Efficient Sensitization of Eu~(3+) Emission by Tb~(3+) in Ba3La(PO4)3 under VUV-UV Excitation: Energy Transfer and Tunable Emission

摘要

The work presents the VUV-UV-vis photolumines-cence of Ba3La(PO4)3:Ln~(3+) (Ln = Tb, Eu) prepared by a high-temperature solid-state reaction route. The excitation and emission spectra, the fluorescence decays, and the time-resolved emission spectra were measured and discussed in detail. The results reveal that Tb~(3+) can efficiently transfer excitation energy to Eu~(3+) via its 5d and 4f states and therefore sensitizes Eu~(3+) emission under VUV-UV excitation, resulting in tunable emission in a large color gamut.