Synthesis and characterization of fluorene-based copolymers as electron-transporting materials for PLEDs

Ho Ik Ahn, Jong Sik Moon, Won Geun Kim, Mohammad Afsar Uddin, Jongwan Choi, Chuntae Kim, Han Young Woo, Nakjoong Kim, Jin Woo Oh

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Abstract Owing to their low cost, easy processing, and the possibility of flexible fabrication, polymer light-emitting diodes (PLEDs) are emerging as an important class of materials. Despite promising characteristics, the relatively easy ionization of the well-known low-work-function cathodes such as Ca and Ba prevents the full usage of these materials. Herein, we report the syntheses of three alcohol-soluble conjugated polymers with different conjugation lengths and electron affinities as electron injection and transport materials for PLEDs: poly[9,9-bis(2-dihexylaminoethoxy)fluorene-co-tetrafluorobenzene] (PFOH-1), poly[9,9-bis(2-dihexylaminoethoxy)fluorene-co-thiophene] (PFOH-2), and poly[9,9-bis(2-dihexylaminoethoxy)fluorene-co-benzo-thiadiazole] (PFOH-3). For comparison, devices using Al, Ca, and Al cathodes were also fabricated. The device based on the Al cathode showed lower performance with a luminescence efficiency of 0.93 cd/A and a luminance of 248 cd/m2; that based on the low-work-function metal Ca as the cathode showed a near-threefold increase in luminescence efficiency at 2.51 cd/A and brightness at 856 cd/m2 owing to greatly enhanced electron injection from the cathode; and the device employing the PFOH-3/Al cathode exhibited a luminescence efficiency of 2.35 cd/A and a brightness of 667 cd/m2 at a current density of 35 mA/cm2, which is comparable with the performance of the device with the Ca cathode.

Original languageEnglish
Article number3130
Pages (from-to)206-211
Number of pages6
JournalOrganic Electronics
Publication statusPublished - 2015 Jul 3
Externally publishedYes


  • Alcohol-soluble
  • Electron-transporting materials
  • Fluorene-based copolymers
  • PLEDs

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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