Enhanced carrier balance by organic salt doping in single-layer polymer light-emitting devices

Dong Hyun Lee, Jong Hyeok Park, Heeyeop Chae, Sung M. Cho

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


We have showed that the doping of an organic salt into a PVK-based polymer emissive layer could enhance the carrier balance greatly to result in higher luminance and luminous efficiency. It is found out that the salt-doped devices show the similar operating characteristics of frozen-junction light-emitting electrochemical cells (LECs). With the salt doping of 0.6 wt.% and an appropriate salt activation process, the fabricated PVK-based polymer light-emitting diodes (PLEDs) shows the luminous efficiency of 15 cd/A at the highest luminance of 55,000 cd/m2 even without an electron-injecting LiF layer. Due to the enhanced carrier balance, the luminous efficiency is found to be maintained from the turn-on voltage to the voltage for the maximum luminance, which means a linear relationship between luminance and current density.

Original languageEnglish
Pages (from-to)1345-1351
Number of pages7
JournalOrganic Electronics
Issue number7
Publication statusPublished - 2009 Nov

Bibliographical note

Funding Information:
This work was supported by a grant from Gyeonggi Province through the GRRC (Gyeonggi Regional Research Center) program in Sungkyunkwan University.

All Science Journal Classification (ASJC) codes

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


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