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

Michael Y. Wong, Simonas Krotkus, Graeme Copley, Wenbo Li, Caroline Murawski, David Hall, Gordon J. Hedley, Marie Jaricot, David B. Cordes, Alexandra M.Z. Slawin, Yoann Olivier, David Beljonne, Luca Muccioli, Monica Moral, Juan Carlos Sancho-Garcia, Malte C. Gather, Ifor D.W. Samuel, Eli Zysman-Colman

Research output: Contribution to journalArticlepeer-review

Abstract

A series of four novel deep-blue to sky-blue thermally activated delayed fluorescence (TADF) emitters (2CzdOXDMe, 2CzdOXD4MeOPh, 2CzdOXDPh, and 2CzdOXD4CF 3 Ph) 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 (ΔE ST ) between 0.25 and 0.46 eV resulting in delayed components ranging from 4.8 to 25.8 ms. The OLED device with 2CzdOXD4CF 3 Ph 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).

Original languageEnglish
Pages (from-to)33360-33372
Number of pages13
JournalACS Applied Materials and Interfaces
Volume10
Issue number39
DOIs
Publication statusPublished - 3 Oct 2018
Externally publishedYes

Keywords

  • blue emitters
  • DFT calculations
  • organic light emitting diodes
  • oxadiazoles
  • thermally activated delayed fluorescence

Fingerprint Dive into the research topics of 'Deep-Blue Oxadiazole-Containing Thermally Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes'. Together they form a unique fingerprint.

Cite this