Chua, Xian WeiDai, LinjieAnaya Martín, MiguelSalway, HaydenRuggeri, EdoardoBi, PengqingYang, ZhihongStranks, Samuel D.Yang, Le2024-10-082024-10-082024Chua, X.W., Dai, L., Anaya Martín, M., Salway, H., Ruggeri, E., Bi, P.,...,Yang, L. (2024). Multifold Enhanced Photon Upconversion in a Composite Annihilator System Sensitized by Perovskite Nanocrystals. ACS Nano, 18 (23), 15229-15238. https://doi.org/10.1021/acsnano.4c03753.1936-086X1936-0851https://hdl.handle.net/11441/163302Photon upconversion via triplet–triplet annihilation (TTA-UC) provides a pathway to overcoming the thermodynamic efficiency limits in single-junction solar cells by allowing the harvesting of sub-bandgap photons. Here, we use mixed halide perovskite nanocrystals (CsPbX3, X = Br/I) as triplet sensitizers, with excitation transfer to 9,10-diphenylanthracene (DPA) and/or 9,10-bis[(triisopropylsilyl)ethynyl]anthracene (TIPS-An) which act as the triplet annihilators. We observe that the upconversion efficiency is five times higher with the combination of both annihilators in a composite system compared to the sum of the individual single-acceptor systems. Our work illustrates the importance of using a composite system of annihilators to enhance TTA upconversion, demonstrated in a perovskite-sensitized system, with promise for a range of potential applications in light-harvesting, biomedical imaging, biosensing, therapeutics, and photocatalysis.application/pdf10 p.engAtribución 4.0 Internacionalhttp://creativecommons.org/licenses/by/4.0/Lead halide perovskiteTriplet−triplet annihilationUpconversionTriplet sensitizationExcitonsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1021/acsnano.4c03753