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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Intramolecular Versus Intermolecular Triplet Fusion in Multichromophoric Photochemical Upconversion
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Intramolecular Versus Intermolecular Triplet Fusion in Multichromophoric Photochemical Upconversion

机译：分子内与分子间三联融合在多尺寸光化学上增强层

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Photon upconversion is a process that creates high-energy photons under low photon energy excitation. The effect of molecular geometry on the triplet fusion upconversion process has been investigated in this work through the design and synthesis of four new 9,10-diphenylanthracene (DPA) derivatives by employing platinum octaethylporphyrin as the triplet sensitizer. These new emitter molecules containing multiple DPA subunits linked together via a central benzene core exhibit high fluorescence quantum yields. Interestingly, large differences in the triplet fusion upconversion performance were observed between the derivatives with the meta-substituted dimer showing the closest performance to the DPA reference. The differences are discussed in terms of the statistical probability for obtaining a high-energy singlet excited state from triplet fusion, f, for both inter- and intramolecular processes and the effect of magnetic field on the upconversion efficiency. These results demonstrate the challenges to be overcome in improving triplet fusion upconversion efficiency based on multichromophoric emitter systems.
机译：Photon Upconversion是一种在低光子能量激发下产生高能光子的过程。通过使用铂八丁基卟啉作为三重态敏化剂，通过设计和合成四种新的9,10-二苯基蒽（DPA）衍生物，研究了分子几何形状对三重态融合的效果。这些新的发射体分子含有通过中央苯核心连接在一起的多个DPA亚基表现出高荧光量子产率。有趣的是，在衍生物与Meta取代二聚体之间观察到三联融合升高性能的大差异显示到DPA参考的最接近性能。根据从三重态融合，F的统计概率来讨论差异，用于从三联融合，f，用于磁场和磁场对上变化效率的效果。这些结果表明，在改善基于多尺寸发射器系统的基于多体射频升压效率时要克服的挑战。

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