An electroluminescent device comprised of an anode and a cathode, and situated therebetween said anode and said cathode at least one electron transport layer comprised of a triazine of the formula wherein A is a monovalent or a multi-valent aromatic group which contains at least two conjugate-linked or at least two fused aromatic rings; Ar1 and Ar2 are each independently aryl or aliphatic; and m represents the number of repeating segments.