Strontium and strontium calcium aluminates and lanthanum and lanthanum magnesium borates activated with Pr.sup.3+ and Mn.sup.2+ exhibit characteristics of quantum-splitting phosphors. Improved quantum efficiency may be obtained by further doping with Gd.sup.3+. Refined rules for designing quantum-splitting phosphors include the requirement of incorporation of Gd.sup.3+ and Mn.sup.2+ in the host lattice for facilitation of energy migration.
FEDERAL RESEARCH STATEMENT
This invention was first conceived or reduced to practice in the performance of work under a contract with the United States Department of Energy, said contract having the contract number of DE-FC26-99FT40632. The United States of America may have certain rights to this invention.