Tuning the Photophysical Properties of Homoleptic Tris-Cyclometalated Ir(III) Complexes by Facile Modification of the Imidazo-Phenanthridine and Their Application to Phosphorescent Organic Light-Emitting Diodes
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, So-Yoen | - |
dc.contributor.author | Kim, Jin-Hyoung | - |
dc.contributor.author | Lee, Sanghun | - |
dc.contributor.author | Yun, Bo-Sun | - |
dc.contributor.author | Son, Ho-Jin | - |
dc.contributor.author | Kang, Sang Ook | - |
dc.date.accessioned | 2022-08-15T11:40:58Z | - |
dc.date.available | 2022-08-15T11:40:58Z | - |
dc.date.created | 2022-08-12 | - |
dc.date.issued | 2022-05 | - |
dc.identifier.issn | 2470-1343 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/143267 | - |
dc.description.abstract | To explore the excited-state electronic structure of the blue-emitting Ir(dmp)(3) dopant material (dmp = 3-(2,6-dimethylphenyl)-7-methylimidazo[1,2-f]phenanthridine), which is notable for durable blue phosphorescent organic light-emitting diode (PhOLED), a series of homoleptic dmp-based Ir(III) complexes (DMP-R, tris [3-(2,6-dimethylphenyl)-7-R-imidazo[1,2-f ]phenanthridin-12-yl-kappa C-12,kappa N-1]-iridium, R = H, CH3, F, and CF3) were prepared by introducing an electron-donating group (EDG; -CH3) or an electron-withdrawing group (EWG; -F and -CF3) at the 7-position of the imidazophenanthridine ligand. The photophysical analysis demonstrated that the alteration from EDG to EWGs led to redshifted structureless emission profiles, which were correlated with variations in the (MLCT)-M-3/(ILCT)-I-3 ratio in the T-1 excited state. From electrochemical studies and density functional theory calculations, it turned out that the excited-state nature of the dmp-based Ir(III) complexes was significantly affected by the inductive effect of the 7-substituent of the cydometalating dmp ligand. As a result of the lowest unoccupied molecular orbital energy stabilization by the EWGs that suppressed the non-radiative pathway from the emissive triplet excited state to the (3)d-d state, the F- and CF3-modified Ir(dmp)(3) complexes (DMP-F and DMP-CF3) showed quantum yields of 27-30% in the solution state, which were at least 4- or 5-fold higher than those shown by DMP-H and DMP-CH3. A PhOLED device based on DMP-CF3 [CIE chromaticity (0.17, 0.39)], which demonstrated a distinct (MLCT)-M-3 characteristic, exhibited better electroluminescent efficiencies with an external quantum efficiency of 13.5% than that based on DMP-CH3. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | IRIDIUM(III) COMPLEXES | - |
dc.subject | EXCITED-STATES | - |
dc.subject | BLUE | - |
dc.subject | LIGANDS | - |
dc.subject | 6-AMINOPHENANTHRIDINES | - |
dc.subject | SUBSTITUENTS | - |
dc.subject | ENHANCEMENT | - |
dc.subject | EFFICIENCY | - |
dc.subject | EXCIPLEX | - |
dc.subject | DEVICES | - |
dc.title | Tuning the Photophysical Properties of Homoleptic Tris-Cyclometalated Ir(III) Complexes by Facile Modification of the Imidazo-Phenanthridine and Their Application to Phosphorescent Organic Light-Emitting Diodes | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Kang, Sang Ook | - |
dc.identifier.doi | 10.1021/acsomega.2c01155 | - |
dc.identifier.scopusid | 2-s2.0-85130822425 | - |
dc.identifier.wosid | 000820252400001 | - |
dc.identifier.bibliographicCitation | ACS OMEGA, v.7, no.20, pp.17234 - 17244 | - |
dc.relation.isPartOf | ACS OMEGA | - |
dc.citation.title | ACS OMEGA | - |
dc.citation.volume | 7 | - |
dc.citation.number | 20 | - |
dc.citation.startPage | 17234 | - |
dc.citation.endPage | 17244 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | Y | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Multidisciplinary | - |
dc.subject.keywordPlus | IRIDIUM(III) COMPLEXES | - |
dc.subject.keywordPlus | EXCITED-STATES | - |
dc.subject.keywordPlus | BLUE | - |
dc.subject.keywordPlus | LIGANDS | - |
dc.subject.keywordPlus | 6-AMINOPHENANTHRIDINES | - |
dc.subject.keywordPlus | SUBSTITUENTS | - |
dc.subject.keywordPlus | ENHANCEMENT | - |
dc.subject.keywordPlus | EFFICIENCY | - |
dc.subject.keywordPlus | EXCIPLEX | - |
dc.subject.keywordPlus | DEVICES | - |
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.