Carbazole end-capped pyrene starburst with enhanced electrochemical stability and device performance

Feng Liu, Jian Hua Zou, Qi Yuan He, Chao Tang, Ling Hai Xie, Bo Peng, Wei Wei, Yong Cao, Wei Huang

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Carbazole end-capped starburst molecule based on pyrene core "4CzFP" was synthesized and characterized. The starburst material shows good film-forming ability and bright blue fluorescence. In cyclic voltammetry test, 4CzFP shows a high highest occupied molecular orbital energy level of -5.26 eV, indicating it has good hole-injection ability. The material is quite stable under series of cyclic voltammetry scans, implying its good electrochemical stability. Single-layered electroluminescent device takes on stable blue emission with a peak current efficiency of 0.84 cd/A. Double-layered device by adding Poly(N-vinylcarbazole) (PVK) as a hole-injection layer does not show any improvement, indicating that 4CzFP could be efficiently used as the hole-injection/light-emitting layer. The device performance is largely improved by adding a thin TPBI electron-injection/transporting layer. The peak efficiency reaches 3.28 cd/A and the maximum brightness is over 2200 cd/m 2.

Original languageEnglish
Pages (from-to)4943-4949
Number of pages7
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume48
Issue number22
DOIs
StatePublished - 15 Nov 2010
Externally publishedYes

Keywords

  • conjugated materials
  • electrochemistry
  • electroluminescence
  • functionalization of polymers
  • light-emitting diodes (LED)
  • pyrene
  • star polymers
  • starbursts

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