Carrier transport in molecularly doped organic materials

Shu Kong SO, K. K. Tsung

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


This contribution examines in details the effects of dopants on the hole transporting properties of N,N′- diphenyl-N,N′-bis (1-naphthyl) (1,1′-biphenyl)- 4,4′diamine (NPB). Dopants for NPB are copper phthalocyanine (CuPc), 4-(dicyanomethylene)-2-methyl-6-(pdimethylaminostyryle)- 4H-pyran (DCM1), 4-dicyanomethylene-2-methyl- 6-[2-(2,3,6,7-tetra-hydro-1H,5H- benzo[ij] quinolizin-8-yl)vinyl]-4H-pyran (DCM2), 2-(4-biphenyl0-5-(4- tertbutylphenyl)-1,3,4-oxadiazole (tBu-PBD) and 2,9-dimethyl-4, 7-diphenyl-1,10-phenanthroline (BCP). The effects of these dopants on the hole transport of NPB will be presented. Generally, the dopant molecules behave like hole traps or scatterers. Their detailed behaviors are determined by their highest occupied molecular orbitals relative to that of NPB. Traps are found to induce significant reduction in hole mobility. However, hole scatterers only alter the mobility slightly. Two different underlying charge transport mechanisms are proposed and then it is further examined by temperature dependent measurements.

Original languageEnglish
Title of host publicationOrganic Light Emitting Materials and Devices XII
Publication statusPublished - 2008
EventOrganic Light Emitting Materials and Devices XII - San Diego, CA, United States
Duration: 10 Aug 200812 Aug 2008

Publication series

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


ConferenceOrganic Light Emitting Materials and Devices XII
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

  • Doping
  • Organic charge transporters
  • Time-of-flight measurement


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