Results 11 to 20 of about 3,703 (147)
Six-photon upconverted excitation energy lock-in for ultraviolet-C enhancement
Nature Communications, 2021 Photon upconversion with near-infrared excitation and ultraviolet emission has many applications, but suffers from low quantum efficiency. Here, the authors report a six-photon upconversion process in nanoparticles with heterogeneous core-multishell ...
Qianqian Su +9 more
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Au<sub>42</sub>(PET)<sub>32</sub> Nanocluster Sensitizer Unlocks the Annihilator Potential of Rubrene, Enabling High-Performance NIR-to-Visible Photon Upconversion. [PDF]
Angew Chem Int Ed EnglA needle‐shaped gold nanocluster, Au42(PET)32, serves as a powerful triplet sensitizer, enabling rubrene to fully express its intrinsic annihilator capability (spin statistical factor f = 0.58). This sensitizer–annihilator pair achieves record‐high upconversion internal quantum yields of 21.4% (808 nm excitation) and 15.0% (936 nm excitation ...
Mitsui M, Takano S, Tsukuda T.
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Phonon-assisted upconversion in twisted two-dimensional semiconductors
Light: Science & Applications, 2023 Rotation-angle-dependent phonon-assisted photon upconversion in twisted two-dimensional semiconductor is investigated. Lattice relaxation along with enhanced pump efficiency, lead to an inverted contrast between upconversion and conventional ...
Yuchen Dai +15 more
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Communications Materials, 2022 A near-infrared to visible photon upconversion device was previously shown to increase external quantum efficiency by up to 2.3%. Here, the upconversion mechanism is studied by time-resolved spectroscopy, revealing that 67% of incident photons are ...
Yuji Sakamoto +4 more
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Enhancing multiphoton upconversion through interfacial energy transfer in multilayered nanoparticles
Nature Communications, 2020 Photon upconversion in nanoparticles is often limited by concentration quenching. The authors present a multi-layered particle approach that enables increased upconversion efficiency by reducing cross-relaxation, through spatial separation of activator ...
Bin Zhou +7 more
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One-photon red light-triggered disassembly of small-molecule nanoparticles for drug delivery
Journal of Nanobiotechnology, 2021 Background Photoresponsive drug delivery can achieve spatiotemporal control of drug accumulation at desired sites. Long-wavelength light is preferable owing to its deep tissue penetration and low toxicity.
Kaiqi Long +7 more
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Applied Sciences, 2021 In this work we report on the spectroscopic properties and the near-infrared to visible upconversion of Er3+ ions in aluminosilicate glasses manufactured by directionally solidification with the laser floating zone technique. Glasses were manufactured in
Daniel Sola +3 more
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Room temperature multi-phonon upconversion photoluminescence in monolayer semiconductor WS2
Nature Communications, 2019 Two-dimensional materials show promise for photon upconversion processes due to their strong photon-exciton and phonon-exciton interactions. Here, the authors report room temperature upconversion photoluminescence in monolayer WS2 with high energy gain ...
J. Jadczak +6 more
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Advanced Science, 2018 Upconverting materials have achieved great progress in recent years, however, it remains challenging for the mechanistic research on new upconversion strategy of lanthanides.
Bo Zhou +6 more
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Upconversion Luminescence Sensitized pH-Nanoprobes
Molecules, 2017 Photon upconversion materials, featuring excellent photophysical properties, are promising for bio-medical research due to their low autofluorescence, non-cytotoxicity, low photobleaching and high photostability.
Manoj Kumar Mahata +2 more
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