Patent ID: 8912531

Claim:
An organic electroluminescent device comprising an emitting layer, an electron-injecting controlling layer and an electron-transporting layer between an anode and a cathode in sequential order from the anode, bonding one to another, the emitting layer comprising a host material and a dopant, the ionization potential (Ips) of a main material forming the electron-injecting controlling layer and the ionization potential (Iph) of the host material of the emitting layer satisfying the following relationship (i), an electron mobility of an electron-transporting material forming the electron-transporting layer being 10 −5 cm 2 /Vs or more at the electric field intensity of 16,000 to 25,000 (V/cm), and an affinity (Af1) of the host material of the emitting layer, an affinity (Af2) of the main material forming the electron-injecting controlling layer, and an affinity (Af3) of the electron-transporting material forming the electron-transporting layer satisfying the following relationships (ii) and (iii) 0.5 eV>Ip s −Ip h> 0 eV (i) Af2−Af1>0 eV (ii) Af3−Af2>0.2 eV (iii).