Abstract

The orthophosphate phosphors, ${\mathrm{Ba}}_3\mathrm{La}{\left(\mathrm{P}{\mathrm{O}}_4\right)}_3$ activated with ${\mathrm{Dy}}^{3+}$ and ${\mathrm{Gd}}^{3+}–{\mathrm{Dy}}^{3+}$ ions, were prepared by a solid reaction technique at high temperature. Their spectroscopic properties were investigated in the vacuum ultraviolet (VUV)–visible range. We found that the introducing of ${\mathrm{Gd}}^{3+}$ greatly enhances the ${\mathrm{Dy}}^{3+}$ luminescence under $172\mathrm{nm}$ VUV excitation. The measurements on excitation spectra, emission spectra, and luminescence decay curves revealed that the energy transfer between ${\mathrm{Gd}}^{3+}$ and ${\mathrm{Dy}}^{3+}$ becomes more and more efficient with the increasing ${\mathrm{Gd}}^{3+}$ contents.

© 2008 Optical Society of America

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