Deep-Blue Oxadiazole-Containing Thermally Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes

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Title: Deep-Blue Oxadiazole-Containing Thermally Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes
Authors: Wong, Michael Y. | Krotkus, Simonas | Copley, Graeme | Li, Wenbo | Murawski, Caroline | Hall, David | Hedley, Gordon J. | Jaricot, Marie | Cordes, David B. | Slawin, Alexandra M.Z. | Olivier, Yoann | Beljonne, David | Muccioli, Luca | Moral, Monica | Sancho-Garcia, Juan-Carlos | Gather, Malte C. | Samuel, Ifor D.W. | Zysman-Colman, Eli
Research Group/s: Química Cuántica
Center, Department or Service: Universidad de Alicante. Departamento de Química Física
Keywords: Thermally activated delayed fluorescence | Organic light emitting diodes | Oxadiazoles | Blue emitters | DFT calculations
Knowledge Area: Química Física
Issue Date: 7-Sep-2018
Publisher: American Chemical Society
Citation: ACS Applied Materials & Interfaces. 2018, 10(39): 33360-33372. doi:10.1021/acsami.8b11136
Abstract: A series of four novel deep-blue to sky-blue thermally activated delayed fluorescence (TADF) emitters (2CzdOXDMe, 2CzdOXD4MeOPh, 2CzdOXDPh, and 2CzdOXD4CF3Ph) have been synthesized and characterized. These oxadiazole-based emitters demonstrated bluer emission compared with the reference emitter 2CzPN thanks to the weaker acceptor strength of the oxadiazole moieties. The oxadiazole compounds doped in hosts (mCP and PPT) emitted from 435 to 474 nm with photoluminescence quantum yields ranging from 14–55%. The emitters possess singlet–triplet excited-state energy gaps (ΔEST) between 0.25 and 0.46 eV resulting in delayed components ranging from 4.8 to 25.8 ms. The OLED device with 2CzdOXD4CF3Ph shows a maximum external quantum efficiency of 11.2% with a sky-blue emission at CIE of (0.17, 0.25), while the device with 2CzdOXD4MeOPh shows a maximum external quantum efficiency of 6.6% with a deep-blue emission at CIE of (0.15, 0.11).
Sponsor: E.Z.-C. thanks the University of St Andrews for support. We are grateful to the EPSRC for financial support (grants EP/P010482/1, EP/J01771X, and EP/J00916). I.D.W.S. is a Royal Society Wolfson Research Merit Award Holder. We thank the EPSRC UK National Mass Spectrometry Facility at Swansea University for analytical services. C.M. acknowledges funding by the European Commission through a Marie Skłodowska Curie Individual Fellowship (No. 703387). G.C. acknowledges funding by the European Commission through a Marie Skłodowska Individual Fellowship (No. 799302).
URI: http://hdl.handle.net/10045/81447
ISSN: 1944-8244 (Print) | 1944-8252 (Online)
DOI: 10.1021/acsami.8b11136
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 American Chemical Society
Peer Review: si
Publisher version: https://doi.org/10.1021/acsami.8b11136
Appears in Collections:INV - QC - Artículos de Revistas

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