Luminescence of Copper-Activated Calcium and Strontium Orthophosphates

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Abstract
Copper produces a strong luminescence in . Luminescence in occurs only in the presence of small amounts of foreign ions such as Ca, Zn, Cd, Mg, or Al. These additions give rise to a new crystal phase which is probably isomorphous with . The emission peaks under excitation with 2537Aå of , , and of modified with Al are found at 4800, 5700, and 4950Aå, respectively. Sensitization occurs with Mn, giving rise to a red emission peak. The temperature dependence of the fluorescence is good, especially that of and partly substituted with Mg and Ca. Phosphor application in lamps presents difficulties due to the materials' sensitivity to air at binder bake‐out temperatures.

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