| 摘要 |
An organic light emitting device has a light emitting layer and an electron injecting and transporting layer which are sandwiched between a pair of electrodes formed of an anode and a cathode. The electron injection dopant material is doped into an electron transporting material in such a manner that concentration of the dopant becomes low, high, and low in the regions of the electron injecting and transporting layer in the stated order from the light emitting layer side in the film thickness direction. Further, in the region brought into contact with the cathode of the electron injecting and transporting layer, the concentration of the dopant is preferably set high. The organic light emitting device improves drive durability and high light extraction efficiency.
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