In recent years, colloidal quantum-dots based light-emitting diodes (QD-LEDs) have been considered as the attractive display device because of remarkable electrical/optical characteristics of colloidal quantum dots. QD-LEDs are of particular interest due to their wide-range color tunability, high brightness and good color purity by narrow emission bandwidth. Challenges remain, however, in achieving the necessary multilayer device structures using printing process. In this study, quantum dots were printed by electrohydrodynamic (EHD)-Jet spray technology and were applied to all solution-processed QD-LEDs. The QD-LED has a structure of ITO/PEDOT:PSS/PVK/ EHD-sprayed QDs/ZnO/Al. Core/shell type red QD of CdS/ZnS/CdSe and ZnO NPs as the carrier transporting layer were synthesized using solution mediated process according to the literatures. Sprayed QD pattern was controlled with the various parameters to obtain uniform surface morphology. The optimized QD-LED device showed a luminance of 1,980 cd/m2, current efficiency of 1.07 cd/A, and EQE of 1.01 %.