Enhanced Performance of Polymer Light Emitting Devices Using Zinc Oxide Nanoparticle with Poly(vinylcarbazole)

Abstract

The addition of zinc oxide (ZnO) nanoparticles into electroluminescent poly(vinylcarbazole) (PVK) polymer layers results in increased current densities, brightness, and luminance efficiencies in polymer light emitting devices. For low turn-on voltages, an increase in current density and good stability are achieved. At 9 V, we achieved a brightness of with a luminance efficiency of 0.35 cd/A for PVK–ZnO nanocomposite devices. Electroluminescence (EL) spectra reveal that the EL yield of PVK–ZnO nanoparticle devices increased greatly as compared with pure PVK devices. The current–voltage characteristics indicate that the addition of ZnO nanoparticles can facilitate better electrical injection and charge transport.