Diphenylamino end-capped oligofluorenes with enhanced functional properties for blue light emission: Synthesis and structure-property relationships

Zhong Hui Li, Ricky M S WONG*, Ye Tao, Jianping Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)

Abstract

A novel series of monodisperse asymmetrically and symmetrically substituted diphenylamino end-capped oligofluorenes, OF(2)-NPhR, R = H or An (An = 9-anthryl) and OF(n)-NPh, n = 2-4, has been synthesized by a convergent approach using palladium-catalyzed Suzuki cross-coupling. End-capping of oligofluorenes with diphenylamino group(s) has been shown to offer advantages in terms of lowering their first ionization potentials, enhancing thermal stability, and inducing good amorphous morphological stability. By tuning the number of diphenylamino end-caps and the chain length, the optimal conjugated length for optical and luminescence properties has been determined. Of all the hitherto reported oligofluorenes capable of serving as non-doped blue emitters, OF(3)-NPh, with an optimal conjugated length, exhibits some of the best hole-transport and blue-emitting properties. A maximum luminance of 7500 cd m-2 and a luminance efficiency up to 1.8 cd A-1 have been achieved.

Original languageEnglish
Pages (from-to)3285-3293
Number of pages9
JournalChemistry - A European Journal
Volume11
Issue number11
DOIs
Publication statusPublished - 20 May 2005

Scopus Subject Areas

  • Catalysis
  • Organic Chemistry

User-Defined Keywords

  • Cyclic voltammetry
  • Enhanced hole-injection/transport properties
  • Fluorescence
  • Light-emitting materials
  • Oligofluorenes

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