Influence of intermolecular interactions on the formation of spontaneous orientation polarization in organic semiconducting films,Journal of the Society for Information Display

当前位置： X-MOL 学术 › J. Soc. Inf. Disp. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Influence of intermolecular interactions on the formation of spontaneous orientation polarization in organic semiconducting films
Journal of the Society for Information Display ( IF 1.7 ) Pub Date : 2020-07-16 , DOI: 10.1002/jsid.956
Yutaka Noguchi _{1,

2} , Kohei Osada ₂ , Kaito Ninomiya ₂ , Hewa D.C.N. Gunawardana ₃ , Kaveenga R. Koswattage ₄ , Hisao Ishii _{5,

6,

7}

Affiliation

Spontaneous orientation polarization (SOP) has been frequently observed in the evaporated films of organic light‐emitting diode materials. Because SOP modifies the charge injection and the accumulation properties of the device, understanding and controlling SOP is crucial in optimizing the performance of the device. In this study, we investigated the dominant factors for SOP formation by focusing on intermolecular interactions. We examined the giant surface potential characteristics of coevaporated films incorporating 1,3,5‐tris(1‐phenyl‐1H‐benzimidazol‐2‐yl)benzene (TPBi) that is a typical polar molecule exhibiting SOP. In the coevaporated films of TPBi and nonpolar molecules such as 4,4′‐bis(N‐carbazolyl)‐1,1′‐biphenyl and 4,4′,4″‐tris (carbazol‐9‐yl)triphenylamine, the orientation degree of the permanent dipole moment (PDM) of TPBi is significantly enhanced with diluted TPBi density, though the enhancement is weak on the film with N,N′‐bis(1‐naphthyl)‐N,N′‐diphenyl‐1,1′‐biphenyl‐4,4′‐diamine. The results indicate that the PDM interaction between polar molecules results as a negative factor for SOP formation. Furthermore, we found that SOP formation is suppressed by the surface treatment of the self‐assembled monolayer on the gold substrate, indicating a positive effect of the van der Waals interaction between the molecule and the substrate surface.

中文翻译：

分子间相互作用对有机半导体薄膜自发取向极化形成的影响

在有机发光二极管材料的蒸发膜中经常观察到自发取向极化（SOP）。由于SOP会修改器件的电荷注入和累积特性，因此了解和控制SOP对优化器件性能至关重要。在这项研究中，我们通过关注分子间的相互作用研究了形成SOP的主要因素。我们检查了共蒸发膜的巨大表面电势特征，该膜结合了1,3,5-三（1-苯基-1 H-苯并咪唑-2-基）苯（TPBi），这是一种典型的SOP极性分子。在TPBi和非极性分子（例如4,4'-bis（N-咔唑基）-1,1'-联苯和4,4'，4''-三（咔唑-9-基）三苯胺，TPBi的永久偶极矩（PDM）的取向度随稀释的TPBi密度而显着提高，尽管使用N，N'-双（1-萘基）-N，N'-二苯基-1,1'-联苯基-4,4'-二胺对薄膜的增强作用较弱。结果表明，极性分子之间的PDM相互作用是SOP形成的负面因素。此外，我们发现金表面上自组装单分子层的表面处理抑制了SOP的形成，表明分子与基材表面之间范德华相互作用的积极作用。

更新日期：2020-07-16

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11