| 摘要 |
A main object of the present invention is to provide a highly efficient and long-lasting organic EL element which comprises no layer that prevents penetration of holes and electrons to the counter electrode. To attain the object, the present invention provides an organic EL element comprising: an anode, a hole injecting and transporting layer formed on the anode, a light emitting layer formed on the hole injecting and transporting layer, an electron injecting and transporting layer formed on the light emitting layer, and a cathode formed on the electron injecting and transporting layer, wherein a relation of Ip 2 ‰§Ip 3 is established when an ionization potential of a constituent material for the light emitting layer is Ip 2 and an ionization potential of a constituent material for the electron injecting and transporting layer is Ip 3 , and characterized in that a relation of Ea 1 ‰§Ea 2 is established when an electron affinity of a constituent material for the hole injecting and transporting layer is Ea 1 and an electron affinity of the constituent material for the light emitting layer is Ea 2 . |
