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1. A compound having the formula: wherein Z1, Z2, Z3, Z4 and Z5 are each independently selected from group consisting of CR9 and N; wherein any adjacent R9 are optionally joined to form a fused ring; wherein at least one of Z1, Z2, Z3, Z4 and Z5 is N; wherein L1 is selected from the group consisting of: and combinations thereof; wherein X1 is O, S, or CRR′; wherein R, R′ are optionally joined to form a ring; wherein n1 is an integer from 1 to 20; wherein L1 can be further substituted by a substituent selected from the group consisting of alkyl, aryl, and heteroaryl; wherein at least one of R1, R2, R3, R4, R5, R6, R7, and R8 comprises at least one electron donor group selected from the group consisting of: wherein X and Y is selected from the group consisting of O, S, NR14; and wherein R11, R12, R13 and R14 are selected from the group consisting of aryl and heteroaryl. wherein any two adjacent R1, R2, R3, R4, R5, R6, R7, and R8 are not joined to form a ring; wherein m is an integer from 1 to 20; wherein n2 is an integer from 1 to 20; wherein R1, R2, R3, R4, R5, R6, R7, and R8 do not contain an electron acceptor group; wherein R9 does not contain an electron donor group; wherein R1, R2, R3, R4, R5, R6, R7, and R8 are independently selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, and combinations thereof and wherein R9, R, and R′ are independently selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, heteroalkyl, arylalkyl, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, and combinations thereof.
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