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NOGUCHI Yutaka
Department Undergraduate School , School of Science and Technology Position Professor |
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| Language | English |
| Publication Date | 2022/08 |
| Type | Academic Journal |
| Peer Review | Peer reviewed |
| Title | Controlling charge accumulation properties of organic light-emitting diodes using dipolar doping of hole transport layers |
| Contribution Type | Co-authored (first author) |
| Journal | Advanced Optical Materials |
| Journal Type | Another Country |
| Publisher | Wiley-VCH |
| Volume, Issue, Page | 2201278,pp.1-10 |
| Total page number | 10 |
| Authorship | Lead author,Corresponding author |
| International coauthorship | International coauthorship |
| Author and coauthor | ◎Yutaka Noguchi, Alexander Hofmann, Wolfgang Brütting |
| Details | 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 |