论文标题
通过强烈的光耦合控制和增强单分子电致发光
Control and enhancement of single-molecule electroluminescence through strong light-matter coupling
论文作者
论文摘要
分子电子状态在分子/电极界面上的能量位置是确定分子连接的转运和光电特性的关键因素。强烈的光 - 耦合提供了操纵这些因素的潜力，从而提高了这些连接的效率和多功能性。在这里，我们研究了单分子连接的电致发光，其中该分子与等离激元纳米腔中的真空电磁场强烈耦合。我们通过使用强光 - 耦合以及单分子连接的特征来选择性地控制最低能量激发态的形成，从而证明了电致发光效率的提高。根据形成的极化状态的能量位置和组成，讨论了提高效率的机制。我们的发现表明，有可能通过强光 - 耦合来操纵分子连接中的光电转换，并有助于为开发有效的分子光电设备提供设计原理。
The energetic positions of molecular electronic states at molecule/electrode interfaces are crucial factors for determining the transport and optoelectronic properties of molecular junctions. Strong light--matter coupling offers a potential for manipulating these factors, enabling to boost in the efficiency and versatility of these junctions. Here, we investigate electroluminescence from single-molecule junctions in which the molecule is strongly coupled with the vacuum electromagnetic field in a plasmonic nanocavity. We demonstrate an improvement in the electroluminescence efficiency by employing the strong light--matter coupling in conjunction with the characteristic feature of single-molecule junctions to selectively control the formation of the lowest-energy excited state. The mechanism of efficiency improvement is discussed based on the energetic position and composition of the formed polaritonic states. Our findings indicate the possibility to manipulate optoelectronic conversion in molecular junctions by strong light--matter coupling and contribute to providing design principles for developing efficient molecular optoelectronic devices.
