Compound for organic electronic element, organic electronic element using the same, and an electronic device thereof

A compound represented by Formula 1:

• wherein:
• R1, R2, R3 and R4 are each the same or different, and each independently hydrogen, deuterium, or a C1-C20 alkyl group, and adjacent plurality groups thereof are not bonded to each other to form a ring,
• X is O or S,
• L1 and L2 are each independently a single bond;
• or a phenylene group;
• Ar1 and Ar2 are each independently a phenyl group;
• or a naphthyl group;
• a and d are each independently an integer of 0 to 4, b is an integer of 0 to 3, c is an integer of 0 to 6,
• wherein the alkyl group, phenyl group, phenylene group, or naphthyl group may be further substituted with one or more deuterium.