OLED作为鸟类磁感受模型：探测geomagnetic fields中的电子自旋共振
OLEDs as models for bird magnetoception: detecting electron spin resonance in geomagnetic fields
摘要：
我们知道，某些种类的生物可以在地磁场中确定自己的方位。考虑到大约48 μT的小幅度，潜在的量子力学现象预计将表现出接近毫秒制度的相干时间。在这篇文章中，我们显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，这表明这些器件中电荷载流子对自旋的相干时间可以同样长。通过电子顺磁共振（EPR）实验，可以直接评估的相干时间的下限。此外，该技术提供了确定有机半导体层内的超精细场分布的可能性。我们将这种技术扩展到表现出荧光和磷光的材料系统，证明了单重态（荧光）和三重态（磷光）通道中光学检测到的磁共振（ODMR）光谱之间的稳定关系。实验证明了OLED对静态和动态磁场的极端敏感性，并表明库仑束缚电子自旋对的相干自旋进动过程可能在生物的磁感受能力中起着至关重要的作用。
英文摘要：
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 approaching the millisecond regime. In this contribution, we show 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) channel. 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.
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