Oled device containing a silyl-fluoranthene derivative

An OLED device comprising a cathode, an anode, and having therebetween a light-emitting layer and further comprising:

• a) a first layer, between the light-emitting layer and the cathode, wherein the first layer comprises a silyl-fluoranthene compound comprising a fluoranthene nucleus having a silicon atom bonded to the 8- or 9-position, and wherein the silicon atom is further bonded to three independently selected substituents;
• and
• b) a second layer, located between the first layer and the cathode and contiguous to the first layer, and wherein the second layer comprises an azine compound, wherein the azine compound is a polycyclic aromatic compound comprising an azine group and the absolute difference in LUMO energy values between the azine compound and the silyl-fluoranthene compound is 0.3 eV or less;
• and
• c) a third layer, located between the second layer and the cathode and contiguous to the second layer, wherein the third layer comprises an alkali metal, an inorganic alkali metal compound, or an organic alkali metal compound or mixtures thereof.