| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic EL device which utilizes phosphorescent emission having a high luminous efficiency and has a prolonged lifetime under a driving condition at high temperatures. SOLUTION: The organic EL device includes 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 including a host material and a dopant, the ionization potential (Ips) of the main material forming the electron-injecting controlling layer and the ionization potential (Iph) of the host material of the emitting layer satisfying relationship (i) 0.5eV>Ips-Iph≥0 eV, and the electron mobility of the electron-transporting material forming the electron-transporting layer being 10<SP>-5</SP>cm<SP>2</SP>/Vs or more at the electric field intensity of 400 to 500 (V/cm)<SP>1/2</SP>. COPYRIGHT: (C)2010,JPO&INPIT |
