Patent ID: 7128982
Filing Date: 2006-10-31
Classification: H01L,Y10S,Y10T

Abstract:
1. 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 phosphorescent compound being a metal complex compound containing as a central metal, a metal belonging to a group VIII of the periodic table, the host compound having a band gap of from 3.3 eV to 5.0 eV, and having a molecular weight of not less than 500, and relationship 0.0<c/d≦0.4 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.