Photophysical properties of structural isomers of homoleptic Ir-complexes derived from xylenyl-substituted N-heterocyclic carbene ligands
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Yun, Bo-Sun | - |
dc.contributor.author | Kim, Jin-Hyoung | - |
dc.contributor.author | Kim, So-Yoen | - |
dc.contributor.author | Son, Ho-Jin | - |
dc.contributor.author | Cho, Dae Won | - |
dc.contributor.author | Kang, Sang Ook | - |
dc.date.accessioned | 2021-09-01T16:15:14Z | - |
dc.date.available | 2021-09-01T16:15:14Z | - |
dc.date.created | 2021-06-19 | - |
dc.date.issued | 2019-04-07 | - |
dc.identifier.issn | 1463-9076 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/66043 | - |
dc.description.abstract | The phosphorescence properties of fac-Ir(pmp)(3), mer-Ir(pmp)(3), fac-Ir(dmpmp)(3) and mer-Ir(dmpmp)(3) (where pmp = 3-methyl-1-phenyl-2,3-dihydro-1H-imidazo[4,5-b]pyridine and dmpmp = 1-(2',6'-dimethylbiphenyl-2-yl)-3-methyl-2,3-dihydro-1H-imidazo[4,5-b]pyridine) in CH2Cl2 were investigated. At 77 K, the fac-isomers showed blue emission with a vibronic structure, while the mer-isomers showed less structured emissions. At 300 K, all complexes showed broad and markedly red-shifted emission spectra compared to those at 77 K. The quantum yields of the Ir(dmpmp)(3) isomers were very low, and their emission lifetimes were very short compared to those of Ir(pmp)(3). In order to understand the large differences between the photodynamic properties of Ir(pmp)(3) and Ir(dmpmp)(3), we performed femtosecond time-resolved transient absorption (TA) spectroscopic measurements. The TA spectra of Ir(dmpmp)(3) were almost the same as those of Ir(pmp)(3) at a short delay time. However, Ir(dmpmp)(3) showed a new broad TA band at around 720 nm with increasing delay time. The rise time of this band was ca. 10 ps for both isomers, and this may be attributed to the geometrical change in the excited state, which is associated with the steric hindrance of the bulky dimethylphenyl substituent. Actually, Ir(dmpmp)(3) showed a strong rigidochromic shift in the emission spectra with varying temperature. To understand the molecular orbitals and the energy levels, theoretical calculations were performed using density functional theory. As a result, structural displacement takes place accompanied by the fast migration of localization of excited states via intraligand charge transfer. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ROYAL SOC CHEMISTRY | - |
dc.subject | LIGHT-EMITTING DEVICES | - |
dc.subject | CYCLOMETALATED IRIDIUM COMPLEXES | - |
dc.subject | BLUE | - |
dc.subject | PHOSPHORESCENCE | - |
dc.subject | EFFICIENCY | - |
dc.subject | EMISSION | - |
dc.subject | FLUORESCENCE | - |
dc.subject | STATE | - |
dc.title | Photophysical properties of structural isomers of homoleptic Ir-complexes derived from xylenyl-substituted N-heterocyclic carbene ligands | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Son, Ho-Jin | - |
dc.contributor.affiliatedAuthor | Cho, Dae Won | - |
dc.contributor.affiliatedAuthor | Kang, Sang Ook | - |
dc.identifier.doi | 10.1039/c9cp00553f | - |
dc.identifier.scopusid | 2-s2.0-85063636454 | - |
dc.identifier.wosid | 000464323400039 | - |
dc.identifier.bibliographicCitation | PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.21, no.13, pp.7155 - 7164 | - |
dc.relation.isPartOf | PHYSICAL CHEMISTRY CHEMICAL PHYSICS | - |
dc.citation.title | PHYSICAL CHEMISTRY CHEMICAL PHYSICS | - |
dc.citation.volume | 21 | - |
dc.citation.number | 13 | - |
dc.citation.startPage | 7155 | - |
dc.citation.endPage | 7164 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Physics | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.relation.journalWebOfScienceCategory | Physics, Atomic, Molecular & Chemical | - |
dc.subject.keywordPlus | LIGHT-EMITTING DEVICES | - |
dc.subject.keywordPlus | CYCLOMETALATED IRIDIUM COMPLEXES | - |
dc.subject.keywordPlus | BLUE | - |
dc.subject.keywordPlus | PHOSPHORESCENCE | - |
dc.subject.keywordPlus | EFFICIENCY | - |
dc.subject.keywordPlus | EMISSION | - |
dc.subject.keywordPlus | FLUORESCENCE | - |
dc.subject.keywordPlus | STATE | - |
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
(02841) 서울특별시 성북구 안암로 14502-3290-1114
COPYRIGHT © 2021 Korea University. All Rights Reserved.
Certain data included herein are derived from the © Web of Science of Clarivate Analytics. All rights reserved.
You may not copy or re-distribute this material in whole or in part without the prior written consent of Clarivate Analytics.