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Photoinduced Dynamics of [N(C3H7)4]2Cu4Br6 Thin Films with Dual Self-Trapped Exciton Emission and Negative Thermal Quenching.
Chemphyschem
March 2025
Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076, Siegen, GERMANY.
Organic-inorganic halocuprates(I) form a promising class of light-emitting materials with high photoluminescence (PL) quantum yield. However, the understanding of their emission properties and the PL mechanism is still limited. Here, we investigate thin films of bis(tetrapropylammonium) hexa-µ-bromo-tetrahedro-tetracuprate(I), [N(C3H7)4]2[Cu4Br6], which has a zero-dimensional (0D) molecular salt structure containing [Cu4Br6]2- ions.
View Article and Find Full Text PDFNovel fluorescence-based and portable detection platforms using nitrogen-doped carbon dots for environmental monitoring of dichloran fungicide.
Spectrochim Acta A Mol Biomol Spectrosc
March 2025
Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathumthani 12120, Thailand; Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address:
A novel fluorescence sensor utilizing label-free nitrogen self-doped carbon dots (NCDs) was developed for the sensitive, selective, and rapid determination of dichloran fungicide, popularly used in agricultural and horticultural fields. The NCDs were prepared from maleic anhydride and diethylenetriamine via a one-step pyrolysis process. They demonstrated strong blue fluorescence emission with a quantum yield of 12 %.
View Article and Find Full Text PDFExploring the Structural Origins of Optically Efficient One-Dimensional Lead Halide Perovskite Nanostructures.
J Am Chem Soc
March 2025
Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.
Metal halide perovskites have excellent optoelectronic properties. This study aims to determine how the optoelectronic properties of a model perovskite, cesium lead bromide (CsPbBr), change with length and thickness in one dimension (1D). By examining the photophysics of CsPbBr quantum dots (QDs), nanowires (NWs), and nanorods (NRs), we observe the influence of confinement, exciton diffusion, and trapping on their optical properties.
View Article and Find Full Text PDFOn-demand heralded MIR single-photon source using a cascaded quantum system.
Sci Adv
March 2025
Department of Electrical and Photonics Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
We propose a mechanism for generating single photons in the mid-infrared (MIR) using a solid-state or molecular quantum emitter. The scheme uses cavity quantum electrodynamics (QED) effects to selectively enhance a Frank-Condon transition, deterministically preparing a single Fock state of a polar phonon mode. By coupling the phonon mode to an antenna, the resulting excitation is then radiated to the far field as a single photon with a frequency matching the phonon mode.
View Article and Find Full Text PDFQuad-Nanopore Array Enables High-Resolution Identification of Four Single-Stranded DNA Homopolymers.
ACS Nano
March 2025
State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China.
The solid-state nanopore technique holds the potential to develop mechanically stable and miniaturized DNA sequencing devices. However, the limited temporal resolution due to the high electric field inside the nanopore and the lack of an effective speed control strategy have hindered the realization of sequencing. Here, we reported a quad-array (four nanopores milled with ∼30 nm interpore spacing as a detection unit) that induced a redistribution of the electric field inside and outside the nanopore array and offered high-resolution discrimination of four ssDNA homopolymer types.
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