Patent ID: 7264889

Claim:
An OLED device comprising an anode and a cathode and, located therebetween, a light emitting layer (LEL) containing a host, an emissive dopant, and a stabilizer, wherein the stabilizer is a material different from the emissive dopant and contains at least 5 fused rings and is represented by Formula (1): wherein, each X a , X b , X c , X d is an independently selected substituent, two of which having the same superscript_may join to form a fused ring and k, l, m, and n are independently 0 to 4; each Y a , Y b , Y c , Y d is independently selected as either carbon or nitrogen atoms and X e , X f , X g , X h exist only in cases of carbon atoms; each X e , X f , X g , X h is hydrogen or an independently selected substituent; X i is a substituent and o is 0-2; and M is a metal atom of copper or cobalt; wherein the emissive dopant is one emitting blue or green light.