Patent ID: 8293385

Claim:
An organic light-emitting device comprising: an anode; a cathode; and an emissive layer disposed between the anode and the cathode, wherein the emissive layer comprises a phosphorescent dopant and a phthalimide compound as a host having the formula: wherein R 1 represents one or more independently selected substitutions located on any position of the ring, wherein each substitution is a hydrogen, an alkyl moiety containing up to fifteen carbon atoms, or an aryl moiety, and wherein R is represented by one of the following formula: wherein R 2 , R 3 , R 4 , R 7 , and R 9 each represents one or more independently selected substitutions located on any position of the ring, wherein each substitution is hydrogen, an alkyl moiety containing up to fifteen carbon atoms, or an aryl moiety, wherein R 5 and R 8 each represents a substitution located on any position of the ring, wherein R 5 and R 8 is represented by the formula: