Rare Earth Activated Phosphors Based on Yttrium Orthovanadate and Related Compounds

Abstract

The adoption of as a new red ‐emitting primary in color television has stimulated investigation of a new class of phosphors obtained by appropriate substitutions in . Substitution of Y³⁺ by Gd³⁺ and Lu³⁺ provides equally efficient hosts for Eu^{3 +} with no significant spectral differences. Substitution of Y³⁺ by La³⁺ leads to a less efficient host with important differences in the emission characteristics of Eu³⁺. Use of rare earth activators ether than Eu³⁺ provides a series of phosphors which emit over most of the visible range. Spectral data and preferred concentration ranges are presented as well as the effect of temperature on the fluorescent emission intensities.