Patent ID: 7476451

Claim:
An electroluminescent element comprising: an anode, a cathode, and an electroluminescence layer comprising a first layer and a second layer, wherein the first and second layers comprise a complex of a Group 4 metal of the periodic table represented by the general formula: wherein M represents a Group 4 element of the periodic table, and R1 to R6 independently represent a hydrogen, a halogen, a cyano group, an alkyl group having 1 to 10 carbon atoms, a haloalkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocycle residue, and wherein the second layer further comprises a light emitting material which has an emission wavelength with a maximum value within a range of 580 to 680 nm, wherein the metal complex represented by the general formula in the first layer is a guest material and the metal complex represented by the general formula in the second layer is a host material.