Patent ID: 8299458

Claim:
An organic EL device provided with at least a hole injection layer, a hole transport layer, a light-emitting layer and an electron transport layer between an anode and a cathode, wherein: an ionization potential Ip(HIL) of material of the hole injection layer, an ionization potential Ip(HTL) of material of the hole transport layer, and an ionization potential Ip(EML) of material of the light-emitting layer respectively satisfy the relationship of Ip(EML)>Ip(HTL)≧Ip(HIL)≧Ip(EML)−0.4 eV, and wherein an acceptor dopant is added to the hole injection layer, and an electron affinity X(A) of the acceptor dopant added to the hole injection layer is represented by: X(A)≧Ip(HIL)−0.3 eV.