Diammonium-Mediated Perovskite Film Formation for High-Luminescence Red Perovskite Light-Emitting Diodes

Article Chemistry, Multidisciplinary

Spacer Cation Alloying in Ruddlesden-Popper Perovskites for Efficient Red Light-Emitting Diodes with Precisely Tunable Wavelengths

Jian Qing et al.

Summary: A new method is employed in this study to achieve efficient red light-emitting diodes with tunable emission wavelengths in perovskite materials, reaching peak efficiencies of 11.5%.

ADVANCED MATERIALS (2021)

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Article Chemistry, Physical

Energy-Funneling Process in Quasi-2D Perovskite Light-Emitting Diodes

Yuanzhi Jiang et al.

Summary: Quasi-2D perovskites are seen as next-generation materials for light-emitting applications due to their excellent radiative efficiency and processability. They possess an energy-funneling process and can meet the requirements of stable emission and display technologies through various engineering strategies, providing promising directions for future advancements.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2021)

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Article Multidisciplinary Sciences

Ligand-engineered bandgap stability in mixed-halide perovskite LEDs

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.

NATURE (2021)

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Article Multidisciplinary Sciences

Phenylalkylammonium passivation enables perovskite light emitting diodes with record high-radiance operational lifetime: the chain length matters

Yuwei Guo et al.

Summary: Researchers investigate how the use of ammonium passivation molecules with different alkyl chain lengths can enhance device stability by suppressing iodide ion migration through steric hindrance and Coulomb interactions, thereby improving the performance of perovskite light emitting diodes.

NATURE COMMUNICATIONS (2021)

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Review Chemistry, Multidisciplinary

Defect Passivation in Lead-Halide Perovskite Nanocrystals and Thin Films: Toward Efficient LEDs and Solar cells

Junzhi Ye et al.

Summary: Lead-halide perovskites have emerged as leading candidates for next-generation LEDs and solar cells due to their high photoluminescence quantum yields. Defects at the surface and grain boundaries significantly impact charge-carrier transport and efficiency, necessitating the development of effective passivation strategies for performance improvement.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

All-Inorganic Quantum-Dot LEDs Based on a Phase-Stabilized α-CsPbI3 Perovskite

Ya-Kun Wang et al.

Summary: The all-inorganic nature of CsPbI3 perovskites enhances stability in perovskite devices. Inorganic ligand exchange leads to CsPbI3 QD films with superior phase stability and increased thermal transport. LEDs with KI-exchanged QD films exhibit increased thermal transport and higher operating stability compared to control devices.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Materials Science, Multidisciplinary

Enhanced Electrochemical Stability by Alkyldiammonium in Dion-Jacobson Perovskite toward Ultrastable Light-Emitting Diodes

Kwan Ho Ngai et al.

Summary: The BDA-PeLED exhibits significantly enhanced stability with a record operational half-lifetime T-50 of 189.4 hours at high current density. The main origins of instability in PeLEDs without BDA are the generation of deep traps at interfaces and the infiltration of anions under long-term electric stress.

ADVANCED OPTICAL MATERIALS (2021)

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Review Optics

High-performance quasi-2D perovskite light-emitting diodes: from materials to devices

Li Zhang et al.

Summary: Quasi-2D perovskites have superior semiconducting properties and outstanding optical characteristics due to their structural characteristics. The inherent quantum-well structure gives them a large exciton binding energy, resulting in high PLQY.

LIGHT-SCIENCE & APPLICATIONS (2021)

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Article Chemistry, Multidisciplinary

Emission Wavelength Tuning via Competing Lattice Expansion and Octahedral Tilting for Efficient Red Perovskite Light-Emitting Diodes

Guanwei Sun et al.

Summary: The electronic structure of lead halide perovskites can be tuned through the composition and structure of the BX6 octahedron, affecting emission wavelength and photoluminescence properties. The addition of large A-site cations can lead to lattice expansion or octahedral tilting, resulting in spectral redshift or blueshift of emission peak for wavelength tuning. Excess cations can also passivate the perovskites, leading to improved quantum yield, PL lifetime, and recombination ratio, ultimately achieving a high-efficiency red perovskite light-emitting diode.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Perovskite Light-Emitting Diodes with EQE Exceeding 28% through a Synergetic Dual-Additive Strategy for Defect Passivation and Nanostructure Regulation

Zhe Liu et al.

Summary: A synergetic dual-additive strategy was used to prepare perovskite films with low defect density and high environmental stability, leading to the formation of perovskite nanocrystals with a quasi-core/shell structure that exhibited improved stability and efficiency in green PeLEDs.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Multifunctional Crosslinking-Enabled Strain-Regulating Crystallization for Stable, Efficient α-FAPbI3-Based Perovskite Solar Cells

Hengkai Zhang et al.

Summary: By introducing the in situ crosslinking-enabled strain-regulating crystallization (CSRC) method with trimethylolpropane triacrylate (TMTA), the tensile strain and grain size of perovskite solar cells (PSCs) based on alpha-Formamidinium lead triiodide (alpha-FAPbI(3)) were successfully regulated, leading to significantly enhanced performance. The CSRC approach not only improved power conversion efficiency (PCE), but also ensured outstanding device stability under both long-term storage and light soaking conditions.

ADVANCED MATERIALS (2021)

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Review Chemistry, Physical

Strain analysis and engineering in halide perovskite photovoltaics

Dongtao Liu et al.

Summary: Halide perovskites are a promising candidate for clean-energy technologies due to their low cost and excellent semiconductor properties, but challenges with device efficiency and stability persist. Recent advancements have tackled the issue of strain in perovskites, showing improvements in both efficiency and stability of devices. Further research is needed to fully understand strain in halide perovskites and continue enhancing their performance.

NATURE MATERIALS (2021)

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Article Chemistry, Multidisciplinary