ArticleChemical science2026
Near-infrared-to-deep-blue photon upconversion engineered from PbS quantum dots and perylene derivatives.
Article in Chemical science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Near-infrared (NIR)-to-visible light triplet-triplet annihilation photon upconversion (TTA-UC) holds great promise for solar energy harvesting, photochemistry, and bioimaging. However, achieving a large apparent anti-Stokes shift from the NIR to the blue region remains highly challenging. Here, we present the first TTA-UC system that can upconvert NIR excitation beyond 800 nm with emission approaching the deep-blue spectral region. This performance is realized by precisely engineering the triplet energy levels within only 0.06 eV among PbS quantum dots (QDs) as sensitizers, perylene-3-carboxylic acid (3-PYCA) as a novel mediator and perylene as an annihilator. The system exhibits an exceptional anti-Stokes shift of up to 1.3 eV, representing both a record performance to date and the maximum for QD-based TTA-UC systems. Meanwhile, a high TTA-UC quantum yield of 2.1% (out of a 50% maximum) is achieved, which is an order of magnitude higher than that of previously reported QD-based systems exhibiting anti-Stokes shifts above 0.8 eV. Moreover, the upconverted deep-blue light enables efficiently activated
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