Reversible control of triplet dynamics in metal-organic framework-entrapped organic emitters via external gases
Reversible control of triplet dynamics in metal-organic framework-entrapped organic emitters via external gases
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DOI：
10.1038/s42004-018-0027-x
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发表时间：
2018-05
影响因子：
5.9
通讯作者：
Hiroyuki Mieno;R. Kabe;C. Adachi
中科院分区：
文献类型：
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作者：
Hiroyuki Mieno;R. Kabe;C. Adachi
三重态激子在有机发光二极管、生物成像和安全油墨中使用的有机发射体的物理中起重要作用。三重态激子动力学受发射体及其周围环境的影响，但没有有效的方法使用外部触发器来改变三重态动力学。在这里，我们展示了快速和可逆的控制的三重态动力学的发射晕通过外部气体诱导的外部重原子效应。发射体分子和气体之间的强相互作用通过将发射体封装在金属有机框架中来实现。暴露在氙中，氙有很大的自旋轨道耦合，加速了三重态的辐射衰变，导致了比真空下更快衰变的更强的磷光。相比之下，激子可以通过暴露于氧而非辐射猝灭。这种快速可逆的三重态动力学调节可能为响应式光开关、光存储和分子计算机提供新的平台。
Triplet excitons play an important role in the physics of organic emitters used in organic light-emitting diodes, bio-imaging, and security inks. Triplet exciton dynamics is influenced by the emitters and the environment surrounding them, but there is no effective way to alter triplet dynamics using external triggers. Here we demonstrate rapid and reversible control of the triplet dynamics of the emitter coronene via an external heavy-atom effect induced by external gases. Strong interaction between the emitter molecule and gases is achieved by encapsulating the emitter in a metal organic framework. Exposure to xenon, which has a large spin-orbit coupling, accelerates the radiative decay of triplets, leading to a stronger phosphorescence that decays more quickly than under vacuum. By contrast, excitons can be non-radiatively quenched through exposure to oxygen. This fast and reversible regulation of triplet dynamics may provide a new platform for responsive photo-switches, optical storage, and molecular computers.