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Keywords = XEOL

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12 pages, 3862 KiB  
Article
Controlled Synthesis of Cs2NaYF6: Tb Nanoparticles for High-Resolution X-Ray Imaging and Molecular Detection
by Jian Zhao, Kunyang Wang, Wenhui Chen, Deyang Li and Lei Lei
Nanomaterials 2025, 15(10), 728; https://doi.org/10.3390/nano15100728 - 12 May 2025
Viewed by 441
Abstract
Rare-earth-doped fluoride nanoparticles (NPs), known for their tunable luminescence and high chemical stability, hold significant potential for applications in X-ray imaging and radiation dose monitoring. However, most research has primarily focused on lanthanide-doped NaLuF4 or NaYF4 nanosystems. In this work, Cs [...] Read more.
Rare-earth-doped fluoride nanoparticles (NPs), known for their tunable luminescence and high chemical stability, hold significant potential for applications in X-ray imaging and radiation dose monitoring. However, most research has primarily focused on lanthanide-doped NaLuF4 or NaYF4 nanosystems. In this work, Cs2NaYF6:Tb NPs with enhanced X-ray excited optical luminescence (XEOL) intensity were developed. Our results indicate that low oleic acid (OA) content and a high [Cs+]/[Na+] ratio favor the formation of pure cubic-phase Cs2NaYF6:Tb NPs. Cs2NaYF6:Tb NPs were successfully fabricated into thin films and employed as nanoscintillator screens for X-ray imaging, achieving a high spatial resolution of 20.0 Lp/mm. Beyond X-ray imaging applications, Cs2NaYF6:Tb NPs were also explored for spermine detection, demonstrating high sensitivity with a detection limit of 0.44 μM (under X-ray excitation) within a concentration range of 0–60 μM. These findings may contribute to the development of novel lanthanide-doped fluoride nanoscintillators for high-performance X-ray imaging and molecular sensing. Full article
(This article belongs to the Section Nanophotonics Materials and Devices)
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14 pages, 3933 KiB  
Article
A Scintillating One-Dimensional Coordination Polymer Based on Cadmium(II), N,N′-(1,4-Phenylenedicarbonyl)diglycinate, and 2,2′-Bipyridine: Crystal Structure, Hirshfeld Surface Analysis, and Luminescence Lifetime Properties †
by Niels-Patrick Pook
Solids 2021, 2(4), 371-384; https://doi.org/10.3390/solids2040023 - 13 Nov 2021
Cited by 2 | Viewed by 3556
Abstract
In recent years, several coordination polymers of different dimensions and metal–organic frameworks were tested and expected to be good candidates for closing the gap between organic and plastic scintillators on the one hand side and inorganic scintillators on the other hand side. In [...] Read more.
In recent years, several coordination polymers of different dimensions and metal–organic frameworks were tested and expected to be good candidates for closing the gap between organic and plastic scintillators on the one hand side and inorganic scintillators on the other hand side. In the present work, we report the synthesis and characterization of a novel one-dimensional scintillating coordination polymer based on cadmium(II), N,N′-(1,4-phenylenedicarbonyl)di-glycinate, and 2,2′-bipyridine. Crystals could be obtained from water–methanol solutions and the structure was determined by single-crystal diffraction. The coordination polymer exhibits scintillation under X-ray excitation and laser as well as UV-light induced photoluminescence with fast decay times. Photoluminescence and X-ray excited optical luminescence (XEOL) properties and decay times were performed using a two-dimensional photon counting streak camera system with a time resolution up to 20 ps. The non-covalent interactions and supramolecular assemblies as a potential multiplier of the scintillating effect were investigated with the aid of a Hirshfeld surface analysis. The quality and phase purity of the used crystals and pellets was clarified by powder diffraction and Rietveld refinement. Full article
(This article belongs to the Special Issue Feature Papers of Solids 2021)
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12 pages, 5385 KiB  
Article
Four-Fold Multi-Modal X-ray Microscopy Measurements of a Cu(In,Ga)Se2 Solar Cell
by Christina Ossig, Christian Strelow, Jan Flügge, Andreas Kolditz, Jan Siebels, Jan Garrevoet, Kathryn Spiers, Martin Seyrich, Dennis Brückner, Niklas Pyrlik, Johannes Hagemann, Frank Seiboth, Andreas Schropp, Romain Carron, Gerald Falkenberg, Alf Mews, Christian G. Schroer, Tobias Kipp and Michael E. Stuckelberger
Materials 2021, 14(1), 228; https://doi.org/10.3390/ma14010228 - 5 Jan 2021
Cited by 15 | Viewed by 3927
Abstract
Inhomogeneities and defects often limit the overall performance of thin-film solar cells. Therefore, sophisticated microscopy approaches are sought to characterize performance and defects at the nanoscale. Here, we demonstrate, for the first time, the simultaneous assessment of composition, structure, and performance in four-fold [...] Read more.
Inhomogeneities and defects often limit the overall performance of thin-film solar cells. Therefore, sophisticated microscopy approaches are sought to characterize performance and defects at the nanoscale. Here, we demonstrate, for the first time, the simultaneous assessment of composition, structure, and performance in four-fold multi-modality. Using scanning X-ray microscopy of a Cu(In,Ga)Se2 (CIGS) solar cell, we measured the elemental distribution of the key absorber elements, the electrical and optical response, and the phase shift of the coherent X-rays with nanoscale resolution. We found structural features in the absorber layer—interpreted as voids—that correlate with poor electrical performance and point towards defects that limit the overall solar cell efficiency. Full article
(This article belongs to the Special Issue Microscopy in Material Science: Imaging, Analytics, and New Materials)
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