| abstract |
A nitrogen-containing heteroaromatic compound is represented by the following formula (A). n nwherein Y is an oxygen atom or a sulfur atom, M is a substituted or unsubstituted nitrogen-containing heteroaromatic group, and Ar 2 is a substituted aromatic hydrocarbon group having 6 to 18 ring carbon atoms, a substituted or unsubstituted monocyclic heteroaromatic group having 5 or 6 ring atoms, a dibenzofuran ring group that may be substituted with a substituent (excluding a 3-carbazolyl group and an N-carbazolyl group), a dibenzothiophene ring group that may be substituted with a substituent (excluding a 3-carbazolyl group and an N-carbazolyl group), or a nitrogen-containing polycyclic group among nitrogen-containing polycyclic groups respectively represented by the following formulas (1) to (5). |