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Synthesis and characterization of organic light-emitting copolymers containing naphthalene

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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∼2.1. The optical properties of these polymers, measured both in a chloroform solution and on a film, showed a maximum absorption at 405∼476 nm for Copolymers I∼VIII. In the PL spectra, Copolymers I∼VIII showed maximum peaks at 510∼566 nm. The HOMOs, LUMOs and band gaps of the PPV derivatives of Copolymers I∼VIII were 5.30∼5.77, 3.04∼3.24, and 2.5∼2.2 eV, respectively. The multi-layered, light-emitting diodes of ITO/PEDOT/copolymers/LiF/Al exhibited turn-on voltages of 6∼2.5 V. Copolymer VIII exhibited the maximum brightness of 3,657 cd/m2. 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.

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  1. Jung-Sik Kim

    Present address: Dongjin Semichem Inc., Ltd., 445-930, Hwasung, Korea

Authors and Affiliations

  1. School of Materials Science and Engineering and ERI, Gyeongsang National University, 660-701, Jinju, Korea

    Jung-Sik Kim, Jun Heo, Pengtao Kang, Jin Hak Kim, Sung Ouk Jung & Soon-Ki Kwon

  2. Department of Chemistry and RINS, Gyeongsang National University, 660-701, Jinju, Korea

    Un-Kyung Kim & Yun-Hi Kim

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  1. Jung-Sik Kim
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Correspondence to Soon-Ki Kwon or Yun-Hi Kim.

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Kim, JS., Heo, J., Kang, P. et al. Synthesis and characterization of organic light-emitting copolymers containing naphthalene. Macromol. Res. 17, 91–98 (2009). https://doi.org/10.1007/BF03218660

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