Abstract
The luminescence and energy transfer of cerium and terbium codoped Ba2Mg(PO4)2 were investigated. The phosphor was prepared by a solid-state reaction at high temperature. The photoluminescence properties were investigated under UV excitation. From a powder X-ray diffraction analysis, the formation of single-phased Ba2Mg(PO4)2 with a monoclinic structure was confirmed. The photoluminescence excitation spectrum of Ba2Mg(PO4)2:Ce3+ shows that the excitation band from 220 to 350 nm and the broad-band UV-blue emission are attributed to the allowed 4f ↔ 5d transitions of Ce3+. Upon excitation of Ce3+ band, Ba2Mg(PO4)2:Ce3+,Tb3+ phosphors exhibit both Ce3+ emission band the characteristic Tb3+ emission lines. Also, efficient energy transfer from Ce3+ to Tb3+ in Ba2Mg(PO4)2 was verified by observing the excitation spectra of Ba2Mg(PO4)2:Ce3+,Tb3+. An energy level scheme is constructed to depict the energy transfer process.
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