Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
Phys Rev Lett. 2012 Jun 29;108(26):267601. doi: 10.1103/PhysRevLett.108.267601. Epub 2012 Jun 26.
Polaron pairs are intermediate electronic states that are integral to the optoelectronic conversion process in organic semiconductors. Here, we report on electrically detected spin echoes arising from direct quantum control of polaron pair spins in an organic light-emitting diode at room temperature. This approach reveals phase coherence on a microsecond time scale, and offers a direct way to probe charge recombination and dissociation processes in organic devices, revealing temperature-independent intermolecular carrier hopping on slow time scales. In addition, the long spin phase coherence time at room temperature is of potential interest for developing quantum-enhanced sensors and information processing systems which operate at room temperature.
极化子对是有机半导体中光电转换过程所必需的中间电子态。在这里，我们报告了在室温下通过有机发光二极管中极化子对自旋的直接量子控制产生的电检测自旋回波。这种方法在微秒时间尺度上揭示了相位相干性，并提供了一种直接探测有机器件中电荷复合和离解过程的方法，揭示了慢时间尺度上温度独立的分子间载流子跳跃。此外，室温下长的自旋相位相干时间对于开发在室温下运行的量子增强传感器和信息处理系统具有潜在的兴趣。
