Patent ID: 8445118

Claim:
A coating liquid including one or more of metal complexes including aromatic rings, the one of more metal complexes being selected from a metal complex A represented by Chemical Formula 1, a metal complex B represented by Chemical Formula 2, and a metal complex C represented by Chemical Formula 3, wherein M in Chemical Formula 1, Chemical Formula 2 and Chemical Formula 3 represents a metal ion; each of X 1 -X 4 in Chemical Formula 1, Chemical Formula 2 and Chemical Formula 3 is one of O, NH, CO 2 and S; each of Y 1 -Y 8 in Chemical Formula 1 and Y 1 -Y 4 in Chemical Formula 3 is either CH or N; each of Z 1 -Z 3 in Chemical Formula 2 and Chemical Formula 3 and Z 4 -Z 6 in Chemical Formula 2 is one selected from a group consisting of O, NH and S, and two selected from a group consisting of CH and N; L in Chemical Formula 1, Chemical Formula 2 and Chemical Formula 3 represents an axial ligand; and k in Chemical Formula 1, Chemical Formula 2 and Chemical Formula 3 represents a valence of each of the metal complexes and is equal to a sum of electric charges of M, X 1 -X 4 and L.