Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Synthesis and Characterization of Organic Light-Emitting Copolymers Containing Naphthalene

  • Kim, Jung-Sik (School of Materials Science and Engineering and ERI, Gyeongsang National University) ;
  • Heo, Jun (School of Materials Science and Engineering and ERI, Gyeongsang National University) ;
  • Kang, Peng-Tao (School of Materials Science and Engineering and ERI, Gyeongsang National University) ;
  • Kim, Jin-Hak (School of Materials Science and Engineering and ERI, Gyeongsang National University) ;
  • Jung, Sung-Ouk (School of Materials Science and Engineering and ERI, Gyeongsang National University) ;
  • Kwon, Soon-Ki (School of Materials Science and Engineering and ERI, Gyeongsang National University) ;
  • Kim, Un-Kyung (Department of Chemistry and RINS, Gyeongsang National University) ;
  • Kim, Yun-Hi (Department of Chemistry and RINS, Gyeongsang National University)
  • Published : 2009.02.25
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Abstract

Conjugated PPV-derived block copolymers containing 2-ethylhexyloxynaphthalene unit were synthesized and characterized in this study. The resulting polymers were soluble in common organic solvents and showed good thermal stabilities, The weight-average molecular weights ($M_w$) of the copolymers ranged from 246,000 to 475,000 with PDIs of $1.3{\sim}2.1$. The optical properties of these polymers, measured both in a chloroform solution and on a film, showed a maximum absorption at $405{\sim}476\;nm$ for Copolymers $I{\sim}VIII$. In the PL spectra, Copolymers $I{\sim}VIII$ showed maximum peaks at $510{\sim}566\;nm$. The HOMOs, LUMOs and band gaps of the PPV derivatives of Copolymers $I{\sim}VIII$ were $5.30{\sim}5.77$, $3.04{\sim}3.24$, and $2.5{\sim}2.2\;eV$, respectively, The multi-layered, light-emitting diodes of ITO/PEDOT/copolymers/LiF/Al exhibited turn-on voltages of $6{\sim}2.5\;V$ Copolymer VIII exhibited the maximum brightness of $3.657\;cd/m^2$. Particularly, Copolymer VII, with an identical composition of MEH-PPV and naphthalene-PPV, showed a maximum luminance efficiency and power efficiency of 2,63 cd/A and 1.06 lm/W, respectively.

Keywords

References

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