Dicarbazolyldicyanobenzenes as thermally activated delayed fluorescence emitters: Effect of substitution position on photoluminescent and electroluminescent properties

Bo Li, Hiroko Nomura, Hiroshi Miyazaki, Qisheng Zhang, Kou Yoshida, Yoshinori Suzuma, Akihiro Orita, Junzo Otera, Chihaya Adachi

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

We demonstrate two efficient blue-green thermally activated delayed fluorescence (TADF) compounds comprising a dimeric phenylcarbazole and four cyano substituents on the phenyl rings. A comparison of the 2,6-dicyano- substituted derivative (26IPNDCz) with the 3,5-dicyano-substituted derivative (35IPNDCz) shows that 26IPNDCz provides a larger dihedral angle and a lower decrease in the energy difference between the first singlet and triplet excited states (ΔEST) and the TADF lifetime. An organic light-emitting diode based on 26IPNDCz afforded an external quantum efficiency of 10% with reduced efficiency roll-off.

Original languageEnglish
Pages (from-to)319-321
Number of pages3
JournalChemistry Letters
Volume43
Issue number3
DOIs
Publication statusPublished - Mar 11 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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