Organic electroluminescent element and production method thereof

An organic electroluminescent element comprising at least a light emitting layer containing an organic light emitting material placed between an anode and a cathode, wherein the element comprises:

• (i) between the anode and the light emitting layer, at least a hole transporting layer containing a hole transporting material and an acceptor, and an electron injection restraining layer restraining the injection of electrons from the light emitting layer into the hole transporting layer, from the anode side, and/or (ii) between the light emitting layer and the cathode, at least an electron transporting layer containing an electron transporting material and a donor, and a hole injection restraining layer restraining the injection of holes from the light emitting layer into the electron transporting layer, from the cathode side;
• wherein the electron injection restraining layer and the light emitting layer are constituted by materials meeting the following formula
• |Ea(A)||Ea(EBL)| and |Ea(EM)||Ea(EBL)|
• wherein Ea(A) represents the electron affinity of the acceptor, Ea(EBL) represents the electron affinity of a material of the electron injection restraining layer, and Ea(EM) represents the electron affinity of a material of the light emitting layer;
• and
• wherein the hole injection restraining layer and the light emitting layer comprise materials meeting the following formula:
• |Ip(D)||Ip(HBL)| and |Ip(EM)||Ip(HBL)|
• where Ip(D) represents the ionization potential of a donor, Ip(HBL) represents the ionization potential of a material of the hole injection restraining layer, and Ip(EM) represents the ionization potential of a material of the light emitting layer.

An organic electroluminescent element comprising at least a light emitting layer containing an organic light emitting material placed between an anode and a cathode, wherein the element comprises:

• (i) between the anode and the light emitting layer, at least a hole transporting layer containing a hole transporting material and an acceptor, and an electron injection restraining layer restraining the injection of electrons from the light emitting layer into the hole transporting layer, from the anode side, and/or (ii) between the light emitting layer and the cathode, at least an electron transporting layer containing an electron transporting material and a donor, and a hole injection restraining layer restraining the injection of holes from the light emitting layer into the electron transporting layer, from the cathode side;
• wherein the hole injection restraining layer and the light emitting layer comprise materials meeting the following formula:
• |Ip(D)||Ip(HBL)| and |Ip(EM)||Ip(HBL)|
• where Ip(D) represents the ionization potential of a donor, Ip(HBL) represents the ionization potential of a material of the hole injection restraining layer, and Ip(EM) represents the ionization potential of a material of the light emitting layer.