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Time‐resolved circularly polarized luminescence of Eu3+‐based systems
Chirality ( IF 2.8 ) Pub Date : 2020-12-30 , DOI: 10.1002/chir.23293 Uri Hananel 1 , Gal Schwartz 1 , Guy Paiss 1 , Lorenzo Arrico 2 , Francesco Zinna 2 , Lorenzo Di Bari 2 , Ori Cheshnovsky 1 , Gil Markovich 1
Chirality ( IF 2.8 ) Pub Date : 2020-12-30 , DOI: 10.1002/chir.23293 Uri Hananel 1 , Gal Schwartz 1 , Guy Paiss 1 , Lorenzo Arrico 2 , Francesco Zinna 2 , Lorenzo Di Bari 2 , Ori Cheshnovsky 1 , Gil Markovich 1
Affiliation
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Chiral Eu3+‐based systems are frequently studied via circularly polarized luminescence spectroscopy. The emission lifetimes of each circular polarization, however, are virtually always ignored, because in a homogeneous sample of emitters, there should be no difference between the two. However, we show that in less robust Eu3+ complex structures, as in the chiral complex Eu (facam)3, a difference in the lifetimes of the two circularly polarized emission components arises due to heterogeneity of the complexes. In this case, each species within the sample could have different degrees of circularly polarized luminescence and decay rates at certain emission lines. The superposition of the emission components of the various chiral species leads to an overall difference in decay rate between the two circular polarizations. Such a difference is also shown for Eu3+‐doped chiral TbPO4·D2O nanocrystals. We believe that this kind of measurement could be a unique tool for determining the homogeneity of a lanthanide‐based chiral system, where other methods might fail in this task.
中文翻译：
基于Eu3 +的系统的时间分辨圆偏振发光
基于手性Eu 3+的系统经常通过圆偏振发光光谱法进行研究。但是，实际上总是忽略每个圆极化的发射寿命，因为在均匀的发射器样本中，两者之间应该没有区别。但是，我们表明，在手性复杂的Eu（facam）3中，Eu 3+的复杂结构较不牢固，由于配合物的异质性，导致两个圆极化发射组分的寿命不同。在这种情况下，样品中的每种物质在某些发射线上可能具有不同程度的圆偏振发光和衰减率。各种手性物质的发射成分的叠加导致两个圆极化之间衰减率的总体差异。对于Eu 3+掺杂的手性TbPO 4 ·D 2 O纳米晶体，也显示出这种差异。我们认为，这种测量方法可能是确定基于镧系元素的手性系统同质性的独特工具，而其他方法可能无法完成该任务。
更新日期：2021-02-10
中文翻译：
基于Eu3 +的系统的时间分辨圆偏振发光
基于手性Eu 3+的系统经常通过圆偏振发光光谱法进行研究。但是，实际上总是忽略每个圆极化的发射寿命，因为在均匀的发射器样本中，两者之间应该没有区别。但是，我们表明，在手性复杂的Eu（facam）3中，Eu 3+的复杂结构较不牢固，由于配合物的异质性，导致两个圆极化发射组分的寿命不同。在这种情况下，样品中的每种物质在某些发射线上可能具有不同程度的圆偏振发光和衰减率。各种手性物质的发射成分的叠加导致两个圆极化之间衰减率的总体差异。对于Eu 3+掺杂的手性TbPO 4 ·D 2 O纳米晶体，也显示出这种差异。我们认为，这种测量方法可能是确定基于镧系元素的手性系统同质性的独特工具，而其他方法可能无法完成该任务。
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