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Nontoxic Material Used to Upconvert Low-energy Photons

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Researchers at the University of California, Riverside (UC Riverside) and the University of Texas at Austin demonstrated the use of nontoxic silicon nanocrystals to convert low-energy photons into high-energy ones. The use of nontoxic materials for photon upconversion could help advance the development of photodynamic treatments for cancer. Ultraviolet (UV) light can form free radicals that can attack cancer tissue. However, it does not travel deep enough into tissues to generate therapeutic radicals close to the cancer site. Near-infrared (NIR) light, in contrast, can penetrate deep...Read full article

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    Published: December 2019
    Glossary
    optical materials
    Materials that, by virtue of their optical characteristics (i.e. refractive index, dispersion, etc.), are used in optical elements. See crystal; glass; plastic lens.
    quantum dots
    A quantum dot is a nanoscale semiconductor structure, typically composed of materials like cadmium selenide or indium arsenide, that exhibits unique quantum mechanical properties. These properties arise from the confinement of electrons within the dot, leading to discrete energy levels, or "quantization" of energy, similar to the behavior of individual atoms or molecules. Quantum dots have a size on the order of a few nanometers and can emit or absorb photons (light) with precise wavelengths,...
    Research & TechnologyeducationAmericasUniversity of CaliforniaRiversideLasersLight SourcesMaterialsOpticsoptical materialsnanomaterialsphoton upconversionBiophotonicsmedicalcancerphotodynamic therapiesenergyquantum dotssilicon nanocrystalstriplet-triplet fusionTech Pulse

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