Energy transfer from Ce3+ to Eu2+ and electron transfer from Ce3+ to Eu3+ in BaY2F8 : Ce, Eu systems

Phorsphors of BaY2F8 : Ce3+, BaY2F8: EU2+ and BaY2F8 : Ce, Eu were prepared by higher temperature solid reaction and their excitation, emission and di ffuse reflection spectra were made. We firstly found that the competition o f energy transfer from Ce3+ to Eu2+ and electron transfer from Ce3+ to EU3 existed in CeF3 and EuF3-co-doped BaY2F8 systems. The f-f transition emiss ion of EU2+ was increased with increasing x in systems BaY2F8 : 0. 03Ce, xE U. Ce4+ ions coexist,with Ce3+ ions and substitute Y3+ for Ce4+ in the syst ems BaY2F8 : Eu, Cc.