An organic compound H of Formula: wherein: each of X' 1 and X' 2 is independently from another selected from the group consisting of N and CR Tz; R Tz is at each occurrence independently from another selected from the group consisting of hydrogen, deuterium, CN, CF 3, C 1 -C 20 -alkyl, C 6 -C 18 -aryl, and C 7 -C 19 -alkaryl and, wherein C 6 -C 18 -aryl or C 7 -C 19 -alkaryl can at each occurrence be optionally substituted by a residue selected from the group consisting of C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, and C 6 -C 18 -aryl; R' 1, R' 2, R' 3, R' 4, R' 5, R' 6, R' 7, R' 8, R' 9, and R' 10 is independently from another selected from the group consisting of hydrogen, deuterium, CN, CF 3, C 1 -C 20 -alkyl, C 6 -C 18 -aryl, C 7 -C 19 -alkaryl, and ―SiR F R G R H, wherein C 6 -C 18 -aryl or C 7 -C 19 -alkaryl can at each occurrence be optionally substituted by a residue selected from the group consisting of C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, and C 6 -C 18 -aryl; wherein at least one of R' 1, R' 2, R' 3, R' 4, R' 5, R' 6, R' 7, R' 8, R' 9, and R' 10 is CN; each of R F, R G and R H is selected from the group consisting of unsubstituted or substituted C 6 -C 18 -aryl, C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, C 1 -C 20 -heteroalkyl and C 3 -C 17 -heteroaryl; R A, R B, R C, R D, and R E, is independently from another selected from the group consisting of hydrogen, deuterium, CN, CF 3, C 1 -C 20 -alkyl, C 6 -C 18 -aryl, C 7 -C 19 -alkaryl, and ―SiR K R M R N, wherein C 6 -C 18 -aryl or C 7 -C 19 -alkaryl can at each occurrence be optionally substituted by a residue selected from the group consisting of C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, and C 6 -C 18 -aryl; each of R K, R M, and R N is selected from the group consisting of unsubstituted or substituted C 6 -C 18 -aryl, C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, C 1 -C 20 -heteroalkyl and C 3 -C 17 -heteroaryl; wherein at least one of R A, R B, R C, R D and R E is -SiR K R M R N and wherein the term "alkaryl" used in the definition of the scope represents a residue that comprises a bivalent alkylene residue to which an aryl residue is bound, i.e. an alkylene-aryl residue. each of X' 1 and X' 2 is independently from another selected from the group consisting of N and CR Tz; R Tz is at each occurrence independently from another selected from the group consisting of hydrogen, deuterium, CN, CF 3, C 1 -C 20 -alkyl, C 6 -C 18 -aryl, and C 7 -C 19 -alkaryl and, wherein C 6 -C 18 -aryl or C 7 -C 19 -alkaryl can at each occurrence be optionally substituted by a residue selected from the group consisting of C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, and C 6 -C 18 -aryl; R' 1, R' 2, R' 3, R' 4, R' 5, R' 6, R' 7, R' 8, R' 9, and R' 10 is independently from another selected from the group consisting of hydrogen, deuterium, CN, CF 3, C 1 -C 20 -alkyl, C 6 -C 18 -aryl, C 7 -C 19 -alkaryl, and ―SiR F R G R H, wherein C 6 -C 18 -aryl or C 7 -C 19 -alkaryl can at each occurrence be optionally substituted by a residue selected from the group consisting of C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, and C 6 -C 18 -aryl; wherein at least one of R' 1, R' 2, R' 3, R' 4, R' 5, R' 6, R' 7, R' 8, R' 9, and R' 10 is CN; each of R F, R G and R H is selected from the group consisting of unsubstituted or substituted C 6 -C 18 -aryl, C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, C 1 -C 20 -heteroalkyl and C 3 -C 17 -heteroaryl; R A, R B, R C, R D, and R E, is independently from another selected from the group consisting of hydrogen, deuterium, CN, CF 3, C 1 -C 20 -alkyl, C 6 -C 18 -aryl, C 7 -C 19 -alkaryl, and ―SiR K R M R N, wherein C 6 -C 18 -aryl or C 7 -C 19 -alkaryl can at each occurrence be optionally substituted by a residue selected from the group consisting of C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, and C 6 -C 18 -aryl; each of R K, R M, and R N is selected from the group consisting of unsubstituted or substituted C 6 -C 18 -aryl, C 1 -C 20 -alkyl, C 7 -C 19 -alkaryl, C 1 -C 20 -heteroalkyl and C 3 -C 17 -heteroaryl; wherein at least one of R A, R B, R C, R D and R E is -SiR K R M R N and wherein the term "alkaryl" used in the definition of the scope represents a residue that comprises a bivalent alkylene residue to which an aryl residue is bound, i.e. an alkylene-aryl residue.