Abstract

The effect of ZnO nanoparticles as an electron transport layer (ETL) on the electronic properties of organic light-emitting diodes (OLEDs) was experimentally investigated in this study. OLED was fabricated with the structure of ITO/PEDOT:PSS/PVK/Eu/ZnO nanoparticle/PBD/Al, and then loaded with different amounts on ZnO nanoparticles. The scanning electron microscope field effect, optical absorption, luminescence, and current density–voltage of the OLEDs were characterized. Results showed that using ZnO nanoparticles as an ETL enhanced the performance and efficiency of the OLEDs. Moreover, increasing the loading amount of the ZnO nanoparticles increased luminescence and transparency and decreased work voltage. The characterization results showed that adding layers of ZnO nanoparticles changed the work voltage from 12.2 to 10 V, maximum luminescence from 0.19 to 0.23, and transparency from 60 to 86%.