| 摘要 |
Disclosed is an organic EL element which can have a prolonged service life. Specifically disclosed is an organic EL element which is characterized by comprising an anode, a cathode and a functional layer that is laminated between the anode and the cathode and comprises at least a hole-injection/transport layer, an organic light-emitting layer and an electron-transport layer, wherein the ratio of the thickness of the electron-transport layer to the total thickness of the anode and the hole-injection/transport layer [i.e., a (thickness of the electron-transport layer)/(total thickness of the anode and the hole-injection/transport layer) ratio] is 0.07 or more. The organic EL element is also characterized in that the ratio of the hole mobility of a hole-transporting material that constitutes the hole-injection/transport layer to the electron mobility of an electron-transporting material that constitutes the electron-transport layer [i.e., a (hole mobility of the hole-transporting material)/(electron mobility of the electron-transporting material) ratio] is 10 or more.
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