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Nicotinonitrile centered luminescent polymeric materials: Structural, optical, electrochemical, and theoretical investigations
Author(s) -
Pilicode Naveenchandra,
Naik Praveen,
Adhikari Airody Vasudeva
Publication year - 2020
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25493
Subject(s) - materials science , polymer , luminescence , photoluminescence , band gap , condensation polymer , monomer , electrochemistry , oled , light emitting diode , nanotechnology , chemical engineering , optoelectronics , chemistry , composite material , electrode , layer (electronics) , engineering
Herein, we describe the design, synthesis, and structural characterization of three new push‐pull type conjugative polymers, that is, VPPy 1‐3 comprising strong electron‐withdrawing N ‐heterocyclic nicotinonitrile scaffold coupled with electron‐donating phenylene units through vinylene bridges, as promising candidates for optoelectronic applications. They were successfully synthesized from their respective co‐monomers by simple polycondensation synthetic routes, viz. Knoevenagel and Wittig reactions. All the polymers were subjected to photophysical, electrochemical, thermal, and theoretical studies in order to ascertain their suitability in polymer light‐emitting diode applications as blue emitters. Evidently, they are readily soluble in most of the organic solvents, enabling them easy solution‐processable. These new polymers display strong blue photoluminescence at the peak in the range of 431 to 462 nm with a wide optical bandgap in the order of 2.55 to 2.63 eV. The obtained electrochemical data were employed to evaluate their HOMO/LUMOs. The density functional theory calculations generated useful information on their FMO, molecular geometries, and electronic properties. Also, the influence of their structural modification on the above‐said properties was discussed in detail to reveal the structure‐property relationship. Conclusively, these results illustrate the great prospective of this class of polymeric materials for the application in solution‐processable blue LEDs.