Abstract
We report on photoluminescence studies of in a polycrystalline cryolite type host. The location of the in the center of inversion forbids the electric-dipole transitions of terbium ions in this material. As a consequence almost the entire luminescence intensity is related to the magnetic-dipole transition, and it is contained in the extremely narrow spectral bandwidth amounting to at and to at room temperature. The phosphor under study can be efficiently excited making use of intense transitions of in the UV–vacuum-UV region and may be of interest for applications requiring high spectral purity of the emission.
© 2008 Optical Society of America
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