| 摘要 |
An organic electroluminescent device, including: a cathode; an anode; and organic layers including at least an emitting layer and an electron-transporting layer between the cathode and the anode, the electron-transporting material with the slowest electron mobility constituting the electron-transporting layer having an electron mobility of 2.0×10 -5 cm 2 /Vs or more in an electric field intensity of 0.4 to 0.5 MV/cm, the electron mobility/hole mobility (”EM) of a host material constituting the emitting layer, and the electron mobility/hole mobility (”ET) of the electron-transporting material with the slowest electron mobility constituting the electron-transporting layer satisfying the following relationship: ”ET > 1, 0.3 ‰¤ ”EM ‰¤ 10, and ”ET > ”EM.
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