Field emission property of printed CNTs-mixed ZnO nanoneedles

► Field emission (FE) properties of screen printed ZnO nanoneedles could be enhanced by carbon nanotubes mixture. ► The highest field emission property of CNT-mixed ZnO nanoneedles was expressed by heat-treated at 450 °C. ► The uniform distribution and great density of luminance point can be emitted from the screen printed CNT-mixed ZnO nanoneedles through heat treatment at 450 °C.