Patent ID: 7951965

Claim:
A phenanthrene compound having the following formula (I): wherein Ar 1 and Ar 2 independently are a phenyl group comprising a conjugated substituent, and the conjugated substituent is and wherein Y and Z independently are selected from the group consisting of H, Cl, F, CF 3 , CN, NO 2 , t-butyl, C1-C20 alkyl, C1 C 20 alkoxy, phenyl, biphenyl, 1-nathphnyl, 2-nathphyl, 2-thienyl, 2-furyl, —O-phenyl, —O biphenyl, —O-2-naphthyl, —O-2 thienyl and —O-2-furyl; and W is C1-C4 alkylene or —SO 2 —.