Charge injection and transport in spiro-linked arylamine compounds

W. H. Choi, Shu Kong SO

Research output: Chapter in book/report/conference proceedingConference proceedingpeer-review

4 Citations (Scopus)


We use dark-injection space-charge-limited current (DI-SCLC) and admittance spectroscopy (AS) to study charge injection and transport properties of spiro-linked arylamine compounds. Examples are spiro-linked TPD and spiro-linked NPB which are both important amorphous hole transporters for organic light-emitting diodes (OLEDs). With PEDOT:PSS as the hole-injection layer, the contact is demonstrated to be generally Ohmic. Both techniques can be used to measure the carrier mobilities of thick films (>μm) of spiro-compounds. DI-SCLC can be viewed as a pulse technique whereas AS can be treated as an ac technique. For the hole mobilities evaluation of the spiro-compounds, both techniques are in general agreement to each other. However, for the case of the thinner films of less than 1μm, AS is superior over the DI-SCLC technique. The advantages of AS will be highlighted. It appears that AS is broadly applicable to characterize transport properties of organic thin films.

Original languageEnglish
Title of host publicationOrganic Light Emitting Materials and Devices XIII
Publication statusPublished - 2009
EventOrganic Light Emitting Materials and Devices XIII - San Diego, CA, United States
Duration: 2 Aug 20094 Aug 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceOrganic Light Emitting Materials and Devices XIII
Country/TerritoryUnited States
CitySan Diego, CA

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

User-Defined Keywords

  • Admittance spectroscopy
  • Carrier injection
  • Carrier mobility
  • Charge transport
  • Dark-injection space-charge-limited current
  • Time-of-flight


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