Hybrid organic-inorganic light emitting diodes: Effect of Ag-doped ZnO

We have fabricated, characterized and compared efficiencies of hybrid light emitting diodes (HyLEDs) using Ag-doped ZnO and ZnO nanomaterials as electron injection layers [Ell] and imidazole (NSPI) as organic emitting later [ITO/ZnO or Ag-doped ZnO/NSPI/MoO3/Al]. A reduced optical band gap of the Ag-doped ZnO compared to pristine ZnO was observed which leads to decrease the valence band offset at Agdoped ZnO: NSPI interface compared to ZnO: NSPI interface. The device with nano Ag-doped ZnO layer facilitates the electron injection more efficiently than the one with nano ZnO layer. The current density and luminance of the devices increased significantly by Ag-doped ZnO device at low driving voltage compared to the control device. The device with 2.0% Ag-doped ZnO nanomaterials show maximum luminance of 10982 cd/m(2) and maximum current efficiency of 41.0 cd/A and power efficiency of 8.9 lmw(-1) corresponds to the external quantum efficiency of 15.2% was obtained with 3.0% Ag-doped ZnO. (C) 2016 Elsevier B.V. All rights reserved.