Patent ID: 7863812

Claim:
An organic light emitting diode (OLED) comprising: an electron-transport layer; a hole-transport layer opposed to the electron-transport layer; and an emission layer disposed between the electron-transport layer and the hole-transport layer, the emission layer comprising: a host material, comprising 2-methyl-9,10-di(2-naphthyl) anthracene (MADN); a first luminescent dopant for emitting blue light, the first luminescent dopant comprising perylene; and a second luminescent dopant for emitting red or yellow light, the second luminescent dopant comprising 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyl-julolidyl-9-enyl)-4H-pyran) (DCJTB); wherein an absolute value of the highest occupied molecular orbital (HOMO) of the first luminescent dopant is less than or equal to that of the host material, and an absolute value of the lowest unoccupied molecular orbital (LUMO) of the first luminescent dopant is more than or equal to that of the host material.