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 cm2/Vs or more in an electric field intensity of 0.4 to 0.5 MV/cm, the electron mobility/hole mobility (ΔEM) of a host material constituting the emitting layer, and the electron mobility/hole mobility (ΔET) of the electron-transporting material with the slowest electron mobility constituting the electron-transporting layer satisfying the following relationship: ΔET > 1, 0.3 ≤ ΔEM ≤ 10, and ΔET > ΔEM.
一种有机电致发光器件,包括:阴极;阳极;以及至少包括发光层和位于阴极与阳极之间的电子传输层的有机层,构成电子传输层的电子迁移率最慢的电子传输材料在电场强度为0.4至0.5 MV/cm,构成发射层的主材料的电子迁移率/空穴迁移率(Δ
EM)和构成电子传输层的电子迁移率最慢的电子传输材料的电子迁移率/空穴迁移率(ΔET)满足以下关系:ΔET>1,0.3≤Δ
EM≤10,且ΔET>Δ
EM。