Colloidal synthesis of size-confined CsAgCl2 nanocrystals: implications for electroluminescence applications

Article Chemistry, Physical

Ultra-wideband warm white light emission from self-trapped excitons in CsAgCl2

Tingfang Tian et al.

Summary: CsAgCl2 is a material with self-trapped exciton emission that can emit warm white light, making it ideal for high color rendering lighting.

JOURNAL OF ALLOYS AND COMPOUNDS (2022)

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Article Chemistry, Multidisciplinary

Germanium Halides Serving as Ideal Precursors: Designing a More Effective and Less Toxic Route to High-Optoelectronic-Quality Metal Halide Perovskite Nanocrystals

Xiaochen Wang et al.

Summary: The study introduces all-inorganic germanium salts, GeX4, as robust and less hazardous alternatives for improving the material properties of both Pb-based and Pb-free PNCs. GeX4 does not introduce the Ge element into the final nanocrystals, resulting in significantly improved photoluminescence quantum yield and phase stability. Theoretical calculations suggest that Ge halide precursors provide favorable conditions for the formation of defect-suppressed nanoparticles.

NANO LETTERS (2022)

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Article Chemistry, Multidisciplinary

Lead-free Double Perovskite Cs2AgIn0.9Bi0.1Cl6 Quantum Dots for White Light-Emitting Diodes

Yuqing Zhang et al.

Summary: A novel lead-free double perovskite quantum dots were successfully fabricated for white light-emitting diodes with excellent optoelectronic performance and stability. The device exhibits good luminous properties and stability, making it suitable for future lighting applications.

ADVANCED SCIENCE (2022)

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Article Chemistry, Multidisciplinary

Organic-Inorganic Hybrid Cuprous-Based Metal Halides for Warm White Light-Emitting Diodes

Xuan Meng et al.

Summary: This study presents an organic-inorganic hybrid cuprous (Cu+)-based metal halide MA(2)CuCl(3) that meets the requirements of nontoxicity, high PLQY, and dopant-free. Both single crystals and thin films of MA(2)CuCl(3) can be easily prepared by a low-cost solution method, exhibiting bright warm white-light emission with high PLQYs of 90-97%. Prototype electroluminescence devices and down-conversion LEDs fabricated with MA(2)CuCl(3) demonstrate bright luminescence with decent efficiencies and operational stability, suggesting its great potential for single-component indoor lighting and display applications.

ADVANCED SCIENCE (2022)

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Article Optics

Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes

Mingming Liu et al.

Summary: Fluoride-treated CsPbBr3 nanocrystals exhibit near unity emission efficiency at temperatures up to 373 K, with constant decay kinetics. The treatment leads to surfaces rich in fluorine with wider energy gaps than the core, suppressing carrier trapping and improving thermal stability. Devices incorporating these nanocrystals show low turn-on voltage and high external quantum efficiency, with nearly 80% efficiency maintained at high temperatures, offering a promising pathway for high-performance light-emitting diodes based on perovskite nanostructures.

NATURE PHOTONICS (2021)

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Article Chemistry, Physical

The Role Silver Nanoparticles Plays in Silver-Based Double-Perovskite Nanocrystals

Shai Levy et al.

Summary: Lead-free double perovskites are being studied as alternatives to lead halide perovskites in optoelectronic applications, with a focus on the role of metallic silver nanoparticles in crystal growth. The nucleation of perovskite nanocrystals is shown to occur on preexisting silver seeds, with evidence of charge transfer between the perovskite and silver nanoparticles leading to modified optical properties. Understanding and controlling the reduction of Ag+ at all synthetic stages is critical for achieving stability and functionality in silver-based lead-free perovskite nanocrystals.

CHEMISTRY OF MATERIALS (2021)

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Article Chemistry, Physical

Probing the Electron Beam-Induced Structural Evolution of Halide Perovskite Thin Films by Scanning Transmission Electron Microscopy

Xian-Gang Zhou et al.

Summary: The study revealed that the structural changes in gamma-CsPbIBr2 thin films under electron beam irradiation are dependent on the overall electron dose rather than the dose rate. Increasing electron dose leads to the formation of Pb nanoparticles and the transformation of the remaining framework into the Cs2IBr phase, accompanied by some amorphization. This research provides insights on minimizing electron beam irradiation artifacts for atomic-resolution imaging on CsPbIBr2 thin films.

JOURNAL OF PHYSICAL CHEMISTRY C (2021)

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Article Chemistry, Physical

Ultrastable Lead-Free CsAgCl2 Perovskite Microcrystals for Photocatalytic CO2 Reduction

Daofu Wu et al.

Summary: Lead halide perovskite has gained significant attention for its remarkable performance in optoelectronic applications, but its toxicity and instability have been major obstacles. This study introduces a facile synthesis process for novel lead-free CsAgCl2 perovskite microcrystals without organic ligands, showcasing excellent stability and potential applications in photocatalysis and photoelectrochemistry. The fundamental properties of CsAgCl2 microcrystals were characterized through temperature-dependent X-ray diffraction and photoluminescence measurements, revealing promising prospects for practical use.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2021)

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Article Chemistry, Multidisciplinary

CsPbBr3 Nanocrystal Induced Bilateral Interface Modification for Efficient Planar Perovskite Solar Cells

Jianjun Zhang et al.

Summary: By doping CsPbBr3 nanocrystals into perovskites, a bilateral interface modification was achieved which effectively suppressed defects and enhanced electron transport. The enhanced built-in electric field facilitated oriented migration of carriers within the perovskite, resulting in a power conversion efficiency exceeding 20% in the solar cells.

ADVANCED SCIENCE (2021)

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Review Chemistry, Multidisciplinary