In this Letter, the first demonstration, to the best of our knowledge, of pulsed upconversion imaging using supercontinuum light is presented. A mid-infrared (IR) imaging system was built by combining a mid-IR supercontinuum source emitting between 1.8 and 2.6 μm with upconversion detection. The infrared signal is used to probe a sample and mixed with a synchronized 1550 nm laser pulse inside a lithium niobate (LiNbO) crystal. The signal is thus upconverted to the 860-970 nm range and acquired on a standard silicon CCD array at a rate of 22 frames per second. In our implementation, spatial features in the sample plane as small as 55 μm could be resolved.
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http://dx.doi.org/10.1364/OL.41.002466 | DOI Listing |
Nanoscale Horiz
January 2025
Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Upconverting nanoparticles (UCNPs) convert near-infrared (IR) light into higher-energy visible light, allowing them to be used in applications such as biological imaging, nano-thermometry, and photodetection. It is well known that the upconversion luminescent efficiency of UCNPs can be enhanced by using a host material with low phonon energies, but the use of low-vibrational-energy inorganic ligands and non-epitaxial shells has been relatively underexplored. Here, we investigate the functionalization of lanthanide-doped NaYF UCNPs with low-vibrational-energy SnS ligands.
View Article and Find Full Text PDFAgeing Res Rev
January 2025
Department of Pharmaceutics, NIMS Institute of Pharmacy, NIMS University, Jaipur 303121, Rajasthan, India.
Neurodegenerative diseases (NDs) are debilitating disorders characterized by the progressive and selective loss of function or structure in the brain and spinal cord. Both chronic and acute forms of these diseases are associated with significant morbidity and mortality, as they involve the degeneration of neurons in various brain regions. Misfolding and aggregation of amyloid proteins into oligomer and β-sheet rich fibrils share as common hallmark and lead to neurotoxicity.
View Article and Find Full Text PDFJ Phys Chem Lett
January 2025
Institute of Optoelectronic Technology, Fuzhou University, Fuzhou 350116, China.
Colloidal quantum dot (CQD) near-infrared (NIR) upconversion devices (UCDs) can directly convert low-energy NIR light into higher energy visible light without the need for additional integrated circuits, which is advantageous for NIR sensing and imaging. However, the state-of-the-art CQD NIR upconverters still face challenges, including high turn-on voltage (), low photon-to-photon (p-p) upconversion efficiency, and low current on/off ratio, primarily due to inherent limitations in the device structure and operating mechanisms. In this work, we developed a CQD NIR UCD based on a hole-only injection mechanism.
View Article and Find Full Text PDFNanoscale
January 2025
McMaster University, Department of Engineering Physics, Hamilton, ON M8S 4K1, Canada.
Nano Lett
January 2025
Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, China.
Lanthanide-doped fluoride nanocrystals have emerged as promising tools in biomedicine, yet their applications are still limited by their low luminescence efficiency. Herein, we developed highly efficient lithium-based core-shell-shell (CSS) nanoprobes (NPs) featuring a rhombic active domain and a spherical inert protective shell. By introducing Yb as an energy transfer bridge and optimizing the CSS design, a remarkable 1643-fold enhancement in visible emission and a 33-fold increase in NIR emission are achieved compared to original nanoparticles.
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