Patent ID: 7208233

Claim:
An electroluminescent device comprising a host material and a rubrene derivative having a naphthacene nucleus comprising four fused phenyl rings a, b, c, and d, in order, wherein the rubrene derivative is represented by Formula (1), wherein: Ar 1 , Ar 2 , and Ar 3 represent independently selected aryl groups; each G represents an independently selected substituent; each m is independently 0–4; V 1 –V 5 represent hydrogen or independently selected substituent groups, provided there are in total two fluoro or perfluoroalkyl groups linked directly or indirectly to the “c” ring, selected from those where: a) at least one of V 1 –V 4 represents a fluoro or perfluoroalkyl group, or b) at least one of V 1 –V 5 and Ar 3 includes an aryl ring bearing a fluoro or trifluoroalkyl group.