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	2022/08
形態種別	学術雑誌
査読	査読あり
標題	Controlling charge accumulation properties of organic light-emitting diodes using dipolar doping of hole transport layers
執筆形態	共著(筆頭者)
掲載誌名	Advanced Optical Materials
掲載区分	国外
出版社・発行元	Wiley-VCH
巻・号・頁	2201278,pp.1-10
総ページ数	10
担当区分	筆頭著者,責任著者
国際共著	国際共著
著者・共著者	◎Yutaka Noguchi, Alexander Hofmann, Wolfgang Brütting
概要	It is demonstrated that dipolar doping of hole transport layers (HTLs) controls the density and polarity of the accumulated charge at the critical interface between the HTL and the emission layer (EML) in organic light-emitting diodes (OLEDs). Dipolar doping enables spontaneous orientation polarization (SOP) even in nonpolar HTL, and consequently compensates for the negative interface charge originating from the SOP of the adjacent layer. The results suggest that besides the energy level offset, SOP and permanent dipole moment of the materials should also be taken into account for realizing efficient carrier blocking interfaces. Dipolar doping is a versatile tool to tune charge accumulation, and to study its influence on device performance as well as the role of SOP in OLEDs.
DOI	10.1002/adom.202201278