Spiro derivatives as electron-blocking materials for highly stable OLEDs

Baohua Hu, Zhenhua Ci, Li Liang, Chong Li, Wei Huang, Musubu Ichikawa

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

In this study, we introduced N-([1,1′-biphenyl]-2-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl) spiro[dibenzo[a,d] [7]annulene-5,9′-fluoren]-2′-amine (BFS2A) and N-([1,1′-biphenyl] -2-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl)spiro[dibenzo[a,d][7]annulene-5,9′-fluoren]-3-amine (BFS3A) as electron-blocking materials in organic light-emitting diodes (OLEDs). We verified that these materials have suitable optical properties as well as good electrochemical and thermal stability. Devices based on these materials also exhibited excellent charge balance, which corresponded to good device lifetime. Although BFS2A and BFS3A have similar molecular structures, OLEDs with these compounds as electron-blocking materials exhibited different performance, which we attributed to the differences in the modifying positions of the spiro backbone.

Original languageEnglish
Article number105879
JournalOrganic Electronics
Volume86
DOIs
StatePublished - Nov 2020

Keywords

  • Charge balance
  • Electroluminescent properties
  • Electron-blocking
  • Lifetime
  • Organic light-emitting diodes

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