한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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EL Properties of PFV and PPV Copolymers

  • Hwang, Do-Hoon (Dept. of Applied Chemistry, Kumoh National Institute of Technology) ;
  • Lee, Jong-Don (Dept. of Applied Chemistry, Kumoh National Institute of Technology) ;
  • Kang, Jong-Min (Dept. of Applied Chemistry, Kumoh National Institute of Technology) ;
  • Lee, Chang-Hee (Dept. of Physics, Inha University) ;
  • Jin, Sung-Ho (Dept. of Chemistry Education, Pusan National University)
  • Published : 2003.07.09
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Abstract

A new class of light-emitting poly(p-phenylenevinylene) (PPV) derivatives. poly(9,9-di-n-octyfluorenyl- 2,7-vinylene) (PFV) and its PPV copolymers, poly[(9,9-di-n-octylfluorenyl-2,7-vinylene)-co-(1,4-phenylenevinylene)]s [Poly(FV-co-PV)s] was synthesized through Gilch polymerization, and their light-emitting properties were investigated. The copolymers showed almost the same UV absorption and PL emission as the PFV homopolymer, regardless of copolymer composition. Interestingly, the EL spectra of these devices were similar to the PL spectra of the corresponding polymer film. However, the EL devices constructed from the poly(FV-co-PV)s showed 10 times higher efficiency than the devices constructed from the PFV homopolymer. This higher efficiency is possibly a result of better charge carrier balance in the copolymer systems due to the lower HOMO level (${\sim}5.5$ eV) of the poly(FV-co-PV)s in comparison to the PFV (${\sim}5.7$ eV).

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