NOVEL FLUORESCENT POLYMER-ZINC OXIDE HYBRIDS FOR BRIGHT AND EFFICIENT WHITE LIGHT EMITTING DIODES

摘要

Fluorescent polymer-zinc oxide hybrid (PZOH) materials were successfully prepared using simple chemical bath deposition method at low temperature. The formation of ZnO nanoparticles and their deposition on the surface of fluorescent polymer was confirmed by SEM and TEM images, which were further clarified by performing selected area diffraction patterns in TEM image that confirms the incorporation of crystalline ZnO material. The optical emission efficiency showed significant enhancement by employing different ratio of ZnO composition with respect to fluorescent polymer. Finally, bright and efficient white light emitting diodes have been fabricated using these PZOH, as a luminescence converter (LUCO) with the help of commercially available Nitride based blue LED, as a primary pumping source. The output light efficiency of PZOHs fabricated White LED showed drastic improvement when compared to pure fluorescent polymer, due to higher PL quantum efficiency (86 %) of PZOH then the pure fluorescent polymer (54%).