论文标题
双极单分子电致发光和电氟色素
Bipolar single-molecule electroluminescence and electrofluorochromism
论文作者
论文摘要
仅通过将扫描隧道显微镜（STM）和光谱（STS）与STM诱导的发光（STML）相结合，了解单分子水平上光电激发和松弛途径的基本机制。在本文中，我们通过使用STML研究了在AG上吸附在AG上的超薄NaCl膜上的阳离子和阴离子荧光。使用STML。它们取决于尖端样本偏置极性，并以与STS确定的特定分子轨道的发作能相关的阈值电压出现。我们还发现荧光是由单个电子隧穿过程引起的。与密度功能理论计算的结果相比，我们提出了一种替代性多体图片来描述充电和电致发光机制。我们的研究提供了针对双极电荧光鲜明的定义明确的电压选择性的方面，以及有关OLED设备中发射器分子的短暂带电状态的作用的基本见解。
Understanding the fundamental mechanisms of optoelectronic excitation and relaxation pathways on the single-molecule level has only recently been started by combining scanning tunneling microscopy (STM) and spectroscopy (STS) with STM-induced luminescence (STML). In this paper, we investigate cationic and anionic fluorescence of individual zinc phthalocyanine (ZnPc) molecules adsorbed on ultrathin NaCl films on Ag(111) by using STML. They depend on the tip-sample bias polarity and appear at threshold voltages that are correlated with the onset energies of particular molecular orbitals, as identified by STS. We also find that the fluorescence is caused by a single electron tunneling process. Comparing with results from density functional theory calculations, we propose an alternative many-body picture to describe the charging and electroluminescence mechanism. Our study provides aspects toward well-defined voltage selectivity of bipolar electrofluorochromism, as well as fundamental insights regarding the role of transiently charged states of emitter molecules within OLED devices.
