Magnetic Field Effects on Triplet-Triplet Annihilation in Solutions: Modulation of Visible/NIR Luminescence.
Magnetic Field Effects on Triplet-Triplet Annihilation in Solutions: Modulation of Visible/NIR Luminescence.
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DOI：
10.1021/jz401342b
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发表时间：
2013-08-06
期刊：
影响因子：
--
通讯作者：
Vinogradov SA
中科院分区：
文献类型：
--
作者：
Mani T;Vinogradov SA
基于敏化三重态-三重态湮灭(TTA)的光子上转换是光伏和成像等领域的研究热点。通常观察到的能量上转换是来自分子的p型延迟荧光，这些分子的三重态是通过从合适的三重态施主的能量转移而填充的，随后是TTA。磁场对分子晶体中延迟荧光的影响是众所周知的，然而，关于溶液中TTA的磁场效应的例子很少，而且都局限于紫外光发射材料。在这里，我们介绍了MFE对TTA介导的可见光和近红外(NIR)发射的影响，该发射由远红外吸收的金属卟啉在室温溶液中敏化。除了可见的来自湮灭剂的延迟荧光外，我们还观察到了来自增敏剂的近红外发射，这是由于从湮灭剂传回的三重态-三重态能量转移的结果，称为“延迟磷光”。这种发射也表现出MFE，但与零化子荧光的符号相反。
Photon upconversion based on sensitized triplet-triplet annihilation (TTA) presents interest for such areas as photovoltaics and imaging. Usually energy upconversion is observed as p-type delayed fluorescence from molecules whose triplet states are populated via energy transfer from a suitable triplet donor, followed by TTA. Magnetic field effects (MFE) on delayed fluorescence in molecular crystals are well known; however, there exist only a few examples of MFE on TTA in solutions, and all of them are limited to UV-emitting materials. Here we present MFE on TTA-mediated visible and near infrared (NIR) emission, sensitized by far-red absorbing metalloporphyrins in solutions at room temperature. In addition to visible delayed fluorescence from annihilator, we also observed NIR emission from the sensitizer, occurring as a result of triplet-triplet energy transfer back from annihilator, termed “delayed phosphorescence”. This emission also exhibits MFE, but opposite in sign to the annihilator fluorescence.
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