Patent ID: 7083865

Claim:
An OLED device comprising a light-emitting layer (LEL) containing a host and an emitting dopant located between a cathode and an anode wherein the dopant is an orange-red light emitting rubrene derivative represented by formula (I): wherein: a) there are identical aromatic groups at the 2- and 8-positions; b) the phenyl rings in the 5- and 11-positions contain only para-substituents identical to the aromatic groups in paragraph a); and c) the phenyl rings in the 6- and 12-positions are substituted or not in which formula (I) is represented by formula (II): wherein R 1 is an aromatic carbocyclic or heterocyclic group; R 2 is a substituent group; n is 0–5; provided that all R 1 are the same; and provided further, that the R 2 , their location and n value on one ring are the same as those on the second ring.