Can an organic phosphorescent dye act as a charge transporter?

W. H. Choi, C. H. Cheung, Shu Kong SO*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

17 Citations (Scopus)


The hole transport property of a widely used phosphorescent dye, tris(2-phenylpyridine) iridium or Ir(ppy)3 was investigated by thin film transistor (TFT) technique. The field effect (FE) mobility of Ir(ppy)3 was found to be 1.7 × 10-5 cm2 V-1s-1. This value is actually comparable to NPB and CBP, two popular hole transporting materials for fluorescent and phosphorescent organic light-emitting diodes (FOLED and POLED), respectively. In addition, temperature dependent measurements were carried out to study the energetic disorder (σ) of Ir(ppy)3. The extracted σ ∼ 88 meV is comparable to those of other common amorphous organic hole transporters, which are in the range of 80-90 meV. Our findings indicate that the dye can directly act as a hole transporting component in POLEDs. Crown

Original languageEnglish
Pages (from-to)872-875
Number of pages4
JournalOrganic Electronics
Issue number5
Publication statusPublished - May 2010

Scopus Subject Areas

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

User-Defined Keywords

  • Charge transport
  • Organic light-emitting diodes
  • Phosphorescent dye
  • Thin film transistor


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