DC Field | Value | Language |
---|---|---|
dc.contributor.author | Rajakannu, Palanisamy | ko |
dc.contributor.author | Kim, Hyung Suk | ko |
dc.contributor.author | Lee, Woochan | ko |
dc.contributor.author | Kumar, Ajay | ko |
dc.contributor.author | Lee, Min Hyung | ko |
dc.contributor.author | Yoo, Seunghyup | ko |
dc.date.accessioned | 2020-10-15T01:55:07Z | - |
dc.date.available | 2020-10-15T01:55:07Z | - |
dc.date.created | 2020-09-26 | - |
dc.date.issued | 2020-08 | - |
dc.identifier.citation | INORGANIC CHEMISTRY, v.59, no.17, pp.12461 - 12470 | - |
dc.identifier.issn | 0020-1669 | - |
dc.identifier.uri | http://hdl.handle.net/10203/276592 | - |
dc.description.abstract | Rigid naphthalene benzimidazole (NBI) based ligands (L-1 and L-2) are synthesized and utilized to make deep red phosphorescent cyclometalated iridium(III) complexes ([Ir(NBI)(2)(PyPz(CF3))] (1) and [Ir(DPANBI)(2)(PyPz(CF3))] (2)). Complexes 1 and 2 are prepared from the reaction of L1/L2 with the aid of ancillary ligands (PyPz(CF3), 2-(3-(trifluoromethyl)-1H-pyrazol-5-yl)pyridine) in a two step method. The complexes are characterized by analytical and spectroscopic methods, as well as X-ray diffraction for 1. These complexes show a strong emission in the range of 635700 nm that extends up to the near-infrared region (800 nm). The introduction of the diphenylamino (DPA) donor group on the naphthalene unit leads to a further red-shift in the emission. The complexes exhibit radiative quantum efficiency (Phi(PL)) of 0.270.29 in poly(methylmethacrylate) film and relatively short phosphorescence decay lifetimes (tau = 1.13.5 mu s). The structural, electronic, and optical properties are investigated with the support of density functional theory (DFT) and time-dependent-DFT calculations. The calculation results indicate that the lowest-lying triplet (T-1) excited state of 1 has a mixed metal-to-ligand charge transfer ((MLCT)-M-3) and ligand-centered ((LC)-L-3) character, while 2 shows a dominant 3LC character. Deep red-emitting organic light-emitting diodes fabricated using 1 as a dopant display a maximum external quantum efficiency of 10.9% with the CIE color coordinates of (0.690, 0.294), with an emission centered at 644 and 700 nm. Similarly, the emitter 2 also shows a maximum external quantum efficiency of 6.9% with emissions at 657 and 722 nm. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Naphthalene Benzimidazole Based Neutral Ir(III) Emitters for Deep Red Organic Light-Emitting Diodes | - |
dc.type | Article | - |
dc.identifier.wosid | 000570979900066 | - |
dc.identifier.scopusid | 2-s2.0-85090613472 | - |
dc.type.rims | ART | - |
dc.citation.volume | 59 | - |
dc.citation.issue | 17 | - |
dc.citation.beginningpage | 12461 | - |
dc.citation.endingpage | 12470 | - |
dc.citation.publicationname | INORGANIC CHEMISTRY | - |
dc.identifier.doi | 10.1021/acs.inorgchem.0c01561 | - |
dc.contributor.localauthor | Yoo, Seunghyup | - |
dc.contributor.nonIdAuthor | Kumar, Ajay | - |
dc.contributor.nonIdAuthor | Lee, Min Hyung | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | IRIDIUM(III) COMPLEXES BEARING | - |
dc.subject.keywordPlus | EFFICIENCY ROLL-OFF | - |
dc.subject.keywordPlus | ORGANOMETALLIC COMPLEXES | - |
dc.subject.keywordPlus | PHOTOPHYSICAL PROPERTIES | - |
dc.subject.keywordPlus | PHOSPHORESCENT MATERIALS | - |
dc.subject.keywordPlus | QUANTUM EFFICIENCY | - |
dc.subject.keywordPlus | LIGANDS | - |
dc.subject.keywordPlus | DESIGN | - |
dc.subject.keywordPlus | OLEDS | - |
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