Patent ID: 8057920

Claim:
A heterocyclic compound represented by Formula I: wherein Ar 1 is a bivalent linking group and is a C6-C16 substituted or unsubstituted arylene or heteroarylene group; Ar 2 and Ar 3 are each independently selected from the group consisting of a C6-C20 substituted or unsubstituted aryl group, a C4-C20 substituted or unsubstituted heteroaryl group and a C6-C20 substituted or unsubstituted fused polycyclic group; Ar 4 is selected from the group consisting of a C6-C20 substituted or unsubstituted aryl group, a C6-C20 substituted or unsubstituted aryloxy group, a C4-C20 substituted or unsubstituted heteroaryl group and a C6-C20 substituted or unsubstituted fused polycyclic group; and optionally, Ar 1 and Ar 3 or Ar 2 and Ar 3 are connected to each other to form a ring.