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*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

17 Citations (Scopus)

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/m2.
Original languageEnglish
Pages (from-to)4943-4949
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume48
Issue number22
Online published5 Oct 2010
DOIs
Publication statusPublished - 15 Nov 2010
Externally publishedYes

Research Keywords

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

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