Organic light-emitting diodes based on a columnar liquid-crystalline perylene emitter

Changmin Keum, David Becker, Emily Archer, Harald Bock, Heinz Kitzerow, Malte C. Gather, Caroline Murawski

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Liquid crystalline materials possess great potential as emitters in organic light-emitting diodes (OLEDs) due to their self-assembling property, which may lead to anisotropic films and improved charge transport. Here, we investigate key photophysical properties of the columnar liquid crystalline emitter perylene-3,4,9,10-tetracarboxylic tetraethyl ester (PTCTE) and implement the material into OLEDs. We find that vacuum-deposited PTCTE films exhibit preferential horizontal orientation of the transition dipole moment. Embedding the emitter into different host materials leads to increased photoluminescence quantum yield but reduces molecular orientation compared to the neat film. OLEDs containing PTCTE doped into an exciplex-forming co-host achieve very high luminance exceeding 10,000 cd m-2 at 5.7 V, which is amongst the best performance of OLEDs based on columnar liquid crystalline emitters reported so far.
Original languageEnglish
Article number2000414
Number of pages7
JournalAdvanced Optical Materials
Volume8
Issue number17
Early online date15 Jun 2020
DOIs
Publication statusPublished - 4 Sept 2020

Keywords

  • OLED
  • Discotic liquid crystals
  • Perylene
  • Transition dipole moment orientation
  • High brightness

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