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Complexes With Rare Earth Metals, Process For Its Production, And Its Application. The [...] trivalent rare earth ([...] + 3 ^, [...] + 3 ^, [...] + 3 and + 3 ^ ^ [...]) coordinated to organic ligands exhibit emission in the region of the infrared and/or visible, which have potential application in optical devices. And trivalent gadolinium complexes exhibit properties that act as load conveyances builders in the operating method of optical devices.