Transport and luminescence in naphthyl phenylamine model compounds

K. L. Tong, S.K. So*, H. F. Ng, L. M. Leung, M. Y. Yeung, C. F. Lo

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

25 Citations (Scopus)


The effects of polar side groups (methoxy, fluoro, and chloro substitution) on the transport and luminescence properties of a series of naphthyl phenylamine (NPA) compounds were examined. The compounds are (i) N,N-diphenyl-1-naphthylamine, (ii) N-(4-methoxyphenyl),N′-pheny1-1- naphthylamine, (iii) N-(4-chlorophenyl),N′-phenyl-l-naphthylamine, and (iv) N-(4-fluorophenyl),N-phenyl-l-naphthylamine. Time-of-flight measurements were used to measure the hole mobilities of the NPA compounds. The hole mobilities were found to correlate with the dipole moments of the compounds. The least polar compound N,N′-diphenyl-1-naphthylamine has the highest mobility in the range of 0.5-2 × 10-4 cm2 V -1 s-1, whereas the most polar compound N-(4-chlorophenyl),N′-phenyl-1-naphthylamine has the lowest mobility in the range of 0.2-2 × 10-6 cm2 V-1 s -1 at room temperature. The dipolar disorder model proposed by Dieckmann and Young is found to be applicable to describe the data. The NPA compounds were further incorporated into a multilayer organic light-emitting diode (OLED) as the light-emitting layer. The OLEDs emit in the range 420-440 nm, and the polar side groups appear to have no clear influence on the emission wavelength of the molecules in solid state.

Original languageEnglish
Pages (from-to)199-203
Number of pages5
JournalSynthetic Metals
Issue number1-3
Publication statusPublished - 7 Dec 2004
EventSupramolecular Approaches to Organic Electronics and Nanotechn. - Strasbourg, France
Duration: 24 May 200428 May 2004

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

User-Defined Keywords

  • Carrier mobility
  • Organic light-emitting diode
  • Phenylamine


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