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Synthesis and characterization of new 3-alkylthiophene copolymer that exhibit orange-red photoluminescence and electroluminescence

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Abstract

Using copolymerization functionalization, a Novel solution-processable π-conjugated 3-alkylthiophene copolymer (molar ratio of monomer 3-octylthiophene (3OT) and 3-(2-ethyl-1-hexyl) thiophene (3EHT) was 1:1) combining electrochemical properties of poly (3-octylthiophene) (P3OT) and poly (3-isooctylthiophene) (P3EHT) was synthesized by FeCl3-oxidative approach. Characterization of the polymers included FT-IR, NMR, gel permeation chromatography (GPC), thermo-gravimetric analysis (TGA), UV-Vis spectroscopy photoluminescence (PL) and electroluminescence (EL). P3OTEHT depicted excellent solubility in common organic solvents. The optical properties investigations showed that the band-gap energy of P3OTEHT was similar to P3OT (2.43 eV) at 2.45 eV and 6% lower than that of P3EHT in CHCl3 solution. The emission maxima of P3OTEHT was 50 nm blue-shifted with respect to that of P3OT. However, the PL intensity of P3OTEHT was seven times higher than that of P3OT in film. The turn-on voltage of LED (ITO/P3OTEHT/Ag) devices was approaching to P3OT (5.5 V) at 5.6 V and 1.9 V lower than that of P3EHT. The EL color of P3OTEHT was bright pure orange-red (emission λ ELmax of 600 nm), meanwhile, the half-wave bandwidth was 70 nm. TGA studies showed that P3OTEHT exhibited very good thermal stabilities, losing 5% of its weight on heating to 300 °C. The results indicate that the P3OTEHT with low band-gap energy, low turn-on voltage, high photoluminescence quantum yield pure EL color and processability, and might be promising polymer materials for applications in polymer light-emitting diodes, light-emitting electrochemical cells and polymer solar cells, etc.

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Acknowledgments

This work was supported by the Doctor Foundation of Ministry of Education of China (20030286012) and the Foundation High-tech Item of Province in Jiang-su of China(BG 2005034).

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Authors and Affiliations

  1. Applied Chemical Laboratory, College of Chemistry and Chemical Engineering, Southeast University, Nan Jing, 210096, P.R. China

    Zheng-jian Qi, Wei-dong Feng, Yue-ming Sun, Da-zhi Yan, Yan-fang He & Jing Yu

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  1. Zheng-jian Qi
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  2. Wei-dong Feng
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Correspondence to Zheng-jian Qi.

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Qi, Zj., Feng, Wd., Sun, Ym. et al. Synthesis and characterization of new 3-alkylthiophene copolymer that exhibit orange-red photoluminescence and electroluminescence. J Mater Sci: Mater Electron 18, 869–875 (2007). https://doi.org/10.1007/s10854-007-9149-0

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