Photoluminescence of Lanthanide Complexes. II. Enhancement by an Insulating Sheath

Abstract
The effect of an ``insulating sheath'' in reducing radiationless energy losses from a lanthanide chelate is postulated and techniques for developing this sheath are described. Data on luminescence of various europium chelates and synergic agent complexes are presented which demonstrate the efficacy of the sheath. A quantum efficiency approaching 80% is obtained for photoluminescence of a low viscosity hydrocarbon solution at room temperature.