ノグチ　ユタカ   NOGUCHI Yutaka   野口　裕    所属   明治大学  理工学部    職種   専任教授
言語種別	英語
発行・発表の年月	2021/01
形態種別	学術雑誌
査読	査読あり
標題	Enhancement of the molecular orientation of TPBi in coevaporated films of UGH‐2 host molecules
執筆形態	共著(筆頭者以外)
掲載誌名	Surface and Interface Analysis
掲載区分	国外
出版社・発行元	Wiley
巻・号・頁	53(4),pp.460-465
総ページ数	6
担当区分	最終著者,責任著者
国際共著	国際共著
著者・共著者	Hewa Dewage Chandima Niroshan Gunawardana, Kohei Osada, Kaveenga Rasika Koswattage, Yutaka Noguchi
概要	In this study, we investigated the spontaneous orientation polarization (SOP) in coevaporated films of polar and nonpolar molecules. We found that the molecular orientation of TPBi in both UGH‐2 and CBP hosts was enhanced, though the apparent enhancement factor was small in the UGH‐2 host. The enhancement of the molecular orientation is attributed to the reduction of the electrostatic interaction between polar molecules (TPBi), which deteriorates SOP as previously reported. In addition, our results suggest that the SOP of TPBi is robust even in the UGH‐2 host, in contrast to the random orientation of Ir complexes in the UGH‐2 host. Considering a polyhedral shape of Ir complexes, the robust SOP of TPBi in the host molecules with a weak van der Waals interaction, such as UGH‐2, is possibly due to its disk‐like molecular shape.
DOI	https://doi.org/10.1002/sia.6933