Improved Stability and Spectral Photophysical Properties of poly (9, 9′-di-n-1 octylfluorenyl-2.7-diyl) /MgO Nanohybrid Films

Abstract

Nanohybrid thin films were prepared using a low-cost and scalable spin coating technique from Poly (9,9′-di-n-octylfluorenyl-2.7-diyl) (PFO) and different ratios of Magnesium oxide nanocrystals (MgO·NCs) prepared by the coprecipitation method. The effect of the nanoparticle ratios on the morphology and structure of PFO/MgO nanohybrid thin films was studied using Field Emission Scanning Electron Microscope (FE-SEM) and X-ray diffraction (XRD). The optimal ratio of MgO·NCs for enhancing the fluorescence intensity and electronic band transitions of beta conformation of PFO chain was 1.5 wt%, as indicated by the optical absorption and fluorescence spectroscopy. Better color quality was obtained and quantified by CIE1976 chromaticity coordinates, which exhibited a wide range of appealing blue hues. The ideal PFO/MgO nanohybrid film got improved current–voltage characteristics for a Schottky device by 65% compared to pristine PFO. The film stability was tested for thermal aging at a high atmospheric temperature 50 ℃, and the results showed remarkable stability, which is important for blue OLED applications in hot climatic countries like KSA.