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Delayed Fluorescence in Dual-Doped Perovskite Nanocrystals: Insight into the Role of Dopants.
Chem Asian J
January 2025
JNCASR: Jawaharlal Nehru Centre for Advanced Scientific Research, New Chemistry Unit, Jakkur, 560064, Bangalore, INDIA.
This study investigates the photophysical behaviour of Mn/Fe and Mn/Sn co-doped CsPbCl3 perovskite nanocrystals (NCs) to explore carrier dynamics and dopant interactions. Using gated photoluminescence (PL) and temperature-dependent measurements, we elucidate the impact of dopant chemistry on exciton behaviour, focusing on vibrationally assisted delayed fluorescence (VADF) and energy transfer mechanisms. The efficiency of VADF is influenced by factors such as the bandgap, temperature, quantum confinement, and host composition.
View Article and Find Full Text PDFInsights into excitonic behavior in single-atom covalent organic frameworks for efficient photo-Fenton-like pollutant degradation.
Nat Commun
January 2025
Department of Environment, Zhejiang University of Technology, Hangzhou, 310014, China.
The generation of radicals through photo-Fenton-like reactions demonstrates significant potential for remediating emerging organic contaminants (EOCs) in complex aqueous environments. However, the excitonic effect, induced by Coulomb interactions between photoexcited electrons and holes, reduces carrier utilization efficiency in these systems. In this study, we develop Cu single-atom-loaded covalent organic frameworks (Cu/COFs) as models to modulate excitonic effects.
View Article and Find Full Text PDFDetermination of the carrier temperature in weakly confined semiconductor nanocrystals using time-resolved optical spectroscopy.
Nanoscale
January 2025
Physics and Chemistry of Nanostructures, Ghent University, 9000 Ghent, Belgium.
Many applications of nanocrystals rely on their use in light detection and emission. In recent years, nanocrystals with more relaxed carrier confinement, including so-called 'bulk' and 2D implementations, have made their stake. In such systems, the charge carriers generated after (photo-)excitation are spread over a semi-continuous density of states, behaviour controlled by the carrier temperature .
View Article and Find Full Text PDFCreation of Piezoelectricity in Quadruple Perovskite Oxides by Harnessing Cation Defects and Their Application in Piezo-Photocatalysis.
ACS Nano
January 2025
WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA 6102, Australia.
Quadruple perovskite oxides have received extensive attention in electronics and catalysis, owing to their cation-ordering structure and intriguing physical properties. However, their repertoires still remain limited. In particular, piezoelectricity from quadruple perovskites has been rarely reported due to the frustrated symmetry-breaking transition in A-site-ordered perovskite structures, disabling their piezoelectric applications.
View Article and Find Full Text PDFAdaptable Blueprint for Non-metal Near-Infrared Organic Photocatalysts by Aromatic Sulfones.
ACS Appl Mater Interfaces
January 2025
Graduate School of Environmental Science, Hokkaido University, N10, W5, Sapporo 060-0810, Japan.
We present a versatile approach to designing and utilizing high-performance nonmetal near-infrared (NIR) organic photocatalysts based on aromatic sulfones. Current NIR photocatalysts are mainly metal complexes and inorganic materials, while the few reported nonmetal organic NIR photocatalysts primarily use photosensitization to produce active species such as singlet oxygen. Our sulfone-rosamine-based redox photocatalyst demonstrates exceptional capabilities, including high ability for metal-free photo-oxidative bromination, intrinsically oxygen-independent redox reactions, and remarkable photostability with a turnover number (TON) exceeding 2800.
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