Synthesis and Characterization of PPY-PANI-ZnO Hybrid Nanocomposites for OLEDs Applications as Electron Transport Layer

PPY, PANI and PPY-PANI-ZnO ternary nanocomposites were synthesized in the laboratory via chemical oxidative polymerization method. The formation of PPY, PANI and corresponding change in the nanostructure with the incorporation of ZnO was examined by X-ray diffraction technique (XRD). Nano-flakes like structure were formed in the PPY-PANI polymeric matrix with the embodiment of ZnO nanoparticles, as examined by surface topology images. Optical transmittance spectra showed the optimized reduced band gap ~2.67eV. Increased rate of electron-hole nonradiative recombination associated to blue and green bands was confirmed from PL spectra. An enhanced current density ~197.75% was examined due to the significantly improved conductivity of PPY-PANI-ZnO ternary nanocomposites. This improved conductivity, reduced band gap and high electron-hole recombination rate confirmed that it can be used as electron transport layer in the OLED devices.