Patent ID: 8859717

Claim:
A nitrogen-containing fused ring compound having at least one structural unit selected from the group consisting of a structural unit represented by the formula (1-1) and a structural unit represented by the formula (1-2): wherein Ar 1 represents an aromatic ring having 4 or more carbon atoms which may have a substituent, either one of Y 1 and Y 2 represents a group represented by —C(═X 1 )— and the other represents a single bond, either one of Y 3 and Y 4 represents a group represented by —C(═X 2 )— and the other represents a single bond, X 1 and X 2 each independently represent an oxygen atom, a sulfur atom or a group represented by ═C(A 1 ) 2 (wherein A 1 represents a hydrogen atom, a halogen atom or a monovalent group, and two A 1 s may be identical to or different from each other), and Z 1 and Z 2 each independently represent an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, a group represented by the formula (a-1), a group represented by the formula (a-2), a group represented by the formula (a-3), a group represented by the formula (a-4) or a group represented by the formula (a-5): wherein R 3 , R 4 , R 5 and R 6 each independently represent a hydrogen atom, a halogen atom or a monovalent group, and R 3 and R 4 may be bonded to each other to form a ring.