High-Efficiency Sky Blue to Ultradeep Blue Thermally Activated Delayed Fluorescent Diodes Based on Ortho-Carbazole-Appended Triarylboron Emitters: Above 32% External Quantum Efficiency in Blue Devices

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dc.contributor.authorLee, Young Hoonko
dc.contributor.authorPark, Sungheeko
dc.contributor.authorOh, Jihunko
dc.contributor.authorWoo, Seung-Jeko
dc.contributor.authorKumar, Ajayko
dc.contributor.authorKim, Jang-Jooko
dc.contributor.authorJung, Jaehoonko
dc.contributor.authorYoo, Seunghyupko
dc.contributor.authorLee, Min Hyungko
dc.date.accessioned2018-10-19T00:30:35Z-
dc.date.available2018-10-19T00:30:35Z-
dc.date.created2018-09-19-
dc.date.created2018-09-19-
dc.date.created2018-09-19-
dc.date.issued2018-09-
dc.identifier.citationADVANCED OPTICAL MATERIALS, v.6, no.17-
dc.identifier.issn2195-1071-
dc.identifier.urihttp://hdl.handle.net/10203/245900-
dc.description.abstractA novel approach to highly efficient, blue thermally activated delayed fluorescent (TADF) emitters is proposed. A series of ortho-carbazole-appended triarylboron compounds (1-5) are prepared with various substituents, including tert-Bu, Me, and OMe, introduced to the carbazole donor and/or to the dimesitylphenylboron (PhBMes(2)) acceptor. Depending on the substituents on the donor and/or acceptor moieties, the emission color is finely tuned over the entire blue region from sky blue to ultradeep blue. Retention of a twisted donor (D)-acceptor (A) structure enabled by the ortho D-A connectivity and bulky triarylboron leads to small energy splitting (Delta E-ST) between singlet and triplet excited states, resulting in very efficient TADF. High-efficiency blue TADF organic light-emitting diodes (OLEDs) are realized by using the proposed ortho D-A compounds as emitters. Among them, the blue OLEDs incorporating a BuCzMeoB (2) emitter exhibit a very high external quantum efficiency (EQE) of 32.8% at Commission Internationale de l'Eclairage (CIE) color coordinates of (0.135, 0.266). The high device efficiency is attributed to both the high photoluminescence quantum yield of 2 in a given host film (93%) and the high horizontal transition dipole ratio (Theta) of 0.76. Ultradeep blue OLEDs with a record-high efficiency are also fabricated with a CzOMeoB (5) emitter, exhibiting an EQE of 14.9% at CIE coordinates of (0.151, 0.058).-
dc.languageEnglish-
dc.publisherWILEY-V C H VERLAG GMBH-
dc.titleHigh-Efficiency Sky Blue to Ultradeep Blue Thermally Activated Delayed Fluorescent Diodes Based on Ortho-Carbazole-Appended Triarylboron Emitters: Above 32% External Quantum Efficiency in Blue Devices-
dc.typeArticle-
dc.identifier.wosid000443548600015-
dc.identifier.scopusid2-s2.0-85052725537-
dc.type.rimsART-
dc.citation.volume6-
dc.citation.issue17-
dc.citation.publicationnameADVANCED OPTICAL MATERIALS-
dc.identifier.doi10.1002/adom.201800385-
dc.contributor.localauthorYoo, Seunghyup-
dc.contributor.nonIdAuthorLee, Young Hoon-
dc.contributor.nonIdAuthorOh, Jihun-
dc.contributor.nonIdAuthorWoo, Seung-Je-
dc.contributor.nonIdAuthorKumar, Ajay-
dc.contributor.nonIdAuthorKim, Jang-Joo-
dc.contributor.nonIdAuthorJung, Jaehoon-
dc.contributor.nonIdAuthorLee, Min Hyung-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorblue devices-
dc.subject.keywordAuthorOLEDs-
dc.subject.keywordAuthorortho donor-acceptor compounds-
dc.subject.keywordAuthorTADF emitters-
dc.subject.keywordAuthorthermally activated delayed fluorescence-
dc.subject.keywordAuthortriarylboron-
dc.subject.keywordPlusLIGHT-EMITTING-DIODES-
dc.subject.keywordPlusMOLECULAR DESIGN-
dc.subject.keywordPlusPURE BLUE-
dc.subject.keywordPlusPHOSPHINE-OXIDE-
dc.subject.keywordPlusROLL-OFF-
dc.subject.keywordPlusELECTROLUMINESCENCE-
dc.subject.keywordPlusEMISSION-
dc.subject.keywordPlusSTRATEGY-
dc.subject.keywordPlusOLEDS-
dc.subject.keywordPlusPERFORMANCE-
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