Asymmetric Host Molecule Bearing Pyridine Core for Highly Efficient Blue Thermally Activated Delayed Fluorescence OLEDs
DC Field | Value | Language |
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dc.contributor.author | Yoon, Jiwon | - |
dc.contributor.author | Kim, Seong Keun | - |
dc.contributor.author | Kim, Hyung Jong | - |
dc.contributor.author | Choi, Suna | - |
dc.contributor.author | Jung, Sang Won | - |
dc.contributor.author | Lee, Hyuna | - |
dc.contributor.author | Kim, Jun Yun | - |
dc.contributor.author | Yoon, Dae-Wi | - |
dc.contributor.author | Han, Chang Wook | - |
dc.contributor.author | Chae, Weon-Sik | - |
dc.contributor.author | Kwon, Jang Hyuk | - |
dc.contributor.author | Cho, Min Ju | - |
dc.contributor.author | Choi, Dong Hoon | - |
dc.date.accessioned | 2021-08-30T05:43:40Z | - |
dc.date.available | 2021-08-30T05:43:40Z | - |
dc.date.created | 2021-06-19 | - |
dc.date.issued | 2020-12-09 | - |
dc.identifier.issn | 0947-6539 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/50823 | - |
dc.description.abstract | In this study, two host materials, pCzBzbCz and pCzPybCz, are synthesized to achieve a high efficiency and long lifetime of blue thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The molecular design strategy involves the introduction of a pyridine group into the core structure of pCzPybCz as an electron-withdrawing unit, and an electron-donating phenyl group into the structure of pCzBzbCz. These host materials demonstrate good thermal stability and high triplet energy (T-1=3.07 eV for pCzBzbCz and 3.06 eV for pCzPybCz) for the fabrication of blue TADF-OLEDs. In particular, pCzPybCz-based OLED devices demonstrate an external quantum efficiency (EQE) of 22.7 % and an operational lifetime of 24 h (LT90, time to attain 90 % of initial luminance) at an initial luminance of 1000 cd m(-2). This superior lifetime could be explained by the C-N bond dissociation energy (BDE) in the host molecular structure. Furthermore, a mixed-host system using the electron-deficient 2,4-bis(dibenzo[b,d]furan-2-yl)-6-phenyl-1,3,5-triazine (DDBFT) is proposed to inhibit the formation of the anion state of our host materials. In short, the device operational lifetime is further improved by applying DDBFT. The carbazole-based asymmetric host molecule containing a pyridine core realizes a high-efficiency blue TADF-OLED showing a positive effect on the operating lifetime, and can provide useful strategies for designing new host materials. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | WILEY-V C H VERLAG GMBH | - |
dc.subject | LIGHT-EMITTING-DIODES | - |
dc.subject | FACILE SYNTHESIS | - |
dc.subject | PHOSPHINE-OXIDE | - |
dc.subject | PHOSPHORESCENT | - |
dc.subject | LIFETIME | - |
dc.subject | DEGRADATION | - |
dc.subject | DESIGN | - |
dc.subject | GUEST | - |
dc.subject | MECHANISMS | - |
dc.subject | STABILITY | - |
dc.title | Asymmetric Host Molecule Bearing Pyridine Core for Highly Efficient Blue Thermally Activated Delayed Fluorescence OLEDs | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Choi, Dong Hoon | - |
dc.identifier.doi | 10.1002/chem.202002655 | - |
dc.identifier.scopusid | 2-s2.0-85093973970 | - |
dc.identifier.wosid | 000584293900001 | - |
dc.identifier.bibliographicCitation | CHEMISTRY-A EUROPEAN JOURNAL, v.26, no.69, pp.16383 - 16391 | - |
dc.relation.isPartOf | CHEMISTRY-A EUROPEAN JOURNAL | - |
dc.citation.title | CHEMISTRY-A EUROPEAN JOURNAL | - |
dc.citation.volume | 26 | - |
dc.citation.number | 69 | - |
dc.citation.startPage | 16383 | - |
dc.citation.endPage | 16391 | - |
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.journalWebOfScienceCategory | Chemistry, Multidisciplinary | - |
dc.subject.keywordPlus | LIGHT-EMITTING-DIODES | - |
dc.subject.keywordPlus | FACILE SYNTHESIS | - |
dc.subject.keywordPlus | PHOSPHINE-OXIDE | - |
dc.subject.keywordPlus | PHOSPHORESCENT | - |
dc.subject.keywordPlus | LIFETIME | - |
dc.subject.keywordPlus | DEGRADATION | - |
dc.subject.keywordPlus | DESIGN | - |
dc.subject.keywordPlus | GUEST | - |
dc.subject.keywordPlus | MECHANISMS | - |
dc.subject.keywordPlus | STABILITY | - |
dc.subject.keywordAuthor | bipolar host materials | - |
dc.subject.keywordAuthor | density functional calculations | - |
dc.subject.keywordAuthor | fluorescence | - |
dc.subject.keywordAuthor | high external quantum efficiency | - |
dc.subject.keywordAuthor | organic light-emitting diodes | - |
dc.subject.keywordAuthor | thermally activated delayed fluorescence | - |
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