Synthesis and light-emitting properties of difunctional dendritic distyrylstilbenes

Chi Chung Kwok, Ricky M S WONG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

A novel series of poly(benzyl ether) type dendritic distyrylbenzenes beating various electron or hole affinitive moieties including 1,3,4-oxadiazole, cyano, and propoxy groups on the outer surface of the first- and second-generations dendritic wedges have been synthesized for blue-light emission. Both theoretical and optical studies show that incorporation of the surface functionalized dendritic wedges into the nonconjugated meta positions of a distyrylstilbene skeleton does not disrupt the coplanarity of the π-conjugated core. Excitation of the surface functionalized dendritic wedges leads to substantial energy transfer from the dendritic wedges to the emissive core (up to 59%). Importantly, all the dendritic distyrylstilbenes show very high fluorescence quantum yields (over 93%). Single-layer light-emitting diodes (LED) using dendritic distyrylstilbene (DSB) doped poly(N-vinylcarbazole) (PVK) film as an emissive layer with structure of (ITO/DSB:PVK/Al) have been fabricated and investigated. The emission wavelengths and spectral features are very similar among the solution emission, solid-state photoluminescence, and electroluminescence spectra. The device performance of the first-generation dendritic DSB doped single-layer LEDs is generally superior to that of the corresponding second-generation dendrimer based devices. In addition, the propoxy surface functionalized dendritic DSB devices consistently show the best device performance and relative stability among the others.

Original languageEnglish
Pages (from-to)6821-6830
Number of pages10
JournalMacromolecules
Volume34
Issue number19
DOIs
Publication statusPublished - 11 Sep 2001

Scopus Subject Areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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