Journal of Fluorescence

, Volume 26, Issue 4, pp 1457–1466 | Cite as

Synthesis and Optoelectronic Properties of Thiophene Donor and Thiazole Acceptor Based Blue Fluorescent Conjugated Oligomers

  • K. Mahesh
  • S. Karpagam


We report on the synthesis and characterization of low band gap, blue light emitting and thermal stable conjugated oligomer by Wittig condensation. Thiophene and thiazole type of donor-acceptor based series of conjugated oligomers, Oligo-4,5-bis-[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OBTV-TZ) and Oligo-2,4,5-Tris–[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OTTV-TZ) were synthesized. These oligomers were confirmed by FT-IR and 1H-NMR and LC/MS analysis. The effect of the number of thiophene rings on the optical, electrochemical, thermal and morphological properties of the oligomers were systematically investigated. Both oligomers were exhibited almost same absorption wavelength in methanol solution (λmax = 365 nm and 369 nm) which indicates both oligomers illustrate similar intra molecular charge transfer (ICT). In solid state, the oligomers were exhibited broadening peaks with higher onset absorptions (λmax = 600 nm and 580 nm). The photoluminescence absorption spectrum of the oligomers was observed at 433 nm and 434 nm respectively in methanol solution with blue emission. The electrochemical band gap (\( {E}_g^{ec} \)) of the OBTV-TZ was 1.55 eV (low band gap) and OTTV-TZ was exhibited greater highest occupied molecular orbital (HOMO) value (E HOMO = −6.6 eV). Moreover morphological parameters of both oligomer film of 2D and 3D diagrams were observed by using AFM studies.


Blue light emitting Conjugated oligomers Thiophene Thiazole Internal charge transfer Low band gap 



This work was financially supported by DST-SERB, New Delhi (Grant no. SB/FT/CS-140/2013). The authors are grateful to DST/VIT-FIST, VIT University for providing instrumental facilities.


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Organic Chemistry Division, School of Advanced SciencesVIT UniversityTamil NaduIndia

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