An electroluminescent device comprises a layer containing a naphthalene compound represented by Formula (1),
wherein:
each R
1
and R
2
represents an independently selected substituent provided that adjacent substituents may join to form a ring; p and w independently are 0-3; the amine nitrogens on the naphthalene nucleus are located on separate rings; m and n independently are 0, 1 or 2;
each Ar
b
represents an independently selected aromatic group; and each Ar
a
represents an independently selected phenylene, biphenylene or naphthalene group;
provided that at least one R
1
or R
2
substituent of the naphthalene compound represented by Formula (1) is a sterically bulky substituent.