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Abstract
The mechanism of dissipation of electronic excitation energy of rare earth element (REE) ions into the vibration components of the closer and the farther surroundings is a problem of considerable theoretical and practical interest. Temperature quen ching of REI luminescence in chelates was studied in a number of papers/1 – 6/ which revealed the importance of the energy position of the lower triplet levels of the organic ligand and the resonance excited level of the REE ion. As the temperature is raised.