한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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Highly Efficient Light-Emitting PPV Derivatives Containing Polyhedral Oligomeric Silsesquioxanes (POSSs)

  • Kang, Jong-Min (Dept. of Applied Chemistry, Kumoh National Institute of Technology) ;
  • Cho, Hoon-Je (Dept. of Chemistry and School of Molecular Science (BK21), KAIST) ;
  • Eom, Jae-Hoon (Dept. of Applied Chemistry, Kumoh National Institute of Technology) ;
  • Lee, Jeong-Ik (Basic Research Lab. ETRI) ;
  • Lee, Sang-Kyu (Dept. of Chemistry and School of Molecular Science (BK21), KAIST) ;
  • Lee, Jong-Hee (Dept. of Chemistry and School of Molecular Science (BK21), KAIST) ;
  • Cho, Nam-Sung (Dept. of Chemistry and School of Molecular Science (BK21), KAIST) ;
  • Shim, Hong-Ku (Dept. of Chemistry and School of Molecular Science (BK21), KAIST) ;
  • Hwang, Do-Hoon (Dept. of Applied Chemistry, Kumoh National Institute of Technology)
  • Published : 2007.08.27
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Abstract

A new series of highly bright and efficient poly(pphenylenevinylene) s (PPV)s based on polyhedral oligomeric silsesquioxanes (POSSs) was synthesized via the Gilch polymerization method. The three POSScontaining PPVs are as follows: POSS05- PPV(containing 5 mol % POSS-appended PPV units), POSS25-PPV(containing 25 mol % POSS-appended PPV units), and POSS100-PPV(containing 100 mol % POSS-appended PPV units; this is the first ${\pi}-conjugated$ polymer composed of 100 mol % POSSsappended repeating units). The POSS-containing PPVs exhibit higher glass transition temperatures $(64-77^{\circ}C)$ than that of MEH-PPV $(58^{\circ}C)$, indicating that electroluminescence (EL) devices fabricated with these polymers should have good thermal stabilities. Light-emitting diodes (LEDs) with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al were fabricated using the novel POSS-containing PPVs. Surprisingly, the luminescence efficiency (0.48 cd/A at $10540\;cd/m^2$) of the binary blend consisting 5 wt % of POSS25-PPV and 95 wt % of MEH-PPV was found to be enhanced by a factor of 6.4 with a maximum brightness of $11010cd/m^2$ (at 14.3 V).

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