Efficient Sensitization of Eu3+Emission by Tb3+in Ba3La(PO4)3under VUV-UV Excitation: Energy Transfer and Tunable Emission

The work presents the VUV-UV-vis photoluminescence of Ba3La(PO4)3:Ln3+ (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 revealed that Tb3+ can efficiently transfer excitation energy to Eu3+ via its 5d and 4f states and therefore sensitizes Eu3+ emission under VUV-UV excitation, results in tunable emission in a large color gamut.