Fluorescence and Electroluminescence of J-Aggregated Polythiophene Monolayers on Hexagonal Boron Nitride.,ACS Nano

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Fluorescence and Electroluminescence of J-Aggregated Polythiophene Monolayers on Hexagonal Boron Nitride.
ACS Nano ( IF 15.8 ) Pub Date : 2020-09-08 , DOI: 10.1021/acsnano.0c06280
James Kerfoot ₁ , Simon A Svatek _{1,

2} , Vladimir V Korolkov ₁ , Takashi Taniguchi ₃ , Kenji Watanabe ₄ , Elisa Antolin ₂ , Peter H Beton ₁

Affiliation

The photophysics of a semiconducting polymer is manipulated through molecular self-assembly on an insulating surface. Adsorption of polythiophene (PT) monolayers on hexagonal boron nitride (hBN) leads to a structurally induced planarization and a rebalancing of inter- and intrachain excitonic coupling. This conformational control results in a dominant 0–0 photoluminescence peak and a reduced Huang–Rhys factor, characteristic of J-type aggregates, and optical properties which are significantly different to both PT thin films and single polymer strands. Adsorption on hBN also provides a route to explore electroluminescence from PT monolayers though incorporation into hybrid van der Waals heterostructures whereby the polymer monolayer is embedded within a hBN tunnel diode. In these structures we observe up-converted singlet electroluminescence from the PT monolayer, with an excitation mechanism based upon inelastic electron scattering. We argue that surface adsorption provides a methodology for the study of fundamental optoelectronic properties of technologically relevant polymers.

中文翻译：

六方氮化硼上J聚集的聚噻吩单层的荧光和电致发光。

通过在绝缘表面上进行分子自组装来控制半导体聚合物的光物理性质。六边形氮化硼（hBN）上聚噻吩（PT）单层的吸附会导致结构诱导的平面化和相互之间的重新平衡和链内激子耦合。这种构象控制导致一个主要的0-0光致发光峰和一个减少的Huang-Rhys因子，J型聚集体的特征以及与PT薄膜和单聚合物链明显不同的光学性质。通过掺入杂化范德华异质结构中，在hBN上的吸附还提供了探索PT单层电致发光的途径，从而将聚合物单层嵌入hBN隧道二极管内。在这些结构中，我们观察到来自PT单层的上转换单重态电致发光，并具有基于非弹性电子散射的激发机制。我们认为表面吸附为研究技术上相关的聚合物的基本光电特性提供了一种方法。

更新日期：2020-10-28

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