The conductive nanomaterials applicable to unconventional printing techniques have attracted the tremendous attention, and in particular, cost-effective copper-based electrode materials have been recognized a viable candidate to replace the expensive silver counterpart. In this study, we synthesize newly-designed Cu core/Cu 10 Sn 3 shell nanoparticles, as an additive material for overcoming the critical drawbacks in Cu nanoparticle-based electrodes, in combination with a large-area processable, continuous photonic sintering process in a time scale of 10 -3 sec. By virtue of a low melting-point nature of Cu 10 Sn 3 phase, the facile electrode fabrication process is easily triggered, evolving the resistivities of 27.8 and 12.2 µΩ·cm under energy dose conditions of 0.97 and 1.1 J/cm 2 , respectively, at which highly conductive electrodes are not obtainable from phase-pure Cu nanoparticles. The mixture suspension of Cu and Cu/Cu 10 Sn 3 nanoparticles enables for roll-to-roll processable, highly uniform Cu-based electrodes (with a sheet resistance and a standard deviation of 1.21 and 0.29 Ω/square, respectively) even on vulnerable polyethylene naphthalate (PEN) substrate, while the electrodes derived from Cu 10 Sn 3 phase-free Cu nanoparticles suffer from non-uniform characteristics and even a partially insulating nature.The practical applicability of Cu/Cu 10 Sn 3 core/shell nanoparticles is demonstrated with the fabrication of a touch screen panel and an antenna for wireless power transmission.