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

A compound of Formula 1:

• wherein:
• X is O or S,
• R1 to R4 are each independently selected from the group consisting of hydrogen, deuterium, halogen, a cyano group, a C6-C60 aryl group, a fluorenyl group, a C2-C60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C1-C50 alkyl group, with the proviso that:
• at least one of R1 and R2 is in plural and adjacent R1 groups and/or adjacent R2 groups form a C6-C14 aromatic hydrocarbon ring together,
• a and d are each an integer of 0 to 4, b and c are each an integer of 0 to 3, a+b+c+d is an integer of 1 or more, and where they are each an integer of 2 or more, each of a plurality of R1s, each of a plurality of R2s, each of a plurality of R3s, each of a plurality of R4s is the same or different from each other,
• Ar1 is a C6-C12 aryl group,
• Ar2 is selected from the group consisting of a C6-C60 aryl group, a fluorenyl group, a C2-C60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C3-C60 aliphatic ring group and a C1-C50 alkyl group,
• L is selected from Formula a1 to Formula a12, Formulas a25 to a35, and Formula a37:
• wherein Ar4 and Ar5 are selected from the group consisting of hydrogen, a C6-C60 aryl group, a fluorenyl group, a C2-C60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C3-C60 aliphatic ring group, a C1-C50 alkyl group and a combination thereof.