Chua Xian Wei, Dai Linjie, Anaya Miguel, Salway Hayden, Ruggeri Edoardo, Bi Pengqing, Yang Zhihong, Stranks Samuel D, Yang Le
Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Innovis #08-03, Singapore 138634, Singapore.
ACS Nano. 2024 Jun 11;18(23):15229-15238. doi: 10.1021/acsnano.4c03753. Epub 2024 May 31.
Photon 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 (CsPbX, 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.
通过三重态-三重态湮灭实现的光子上转换（TTA-UC）提供了一条克服单结太阳能电池热力学效率限制的途径，它允许收集子带隙光子。在此，我们使用混合卤化物钙钛矿纳米晶体（CsPbX，X = Br/I）作为三重态敏化剂，将激发转移到作为三重态湮灭剂的9,10-二苯基蒽（DPA）和/或9,10-双[(三异丙基甲硅烷基)乙炔基]蒽（TIPS-An）上。我们观察到，与单个单受体系统的效率之和相比，复合系统中两种湮灭剂组合时的上转换效率高出五倍。我们的工作说明了在钙钛矿敏化系统中使用湮灭剂复合系统来增强TTA上转换的重要性，这在光捕获、生物医学成像、生物传感、治疗学和光催化等一系列潜在应用中具有前景。
