Method of making improved strontium magnesium pyrophosphate phosphor activated by divalent europium

摘要

Divalent europium activated strontium magnesium pyrophosphate phosphors (SrMgP2O7:Eu2+) having improved brightness when used in low pressure mercury vapor lamps are prepared by using EuPO4x H2O as the europium source and firing in covered containers. Also disclosed is a novel method for preparing EuPO4 x H2O.