Patent ID: 8129039

Claim:
An OLED device comprising a cathode, an anode, and having there between a red light emitting layer containing a non-light-emitting fluoranthene host compound with a 7,10-diaryl substituted fluoranthene nucleus having no aromatic rings annulated to the fluoranthene nucleus, and a red light-emitting phosphorescent dopant; wherein the fluoranthene compound is according to Formula (II): wherein: R 1 , R 2 , R 3 and R 4 are independently hydrogen or an aromatic group containing 6 to 24 carbon atoms with the proviso that any adjacent R 1 -R 4 is not part of an aromatic ring system annulated to the fluoranthene nucleus; R is hydrogen or a substituent; and n and m are independently 1-5; and wherein the phosphorescent dopant is an organometallic complex containing iridium or platinum.