Lead- and Manganese-Activated Calcium Cadmium Silicate Phosphors

Abstract

The preparation and properties of (Pb+Mn) ‐activated calcium cadmium silicate phosphors with various mole ratios of Cd to Ca are described. All phosphors produce a main, broad and variable emission band in the orange, and three minor, narrow and invariant bands at about 6880, 6950, and 7050Aå. The phosphors show a complicated shift of the main emission band with increasing Cd content, despite a linear relationship between Cd content and lattice spacings. The introduction of sulfate ions into the phosphor base changes the emission characteristics. With half of the Ca introduced as sulfate, the peak emission shifts from 6100, to 6200Aå. The results are discussed in the light of several assumptions.