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
Deep-Blue Oxadiazole-Containing Thermally Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes
ACS Applied Materials & Interfaces. 2018, 10(39): 33360-33372. doi:10.1021/acsami.8b11136
URI: http://hdl.handle.net/10045/81447
DOI: 10.1021/acsami.8b11136
ISSN: 1944-8244 (Print)
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).
Keywords:Thermally activated delayed fluorescence, Organic light emitting diodes, Oxadiazoles, Blue emitters, DFT calculations
American Chemical Society
info:eu-repo/semantics/article