Patent ID: 7592075

Claim:
An organic electroluminescence element comprising a hole transporting layer containing a hole transporting material, a light emission layer containing a host compound and a phosphorescent compound, a hole blocking layer, and an electron transporting layer, the light emission layer being in physical contact with the hole transporting layer, the hole transporting material having a ratio N/C of a nitrogen atom number N to a carbon atom number C of from 0.05 to 0.10, and relationship c<d being satisfied, wherein c (eV) represents a difference between energy level of LUMO (lowest unoccupied molecular orbital) in the hole blocking layer and energy level of LUMO in the light emission layer and d (eV) represents a difference between energy level of HOMO (highest occupied molecular orbital) in the hole blocking layer and energy level of HOMO in the light emission layer, and relationship a≧b+0.2 being satisfied, wherein a (eV) represents a difference between energy level of LUMO in the light emission layer and energy level of LUMO in the hole transporting layer and b (eV) represents a difference between energy level of HOMO in the light emission layer and energy level of HOMO in the hole transporting layer.