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The effect of the electron-donor ability on the OLED efficiency of twisted donor-acceptor type emitters
DC Field | Value | Language |
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dc.contributor.author | Yang, Dongwook | - |
dc.contributor.author | Kim, Jae-Min | - |
dc.contributor.author | Huh, Jin-Suk | - |
dc.contributor.author | Kim, Jang-Joo | - |
dc.contributor.author | Hong, Jong-In | - |
dc.date.accessioned | 2022-05-20T00:47:39Z | - |
dc.date.available | 2022-05-20T00:47:39Z | - |
dc.date.created | 2021-07-27 | - |
dc.date.created | 2021-07-27 | - |
dc.date.created | 2021-07-27 | - |
dc.date.created | 2021-07-27 | - |
dc.date.created | 2021-07-27 | - |
dc.date.issued | 2021-08 | - |
dc.identifier.citation | Organic Electronics, Vol.95, p. 106187 | - |
dc.identifier.issn | 1566-1199 | - |
dc.identifier.uri | https://hdl.handle.net/10371/179921 | - |
dc.description.abstract | Two twisted donor-acceptor (D-A) chemical structures, CCDMB and PCDMB, were developed as a new class of thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs). Two emitters consist of 3-substituted carbazole as a first donor and trivalent boron as an electron acceptor in common, and carbazole and phenoxazine as second donors with different electron donor ability. While PCDMB with a strong phenoxazine donor decreased the lowest singlet excited state (S1) level and thus showed a small singlet-triplet energy difference (ΔEST) value of 0.13 eV, resulting in effective reverse intersystem crossing (RISC), however, CCDMB with a weak donor showed a large ΔEST value of 0.21 eV. Efficient triplet harvesting of PCDMB was confirmed by a delayed component in transient PL decay curves of 25 wt% PCDMB-doped bis[2-(diphenylphosphino)phenyl] ether oxide (DPEPO) films. OLED devices with a CCDMB emitter showed deep-blue emission with Commission Internationale de lÉclairage (CIE) of (0.16, 0.12) but a low maximum EQE of 5.5%, indicative of insufficient triplet harvesting. PCDMB-based devices showed green emission with CIE of (0.21, 0.45) and a high maximum EQE of 22.3%. Our study revealed the effect of the electron donor ability of structurally similar emitters on ΔEST values, triplet harvesting, and device efficiency. | - |
dc.language | 영어 | - |
dc.publisher | Elsevier B.V. | - |
dc.title | The effect of the electron-donor ability on the OLED efficiency of twisted donor-acceptor type emitters | - |
dc.type | Article | - |
dc.identifier.doi | 10.1016/j.orgel.2021.106187 | - |
dc.citation.journaltitle | Organic Electronics | - |
dc.identifier.scopusid | 2-s2.0-85106862243 | - |
dc.citation.startpage | 106187 | - |
dc.citation.volume | 95 | - |
dc.description.isOpenAccess | N | - |
dc.contributor.affiliatedAuthor | Kim, Jang-Joo | - |
dc.contributor.affiliatedAuthor | Hong, Jong-In | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.subject.keywordAuthor | Electron-donor ability | - |
dc.subject.keywordAuthor | Organic light emitting diodes | - |
dc.subject.keywordAuthor | Thermally activated delayed fluorescence | - |
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