A Comparison of the Intensities of Emission of Eu3+ and Tb3+ in Tungstates and Molybdates

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Abstract
The intensity of emission of Eu3+ is shown to vary with its electrostatic binding energy in the tungstates which have the scheelite structure. Increasing the polarization of the oxygens toward Eu3+ or Tb3+ appears to decrease the total binding energies of these ions in the tungstates and molybdates. Brightness can either increase or decrease with binding energy depending on the effectiveness with which the host structure can capture excitation energy and communicate it to the rare earth ions involved.