This paper discusses various physical mechanisms that result in cascade photon emission. It is shown to be promising to use the Pr3+ ion as an activator for creating phosphors with a quantum efficiency greater than unity. The properties of the phosphors SrAl<sub>12</sub>O<sub>19</sub>:Pr and SrAlF<sub>5</sub>:Pr are discussed. © 2005 Optical Society of America

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