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OLEDs as models for bird magnetoception: detecting electron spin resonance in geomagnetic fields.
Faraday Discussions ( IF 3.3 ) Pub Date : 2019-12-16 , DOI: 10.1039/c9fd00047j Tobias Grünbaum 1 , Sebastian Milster , Hermann Kraus , Wolfram Ratzke , Simon Kurrmann , Viola Zeller , Sebastian Bange , Christoph Boehme , John M Lupton
Faraday Discussions ( IF 3.3 ) Pub Date : 2019-12-16 , DOI: 10.1039/c9fd00047j Tobias Grünbaum 1 , Sebastian Milster , Hermann Kraus , Wolfram Ratzke , Simon Kurrmann , Viola Zeller , Sebastian Bange , Christoph Boehme , John M Lupton
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Certain species of living creatures are known to orientate themselves in the geomagnetic field. Given the small magnitude of approximately 48 μT, the underlying quantum mechanical phenomena are expected to exhibit coherence times in the microsecond regime. In this contribution, we show the sensitivity of organic light-emitting diodes (OLEDs) to magnetic fields far below Earth's magnetic field, suggesting that coherence times of the spins of charge-carrier pairs in these devices can be similarly long. By electron paramagnetic resonance (EPR) experiments, a lower bound for the coherence time can be assessed directly. Moreover, this technique offers the possibility to determine the distribution of hyperfine fields within the organic semiconductor layer. We extend this technique to a material system exhibiting both fluorescence and phosphorescence, demonstrating stable anticorrelation between optically detected magnetic resonance (ODMR) spectra in the singlet (fluorescence) and triplet (phosphorescence) channels. The experiments demonstrate the extreme sensitivity of OLEDs to both static as well as dynamic magnetic fields and suggest that coherent spin precession processes of coulombically bound electron-spin pairs may play a crucial role in the magnetoreceptive ability of living creatures.
中文翻译：
OLED作为鸟类磁感受的模型：检测地磁场中的电子自旋共振。
已知某些生物物种会在地磁场中定向自己。给定约48μT的小幅度，预期潜在的量子力学现象在微秒范围内表现出相干时间。在这项贡献中，我们展示了有机发光二极管（OLED）对远低于地球磁场的磁场的敏感性，这表明这些设备中电荷载流子对自旋的相干时间可以类似地长。通过电子顺磁共振（EPR）实验，可以直接评估相干时间的下限。而且，该技术提供了确定有机半导体层内的超精细场的分布的可能性。我们将此技术扩展到同时显示荧光和磷光的材料系统，证明了单重态（荧光）和三重态（磷光）通道中的光学检测磁共振（ODMR）光谱之间存在稳定的反相关性。实验证明了OLED对静态和动态磁场都具有极高的敏感性，并表明库仑结合的电子自旋对的相干自旋旋进过程可能在生物的磁感受能力中起关键作用。
更新日期：2019-12-17
中文翻译：
OLED作为鸟类磁感受的模型：检测地磁场中的电子自旋共振。
已知某些生物物种会在地磁场中定向自己。给定约48μT的小幅度，预期潜在的量子力学现象在微秒范围内表现出相干时间。在这项贡献中，我们展示了有机发光二极管（OLED）对远低于地球磁场的磁场的敏感性，这表明这些设备中电荷载流子对自旋的相干时间可以类似地长。通过电子顺磁共振（EPR）实验，可以直接评估相干时间的下限。而且，该技术提供了确定有机半导体层内的超精细场的分布的可能性。我们将此技术扩展到同时显示荧光和磷光的材料系统，证明了单重态（荧光）和三重态（磷光）通道中的光学检测磁共振（ODMR）光谱之间存在稳定的反相关性。实验证明了OLED对静态和动态磁场都具有极高的敏感性，并表明库仑结合的电子自旋对的相干自旋旋进过程可能在生物的磁感受能力中起关键作用。
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