Improvement of quantum efficiency through Gd to Eu energy transfer in YF phosphor.

This paper reports the energy transfer from Gd to Eu in YF and the consequent downconversion luminescence for the YF :Gd , Eu fluoride phosphor. The phosphor was synthesized using a soft chemical route, followed by a reactive atmosphere process. Because of the wide band gap in YF and the correct energy site for S - G transitions of Gd ions, fluoride YF doped with Gd -Eu were studied in their vacuum-ultraviolet (VUV) spectral regions.