Efficient Organic Light-Emitting Diode through Triplet Exciton Reharvesting by Employing Blended Electron Donor and Acceptor as the Emissive Layer

Lu Zhang, Chao Cai, King Fai Li, Hoi Lam TAM, Kin Long Chan, Kok Wai CHEAH*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

A blended bimolecular exciplex formation was demonstrated between two individual donor and acceptor molecules, which are tris(4-carbazoyl-9-ylphenyl)amine (TCTA) and 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine (Tm3PyBPZ). The photoluminescence spectrum of the exciplex in the solid state showed an emission with a peak around 514 nm (∼2.49 eV). By applying this exciplex as an emitting layer, a highly efficient all-fluorescent organic lighting emitting diode with maximum efficiencies of 13.1% and 53.4 lm/W can be realized under an extremely low turn-on voltage of only 2.4 V. The thermally activated delayed fluorescence (TADF) process is believed to be responsible for the excellent device performance.

Original languageEnglish
Pages (from-to)24983-24986
Number of pages4
JournalACS applied materials & interfaces
Volume7
Issue number45
DOIs
Publication statusPublished - 3 Nov 2015

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • intermolecular exciplex
  • organic light-emitting diode (OLED)
  • thermally activated delayed fluorescence (TADF)
  • triplet exciton reharvesting
  • weak coupled donor and acceptor

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