| http://www.w3.org/ns/prov#value | - In the optical device of the third aspect of the present invention, M is an element of the periodic table 2A or an element of the table 2B or Zn; L1, L2 and L3 each are a ligand derived from a compound having a hydroxyl group and an aromatic nitrogen atom (N) within the molecule and being represented by the following structural formula (A), wherein the hydrogen atom of the hydroxyl group is elimin
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