TiO_2 reinforced PMMA-TiO_2 nanocomposite for its application in organic light emitting diode (OLED) as electron transport layer material

摘要

PMMA, TiO_2 and PMMA-TiO_2 nanocomposite were successfully synthesized in the laboratory via free radical polymerization process. The formation of PMMA corresponding change in the nanostructure with the embodiment of TiO_2 nanofillers was confirmed by X-ray diffraction technique (XRD) analysis. Irregular tetragonal bipyramidal arrangement of TiO_2 was formed within the spherical type structure of PMMA polymeric matrix, as examined by the surface morphological image. Relatively higher electron-hole non-radiative recombination of PMMA-TiO_2 nanocomposite corresponded to blue-violet band, blue band, and green band was examined from PL spectra. An enhanced current density ～165% was observed with significantly improved p-type conductivity for PMMA-TiO_2 nanocomposite. The improved specific capacitance with high dielectric constant and high electron-hole recombination rate confirmed that it can possibly use as electron transport layer material in the OLED devices fabrication.