Novel Electroluminescent Polymer Derived from Pyrene-Functionalized Polyaniline

Abstract

A solution processable polymer was synthesized, by incorporating pyrene groups into the backbone of the polyaniline chain, and used as an emissive layer in an organic light emitting diode. The polyaniline base was reacted with acid chloride of pyrene butyric acid to form pyrene-functionalized polyaniline chains. The source of pyrene moiety was acid chloride of pyrene butyric acid. The formation of polymer from acid chloride of pyrene butyric acid and polyaniline was confirmed by the FTIR and 1 H-NMR spectroscopy. Differential scanning calorimetry revealed high glass transition temperature of 210 o C. Due to the presence of pyrene moieties in the backbone, the polyaniline synthesized in the present study is solution processable with light emitting property. The photoluminescence spectrum of the polymer revealed that emission lies in the blue region, with a peak at 475 nm. The light emitting device of this polymer exhibits the turn-on voltage of 15 V.

Microstructure and properties of novel fluorescent pyrene functionalized PANI/P(VDF‐HFP) blend

“…The PL measurements for pf‐PANI upon excitation at 355 nm in m‐cresol solution (0.005 mg/mL) reveal an excimer fluorescent intensity maximum at ca. 479 nm in close agreement with its reported value [see Figure (B)] while PANI‐EB exhibits PL intensity maximum at ca. 398 nm.…”

“…The CN stretch of the aromatic amine appears at ca. 1295 cm −1 . In addition, pf‐PANI exhibits the aliphatic asymmetric and symmetric CH stretch vibrations at 2952 and 2856 cm −1 , respectively indicating the existence of alkyl substituents in PANI chain .…”

“…The EB form of PANI (PANI‐EB) was synthesized using a standard procedure and is the starting material for pyrene functionalized PANI (pf‐PANI) synthesis. The pf‐PANI has been synthesized by following the method as reported . In brevity, the synthesis was done by dissolving PANI base in m ‐cresol solvent and made to react with acid chloride of pyrene butyric acid at 120°C for 12 h to form pf‐PANI.…”

“…Because of this ability of hydrogen bonding interaction, compatible blends of PVDF have been made in the past with PMMA and acrylic resins . Recently, pyrene functionalized PANI has been reported that carries two 〉CO groups in its side chain (see Scheme ). Also, pyrene functionalization to PANI backbone results to material with good light emitting property and better solubility in organic solvents as compared with PANI .…”

“…Recently, pyrene functionalized PANI has been reported that carries two 〉CO groups in its side chain (see Scheme ). Also, pyrene functionalization to PANI backbone results to material with good light emitting property and better solubility in organic solvents as compared with PANI . Thus, it is anticipated that even P(VDF‐HFP) will be compatible with pf‐PANI.…”