DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, NG | ko |
dc.contributor.author | Shin, CH | ko |
dc.contributor.author | Lee, MH | ko |
dc.contributor.author | Do, Youngkyu | ko |
dc.date.accessioned | 2009-08-12T08:18:36Z | - |
dc.date.available | 2009-08-12T08:18:36Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2009-05 | - |
dc.identifier.citation | JOURNAL OF ORGANOMETALLIC CHEMISTRY, v.694, no.12, pp.1922 - 1928 | - |
dc.identifier.issn | 0022-328X | - |
dc.identifier.uri | http://hdl.handle.net/10203/10517 | - |
dc.description.abstract | Four-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.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | ELSEVIER SCIENCE SA | - |
dc.subject | ORGANIC ELECTROLUMINESCENT DEVICES | - |
dc.subject | AMORPHOUS MOLECULAR MATERIALS | - |
dc.subject | PYRIDINE BERYLLIUM COMPLEX | - |
dc.subject | DENSITY-FUNCTIONAL THEORY | - |
dc.subject | LIGHT-EMITTING-DIODES | - |
dc.subject | ELECTROPHOSPHORESCENT DEVICES | - |
dc.subject | ENERGY-TRANSFER | - |
dc.subject | BLUE | - |
dc.subject | EMISSION | - |
dc.subject | LUMINESCENCE | - |
dc.title | Four-coordinate boron compounds derived from 2-(2-pyridyl)phenol ligand as novel hole-blocking materials for phosphorescent OLEDs | - |
dc.type | Article | - |
dc.identifier.wosid | 000265467700023 | - |
dc.identifier.scopusid | 2-s2.0-84962360729 | - |
dc.type.rims | ART | - |
dc.citation.volume | 694 | - |
dc.citation.issue | 12 | - |
dc.citation.beginningpage | 1922 | - |
dc.citation.endingpage | 1928 | - |
dc.citation.publicationname | JOURNAL OF ORGANOMETALLIC CHEMISTRY | - |
dc.identifier.doi | 10.1016/j.jorganchem.2009.01.035 | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Do, Youngkyu | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Four-coordinate boron | - |
dc.subject.keywordAuthor | 2-(2-Pyridyl)phenol | - |
dc.subject.keywordAuthor | Hole-blocking material | - |
dc.subject.keywordAuthor | Organic light-emitting diode | - |
dc.subject.keywordAuthor | Phosphorescence | - |
dc.subject.keywordPlus | ORGANIC ELECTROLUMINESCENT DEVICES | - |
dc.subject.keywordPlus | AMORPHOUS MOLECULAR MATERIALS | - |
dc.subject.keywordPlus | PYRIDINE BERYLLIUM COMPLEX | - |
dc.subject.keywordPlus | DENSITY-FUNCTIONAL THEORY | - |
dc.subject.keywordPlus | LIGHT-EMITTING-DIODES | - |
dc.subject.keywordPlus | ELECTROPHOSPHORESCENT DEVICES | - |
dc.subject.keywordPlus | ENERGY-TRANSFER | - |
dc.subject.keywordPlus | BLUE | - |
dc.subject.keywordPlus | EMISSION | - |
dc.subject.keywordPlus | LUMINESCENCE | - |
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