Luminescence properties of poly[l,4-phenyIenevinylene-c0-(2,3,5,6tetramethyl-l,4-phenylenevinylene)] - Improved EL efficiency through partial disruption of main chain -conjugation by substituents

Sung Jae Cluing, Dong Won Lee, Dong Keim Oh, Cheol Eui Lee, I. Jimg-Uin

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8 Citations (Scopus)

Abstract

Two copolymers of poly(p-phenylenevinylene) (PPV) containing low levels (0.8 and 3.6 mole %) of the 2,3,5,6-tetramethyl1,4-phenylenevinylene (TMPV) units were prepared via the sulfbnium salt precursor route. The luminescence properties of the two copolymers were studied in detail mainly for photoluminescence (PL) and electroluminescence (EL) characteristics in comparison with those of PPV itself. Inclusion of low levels of TMPV units improves EL efficiency by more than 10 times when a single layer device was constructed using ITO coated glass anode and aluminum metal cathode. This was explained by the possible partial disruption of main chain -conjugation by the TMPV units which force its phenylene or vinylene structure to twist out of the coplanar structure in order to avoid of the steric repulsion between the methyl and vinyl protons in the TMPV units. The U V-vis, PL and EL spectra of the copolymers support this supposition.

Original languageEnglish
Pages (from-to)298-303
Number of pages6
JournalActa Polymerica
Volume50
Issue number8
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics

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