Copolyfluorenes containing pendant bipolar carbazole and 1,2,4-triazole groups: Synthesis, characterization, and optoelectronic applications

Chia Shing Wu, Yun Chen

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Three novel copolyfluorenes (P1-P3) containing pendant bipolar groups (2.5-7.7 mol %), directly linked hole-transporting carbazole and electron-transporting aromatic 1,2,4-triazole, were synthesized by the Suzuki coupling reaction and applied to enhance emission efficiency of polymer light-emitting diodes based on conventional MEH-PPV. The bipolar groups not only suppress undesirable green emission of polyfluorene under thermal annealing, but also promote electron- and hole-affinity of the resulting copolyfluorenes. Blending the bipolar copolyfluorenes with MEH-PPV results in significant enhancement of device performance [ITO/PEDOT:PSS/MEH-PPV+P1, P2 or P3/Ca(50 nm)/Al(100 nm)]. The maximum luminance and luminance efficiency were enhanced from 3230 cd/m2 and 0.29 cd/A of MEH-PPV-only device to 15,690 cd/m2 and 0.81 cd/A (blend device with MEH-PPV/P3 = 94/6 containing about 0.46 wt % of pendant bipolar residues), respectively. Our results demonstrate the efficacy of the bipolar copolyfluorenes in enhancing emission efficiency of MEH-PPV.

Original languageEnglish
Pages (from-to)3928-3938
Number of pages11
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume49
Issue number18
DOIs
Publication statusPublished - 2011 Sep 15

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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