Organic electroluminescent device

An organic light-emitting device (OLED) comprises an anode, a cathode, and one or more organic layers, wherein the said one or more organic layers contains at least one compound having the formula I:

• wherein,
• R1-R8 independently represent hydrogen, halogen, cyano, nitro, C1-C8 alkyl, C1-C8 alkoxy, C2-C8 substituted or unsubstituted alkenyl, C2-C8 substituted or unsubstituted alkynyl, C1-C4 alkyl substituted or unsubstituted phenyl, or C1-C4 alkyl substituted or unsubstituted naphthyl;
• and,
• Ar1-Ar4 independently represent C1-C4 alkyl or C6-C30 aryl substituted phenyl, C1-C4 alkyl or C6-C30 aryl substituted naphthyl, phenyl, naphthyl, C6-C30 N-aryl or C1-C4 alkyl-substituted carbazolyl, dibenzothiophenyl, dibenzofuranyl, anthryl, phenanthryl, pyrenyl, perylenyl, fluoranthenyl, (9,9-di-alkyl) fluorenyl, (9,9-dialkyl-substituted or unsubstituted aryl) fluorenyl, or 9,9-spiro-fluorenyl.