FIG. 1 is a perspective view of the ultraviolet emitting device for nail hardening showing our new design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a top (plan) view thereof; and, FIG. 7 is a bottom view thereof.