| abstract |
An organic electroluminescence device having at least a light emitting layer between an anode and a cathode, wherein the light emitting layer includes a phosphorescent organometallic complex and at least one host compound, The difference in relative dielectric constant of the phosphorescent organometallic complex is 0 to −0.5, and the dipole moment difference between the host compound and the phosphorescent organometallic complex is 0 to −5.5 debye. It is. |