Flexible and metal-free light-emitting electrochemical cells based on graphene and PEDOT-PSS as the electrode materials

Piotr Matyba, Hisato Yamaguchi, Manish Chhowalla, Nathaniel D. Robinson, Ludvig Edman

Research output: Contribution to journalArticle

90 Citations (Scopus)


We report flexible and metal-free light-emitting electrochemical cells (LECs) using exclusively solution-processed organic materials and illustrate interesting design opportunities offered by such conformable devices with transparent electrodes. Flexible LEC devices based on chemically derived graphene (CDG) as the cathode and poly(3,4-ethylenedioxythiophene) mixed with poly(styrenesulfonate) as the anode exhibit a low turnon voltage for yellow light emission (V - 2.8 V) and a good efficiency 2.4 (4.0) cd/A at a brightness of 100 (50) cd/m2. We also find that CDG is electrochemically inert over a wide potential range (+1.2 to -2.8 V vs ferrocene/ferrocenium) and exploit this property to demonstrate planar LEC devices with CDG as both the anode and the cathode.

Original languageEnglish
Pages (from-to)574-580
Number of pages7
JournalACS nano
Issue number1
Publication statusPublished - Jan 25 2011



  • Doping
  • Flexible
  • Graphene
  • Light-emitting electrochemical cell
  • Metal-free
  • P-n junction
  • Solution processing
  • Superyellow

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this