Four-coordinate boron compounds derived from 2-(2-pyridyl)phenol ligand as novel hole-blocking materials for phosphorescent OLEDs

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dc.contributor.authorKim, NGko
dc.contributor.authorShin, CHko
dc.contributor.authorLee, MHko
dc.contributor.authorDo, Youngkyuko
dc.date.accessioned2009-08-12T08:18:36Z-
dc.date.available2009-08-12T08:18:36Z-
dc.date.created2012-02-06-
dc.date.created2012-02-06-
dc.date.created2012-02-06-
dc.date.issued2009-05-
dc.identifier.citationJOURNAL OF ORGANOMETALLIC CHEMISTRY, v.694, no.12, pp.1922 - 1928-
dc.identifier.issn0022-328X-
dc.identifier.urihttp://hdl.handle.net/10203/10517-
dc.description.abstractFour-coordinate boron compounds of Ph2B . 1 (2) and (C(6)F(5))(3)B(1 . H) (3) were prepared from the reaction of 2-(2-pyridyl) phenol (1 . H) ligand with triarylborane starting materials, BPh(3) and B(C(6)F(5))(3), respectively, and tested as hole-blocking layer (HBL) materials in phosphorescent OLEDs. While the crystal structure of 2 reveals the pseudo-tetrahedral geometry around the boron center with bidentate [N, O] chelation by 1, 3 is characterized as the zwitterionic four-coordinate system where the ligand 1 . H acts as monodentate [O] chelator with N-protonation. UV-Vis absorption and PL spectra of 2 and 3 are consistent with the ligand-centered, HOMO-LUMO electronic transitions with charge transfer from a phenoxide ring to a pyridine, which was further supported by time dependent DFT calculation for 2. Both compounds are found to possess the HOMO-LUMO energy gap of 3.1 eV appropriate for hole-blocking materials for phosphorescent OLEDs. The devices incorporating 2 and 3 as HBL materials displayed stable green phosphorescence of Ir(ppy)(3) (ppy = 2-phenylpyridine) with low turn-on voltage of 3.2 and 3.4 V, respectively, indicating that 2 and 3 function as HBL materials. Although both devices show the short lifetime (<1 h) probably owing to the low thermal stability, the device based on 2 displays better performances in terms of luminance, power and luminance efficiency, and external quantum efficiency in a wide range of current densities (0.1-100 mA/cm(2)) than the reference device incorporating BAlq as HBL materials. (C) 2009 Elsevier B.V. All rights reserved.-
dc.languageEnglish-
dc.language.isoen_USen
dc.publisherELSEVIER SCIENCE SA-
dc.subjectORGANIC ELECTROLUMINESCENT DEVICES-
dc.subjectAMORPHOUS MOLECULAR MATERIALS-
dc.subjectPYRIDINE BERYLLIUM COMPLEX-
dc.subjectDENSITY-FUNCTIONAL THEORY-
dc.subjectLIGHT-EMITTING-DIODES-
dc.subjectELECTROPHOSPHORESCENT DEVICES-
dc.subjectENERGY-TRANSFER-
dc.subjectBLUE-
dc.subjectEMISSION-
dc.subjectLUMINESCENCE-
dc.titleFour-coordinate boron compounds derived from 2-(2-pyridyl)phenol ligand as novel hole-blocking materials for phosphorescent OLEDs-
dc.typeArticle-
dc.identifier.wosid000265467700023-
dc.identifier.scopusid2-s2.0-84962360729-
dc.type.rimsART-
dc.citation.volume694-
dc.citation.issue12-
dc.citation.beginningpage1922-
dc.citation.endingpage1928-
dc.citation.publicationnameJOURNAL OF ORGANOMETALLIC CHEMISTRY-
dc.identifier.doi10.1016/j.jorganchem.2009.01.035-
dc.embargo.liftdate9999-12-31-
dc.embargo.terms9999-12-31-
dc.contributor.localauthorDo, Youngkyu-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorFour-coordinate boron-
dc.subject.keywordAuthor2-(2-Pyridyl)phenol-
dc.subject.keywordAuthorHole-blocking material-
dc.subject.keywordAuthorOrganic light-emitting diode-
dc.subject.keywordAuthorPhosphorescence-
dc.subject.keywordPlusORGANIC ELECTROLUMINESCENT DEVICES-
dc.subject.keywordPlusAMORPHOUS MOLECULAR MATERIALS-
dc.subject.keywordPlusPYRIDINE BERYLLIUM COMPLEX-
dc.subject.keywordPlusDENSITY-FUNCTIONAL THEORY-
dc.subject.keywordPlusLIGHT-EMITTING-DIODES-
dc.subject.keywordPlusELECTROPHOSPHORESCENT DEVICES-
dc.subject.keywordPlusENERGY-TRANSFER-
dc.subject.keywordPlusBLUE-
dc.subject.keywordPlusEMISSION-
dc.subject.keywordPlusLUMINESCENCE-
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