perovskite light-emitting diodes (PeLEDs) have potential in solution-processable display applications. However, the performance of blue PeLEDs is hindered by trap-mediated nonradiative recombination losses and halide phase segregation. Modulating mixed-halide perovskite materials through defect passivation can improve the performance of sky-blue PeLEDs, achieving high external quantum efficiency and stable emission.
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Summary: Efficient deep-blue PeLEDs have been achieved through a new chemical strategy that controls the interaction between phenylbutylamine and ethylamine with perovskites, resulting in an external quantum efficiency of 4.62% and a stable EL peak at 457 nm.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
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X. Q. Ren et al.
Summary: This study investigates the spectral evolution of the black hole candidate EXO 1846-031 during its 2019 outburst. The results show that the continuum spectrum can be well modeled with an absorbed disk-blackbody plus cutoff power law, in the hard, intermediate, and soft states. Additionally, an emission line at approximately 6.6 keV is detected in the hard intermediate state. The study suggests that the inner disk radius of the black hole may have settled at the innermost stable circular orbit (ISCO), but the apparent inner radius is unphysically small in the hard and hard intermediate states.
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(2022)
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Summary: In this study, high-efficiency sky-blue perovskite light-emitting diodes (PeLEDs) were achieved by incorporating pseudohalide thiocyanates as additives. The additives were able to passivate nonradiative trap defects and stabilize the perovskite structure, resulting in an improved photoluminescence quantum yield. The external quantum efficiencies of the sky-blue PeLEDs were increased from 5.75% to 11.93% due to the modulation of thiocyanates. Spectral and operational stability of the devices were also demonstrated.
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Summary: Functional phenethylammonium bromine-modified CsPbBr3 nanocrystals are introduced as a multifunctional additive to improve the efficiency and stability of quasi-2D perovskite films. They serve as heteronuclear seeds, passivate intrinsic defects, and create a new carrier-transfer pathway, resulting in enhanced energy transfer and radiation recombination.
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Summary: Efficient blue perovskite light-emitting diodes (PeLEDs) have been a challenge, with only promising results in the sky-blue region. This study demonstrates deep-blue PeLEDs with guanidine (GA+)-induced perovskite emitters, achieving spectrally stable PeLEDs with a record external quantum efficiency (EQE) over 3.41%. The presence of GA+ stabilizes low-dimensional species, retarding energy transfer and facilitating deep-blue electroluminescence. This finding offers a new approach to achieve deep-blue PeLEDs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
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Kostiantyn Sakhatskyi et al.
Summary: This article provides a concise overview of the undesirable effects caused by ion migration in halide perovskites and highlights specific issues in photovoltaics, light-emitting diodes, and hard radiation detection. Finally, a unique use case of exploiting ion migration in designing emerging memory and computing technologies is highlighted.
ACS ENERGY LETTERS
(2022)
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Xiao-Ke Liu et al.
Summary: Perovskite emitters have shown promising optoelectronic properties suitable for light-emitting applications, with rapid progress in the development of PeLEDs reaching external quantum efficiencies of over 20%. The key focus is on improving the performance, stability, and reducing toxicity hazards of PeLEDs.
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