Probing Energy-Funneling Kinetics in Nanocrystal Sublattices for Superior X-Ray Imaging.
Angew Chem Int Ed Engl
; 63(25): e202404177, 2024 Jun 17.
Article
em En
| MEDLINE
| ID: mdl-38634766
ABSTRACT
Long-lasting radioluminescence scintillators have recently attracted substantial attention from both research and industrial communities, primarily due to their distinctive capabilities of converting and storing X-ray energy. However, determination of energy-conversion kinetics in these nanocrystals remains unexplored. Here we present a strategy to probe and unveil energy-funneling kinetics in NaLuF4Mn2+/Gd3+ nanocrystal sublattices through Gd3+-driven microenvironment engineering and Mn2+-mediated radioluminescence profiling. Our photophysical studies reveal effective control of energy-funneling kinetics and demonstrate the tunability of electron trap depth ranging from 0.66 to 0.96â
eV, with the corresponding trap density varying between 2.38×105 and 1.34×107â
cm-3. This enables controlled release of captured electrons over durations spanning from seconds to 30â
days. It allows tailorable emission wavelength within the range of 520-580â
nm and fine-tuning of thermally-stimulated temperature between 313-403â
K. We further utilize these scintillators to fabricate high-density, large-area scintillation screens that exhibit a 6-fold improvement in X-ray sensitivity, 22 lp/mm high-resolution X-ray imaging, and a 30-day-long optical memory. This enables high-contrast imaging of injured mice through fast thermally-stimulated radioluminescence readout. These findings offer new insights into the correlation of radioluminescence dynamics with energy-funneling kinetics, thereby contributing to the advancement of high-energy nanophotonic applications.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article