A compound represented by Formula : wherein 1) Ar 1 and Ar 2 are each independently of a C 6 -C 60 aryl group; or C 2 -C 60 heteroaryl group; 2) L 1 and L 2 are each independently selected from the group consisting of a single bond; C 6 -C 60 arylene group; and C 2 -C 60 heteroarylene group; 3) R 1 , R 2 and R 3 are the same or different from each other, and independently of each other are hydrogen or deuterium; 4) a is an integer of 0 to 6, b is an integer of 0 to 2, c is an integer of 0 to 4; provided that at least one of Ar 1 , Ar 2 , L 1 , L 2 , R 1 , R 2 and R 3 is necessarily substituted with deuterium; wherein the aryl group, arylene group, heteroaryl group, and heteroarylene group may be substituted with one or more substituents selected from the group consisting of deuterium; halogen; boron group; germanium group; cyano group; nitro group; C 1 -C 20 alkylthio group; C 1 -C 20 alkoxy group; C 1 -C 20 alkyl group; C 2 -C 20 alkenyl group; C 2 -C 20 alkynyl group; C 6 -C 20 aryl group; C 6 -C 20 aryl group substituted with deuterium; a fluorenyl group; C 2 -C 20 heterocyclic group; C 3 -C 20 cycloalkyl group; C 7 -C 20 arylalkyl group; and C 8 -C 20 arylalkenyl group; and the substituents may be bonded to each other to form a saturated or unsaturated ring, wherein the term 'ring' means a C 3 -C 60 aliphatic ring or a C 6 -C 60 aromatic ring or a C 2 -C 60 heterocyclic group or a fused ring formed by the combination thereof; provided that compounds represented by the following Formula in Formula are excluded: wherein Ar 1 and L 1 are the same as defined in Formula , R 4 and R 5 are each independently hydrogen or deuterium, d is an integer from 0 to 7, and e is an integer from 0 to 4. 1) Ar 1 and Ar 2 are each independently of a C 6 -C 60 aryl group; or C 2 -C 60 heteroaryl group; 2) L 1 and L 2 are each independently selected from the group consisting of a single bond; C 6 -C 60 arylene group; and C 2 -C 60 heteroarylene group; 3) R 1 , R 2 and R 3 are the same or different from each other, and independently of each other are hydrogen or deuterium; 4) a is an integer of 0 to 6, b is an integer of 0 to 2, c is an integer of 0 to 4; provided that at least one of Ar 1 , Ar 2 , L 1 , L 2 , R 1 , R 2 and R 3 is necessarily substituted with deuterium; wherein the aryl group, arylene group, heteroaryl group, and heteroarylene group may be substituted with one or more substituents selected from the group consisting of deuterium; halogen; boron group; germanium group; cyano group; nitro group; C 1 -C 20 alkylthio group; C 1 -C 20 alkoxy group; C 1 -C 20 alkyl group; C 2 -C 20 alkenyl group; C 2 -C 20 alkynyl group; C 6 -C 20 aryl group; C 6 -C 20 aryl group substituted with deuterium; a fluorenyl group; C 2 -C 20 heterocyclic group; C 3 -C 20 cycloalkyl group; C 7 -C 20 arylalkyl group; and C 8 -C 20 arylalkenyl group; and the substituents may be bonded to each other to form a saturated or unsaturated ring, wherein the term 'ring' means a C 3 -C 60 aliphatic ring or a C 6 -C 60 aromatic ring or a C 2 -C 60 heterocyclic group or a fused ring formed by the combination thereof; provided that compounds represented by the following Formula in Formula are excluded: wherein Ar 1 and L 1 are the same as defined in Formula , R 4 and R 5 are each independently hydrogen or deuterium, d is an integer from 0 to 7, and e is an integer from 0 to 4. <EOS>