Compound represented by the general Formula (I): wherein X is selected from the group consisting of O, S and Se; R 1 and R 2 are independently selected from the group consisting of C 1 to C 12 alkyl, C 6 to C 20 aryl and C 5 to C 20 heteroaryl, wherein the respective C 1 to C 12 alkyl may optionally be substituted with C 6 -C 20 aryl; L represents a single bond or is selected from the group consisting of C 6 to C 18 arylene or C 2 to C 20 heteroarylene; wherein the rings B, C and D may each be unsubstituted or substituted and B and C are anellated aromatic rings; R 3 and R 4 are independently selected from the group consisting of unsubstituted or substituted C 6 to C 20 aryl; wherein the substituents, if present in B, C, D, R 3 and R 4 , are independently selected from the group consisting of C 1 - C 20 linear alkyl, C 3 - C 20 branched alkyl, C 3 - C 20 cyclic alkyl, C 1 - C 20 linear alkoxy, C 3 - C 20 branched alkoxy, linear fluorinated C 1 - C 12 alkyl, linear fluorinated C 1 - C 12 alkoxy, C 3 - C 12 branched fluorinated cyclic alkyl, C 3 - C 12 fluorinated cyclic alkyl, C 3 - C 12 fluorinated cyclic alkoxy, CN, C 6 -C 20 aryl, C 2 - C 20 heteroaryl, OR, SR, (C=O)R, (C=O)NR2, SiR 3 , (S=O)R, (S=O) 2 R, CR=CR 2 , Fluorine, NR 2 , NO 2 ; wherein R is independently selected from C 1 -C 20 linear alkyl, C 1 -C 20 alkoxy, C 1 -C 20 thioalkyl, C 3 -C 20 branched alkyl, C 3 -C 20 cyclic alkyl, C 3 -C 20 branched alkoxy, C 3 -C 20 cyclic alkoxy, C 3 -C 20 branched thioalkyl, C 3 -C 20 cyclic thioalkyl, C 6 -C 20 aryl and C 3 -C 20 heteroaryl; and R 3 and R 4 may or may not be connected with each other via a single bond. X is selected from the group consisting of O, S and Se; R 1 and R 2 are independently selected from the group consisting of C 1 to C 12 alkyl, C 6 to C 20 aryl and C 5 to C 20 heteroaryl, wherein the respective C 1 to C 12 alkyl may optionally be substituted with C 6 -C 20 aryl; L represents a single bond or is selected from the group consisting of C 6 to C 18 arylene or C 2 to C 20 heteroarylene; wherein the rings B, C and D may each be unsubstituted or substituted and B and C are anellated aromatic rings; R 3 and R 4 are independently selected from the group consisting of unsubstituted or substituted C 6 to C 20 aryl; wherein the substituents, if present in B, C, D, R 3 and R 4 , are independently selected from the group consisting of C 1 - C 20 linear alkyl, C 3 - C 20 branched alkyl, C 3 - C 20 cyclic alkyl, C 1 - C 20 linear alkoxy, C 3 - C 20 branched alkoxy, linear fluorinated C 1 - C 12 alkyl, linear fluorinated C 1 - C 12 alkoxy, C 3 - C 12 branched fluorinated cyclic alkyl, C 3 - C 12 fluorinated cyclic alkyl, C 3 - C 12 fluorinated cyclic alkoxy, CN, C 6 -C 20 aryl, C 2 - C 20 heteroaryl, OR, SR, (C=O)R, (C=O)NR2, SiR 3 , (S=O)R, (S=O) 2 R, CR=CR 2 , Fluorine, NR 2 , NO 2 ; wherein R is independently selected from C 1 -C 20 linear alkyl, C 1 -C 20 alkoxy, C 1 -C 20 thioalkyl, C 3 -C 20 branched alkyl, C 3 -C 20 cyclic alkyl, C 3 -C 20 branched alkoxy, C 3 -C 20 cyclic alkoxy, C 3 -C 20 branched thioalkyl, C 3 -C 20 cyclic thioalkyl, C 6 -C 20 aryl and C 3 -C 20 heteroaryl; and R 3 and R 4 may or may not be connected with each other via a single bond. <EOS>