Experimental and theoretical demonstration on the transport properties of fused ring host materials for organic light-emitting diodes

S. C. Tse*, Shu Kong SO, M. Y. Yeung, C. F. Lo, S. W. Wen, C. H. Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The charge transport properties of three tertiary-butyl (t-Bu) substituted anthracene derivatives (ADN), critical blue host materials for organic light-emitting diodes (OLEDs), have been investigated experimentally and computationally. From time-of-flight (TOF) measurements, all ADN compounds exhibit ambipolar characters. The hole and electron mobilities are in the range (1-5) × 10-7cm2V-1 s-1 under an external applied field of about 1MVcm-1. Un-substituted ADN has the highest carrier mobilities while heavily t-Bu substituted ADN has the least. The electron and hole conducting properties of are consistent with ab initio calculation, which indicates that the frontier orbitals are localized mainly on the anthracene moiety. t-Bu substitutions in ADN increase the hopping path lengths among the molecules and hence reduce the electron and hole mobilities. The results demonstrate that t-Bu substitution is an effective means of engineering the conductivity of organic charge transporter for OLED applications.

Original languageEnglish
Pages (from-to)555-557
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
Volume45
Issue number1 B
DOIs
Publication statusPublished - 20 Jan 2006

Scopus Subject Areas

  • Engineering(all)
  • Physics and Astronomy(all)

User-Defined Keywords

  • Ambipolar
  • Anthracene derivative
  • Carrier mobility

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