Universal electron transporting layers via mixing two homostructure molecules with different polarities for organic light-emitting diodes
DC Field | Value | Language |
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dc.contributor.author | Kim, K.J. | - |
dc.contributor.author | Lee, H. | - |
dc.contributor.author | Hwang, K.M. | - |
dc.contributor.author | Park, B. | - |
dc.contributor.author | Oh, H.Y. | - |
dc.contributor.author | Kim, Y.K. | - |
dc.contributor.author | Kim, Taekyung | - |
dc.date.accessioned | 2021-09-02T03:42:21Z | - |
dc.date.available | 2021-09-02T03:42:21Z | - |
dc.date.created | 2021-08-18 | - |
dc.date.issued | 2021-09 | - |
dc.identifier.issn | 1566-1199 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/15890 | - |
dc.description.abstract | In general, electron transport layer (ETL) in organic light-emtting diodes (OLEDs) consists of single component of electron transporting material (ETM) or a mixture with n-dopant such as 8-hydroxyquinolinolato-lithium (Liq). However, there exists a limit to controlling a wide range of carrier density in OLEDs according to the required characteristics of the devices due to electrically insulating property of Liq. Here, we suggest a universal strategy to construct an efficient ETL. We synthesized two ETMs, diphenyl-[4-(10-phenyl-anthracene-9-yl)-phenyl]-amine (An-Ph) and phneyl-[4-(10-phenyl-anthracene-9-yl)-phenyl]-pyridin-3-yl-amine (An-Py) that have the same core structures with different polarities in functional groups. The electrical characteristics of electron-only-devices (EODs) were investigated by space charge limited current (SCLC) modeling and impedance spectroscopy analysis. Interestingly, the homostructure type ETL composed of An-Ph and An-Py showed not only superior electron transporting capability, but also the possibility of controlling electron injection and transporting in a wide range compared to the heterostructure type ETL of An-Ph and Liq. Compared to the An-Ph-only EOD, the electron mobility in 75% An-Py-mixed homostructure EOD increased by almost 4 orders of magnitude. Such dramatic variation of electron mobility was achieved thanks to the molecular design strategy to separate charge injection and charge transport regions within a molecule, which consequently induced the giant surface potential (GSP) effect between the ETL/cathode interface. As a result, the external quantum efficiency (EQE) of blue fluorescent and phosphorescent OLEDs with the homostructure ETLs was enhanced by 28.6% and 34%, respectively, compared to that of each control device without manipulating outcoupling effects. © 2021 Elsevier B.V. | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | Elsevier B.V. | - |
dc.title | Universal electron transporting layers via mixing two homostructure molecules with different polarities for organic light-emitting diodes | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Kim, Taekyung | - |
dc.identifier.doi | 10.1016/j.orgel.2021.106220 | - |
dc.identifier.scopusid | 2-s2.0-85107439572 | - |
dc.identifier.wosid | 000672576500005 | - |
dc.identifier.bibliographicCitation | Organic Electronics, v.96 | - |
dc.relation.isPartOf | Organic Electronics | - |
dc.citation.title | Organic Electronics | - |
dc.citation.volume | 96 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Physics | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Physics, Applied | - |
dc.subject.keywordPlus | CARRIER MOBILITY | - |
dc.subject.keywordPlus | IMPEDANCE | - |
dc.subject.keywordPlus | EFFICIENT | - |
dc.subject.keywordPlus | OLEDS | - |
dc.subject.keywordAuthor | Electron transporting layer | - |
dc.subject.keywordAuthor | Giant surface potential | - |
dc.subject.keywordAuthor | OLED | - |
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