Synthesis and opto-electrical properties of stellar polyfluorene derivatives containing polyhedral oligomeric silsesquioxanes as the center core

Kuei Bai Chen, Hung Yi Chen, Sheng-Hsiung Yang, Chain-Shu Hsu*

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Three polyfluorene derivatives (P1-P3) emitting blue, green and red light were prepared via a Suzuki coupling method. Polyhedral oligomeric silsesquioxanes (POSS) were integrated into the center core of the derivatives to create stellar light-emitting polymers (POSS-P1-POSS-P3). The glass-transition and decomposition temperatures were raised after introducing POSS moieties. The starlike polymers showed a reduced emissive band at 540 nm when annealing at 200 °C. The result implies that integrated POSS at the center core suppresses the keto effect generally occurring for polyfluorenes. Double-layer light-emitting devices of indium tin oxide/ poly(ethylenedioxythiophene)/polymer/Ca/Al were fabricated to evaluate polymer potential. Compared with pristine polymers, the maximum brightness and the current efficiency of devices using POSS-containing polymers as active layers were enhanced. A blending method using P1 or POSS-P1 as the host matrix further improved device performance.

Original languageEnglish
Pages (from-to)237-245
Number of pages9
JournalJournal of Polymer Research
Volume13
Issue number3
DOIs
StatePublished - 1 Jun 2006

Keywords

  • Keto effect
  • Polyfluorene
  • Silsesquioxanes

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