Publications by authors named "A L Rogach"
Metal halide perovskite nanoplatelets (NPls) possess ultra-narrow photoluminescence (PL) bands tunable over the entire visible spectral range, which makes them promising for utilization in light-emitting diodes (LEDs) with spectrally pure emission colors. This calls for development of synthetic methods toward perovskite NPls with a high degree of control over both their thickness and lateral dimensions. A general strategy is developed to obtain such monodisperse CsPbI NPls through the control over the halide-to-lead ratio during heating-up reaction.
View Article and Find Full Text PDFThe desorption of conventional ligands from the surface of halide perovskite nanocrystals (NCs) often causes their structural instability and deterioration of the optoelectronic properties. To address this challenge, we present an approach of using a bidentate Lewis base ligand, namely, 1,4-bis(diphenylphosphino)butane (DBPP), for the synthesis of CsPbBr NCs. The phosphine group of DBPP has a strong interaction with the PbBr precursor, forming a highly crystalline intermediate complex during the reaction.
View Article and Find Full Text PDFMetal halide perovskites, known for their pure and tunable light emission, near-unity photoluminescence quantum yields, favorable charge transport properties, and excellent solution processability, have emerged as promising materials for large-area, high-performance light-emitting diodes (LEDs). Over the past decade, significant advancements have been made in enhancing the efficiency, response speed, and operational stability of perovskite LEDs. These promising developments pave the way for a broad spectrum of applications extending beyond traditional solid-state lighting and displays to include visible light communication (VLC) and lasing applications.
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- This study focuses on improving light emission from perovskite nanocrystal films, which are important for light-emitting devices, by using a TiO grating to enhance light extraction.
- The research found that this method resulted in a 10-fold increase in emission intensity and a reduction in photoluminescence lifetime, indicating a more efficient light output.
- Results from various imaging techniques revealed how the grating interacts with the nanocrystals, paving the way for developing higher-performing perovskite optoelectronic devices.
Article Synopsis
- Researchers focused on metal-organic frameworks (MOFs) for water splitting, addressing challenges in identifying active sites and stability during the transition to metal oxyhydroxide.
- By engineering defects in two-dimensional Fe-MOFs, they increased unsaturated Fe sites, enhancing electrocatalytic activity for oxygen and hydrogen evolution reactions (OER and HER).
- The optimized Fe-MOF exhibited outstanding performance, achieving 259 mV for OER and 36 mV for HER, providing insights into the impact of phase transformation on MOF materials' electrocatalytic properties.