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Spectroscopic properties of Pb2+ in different fluoride host lattices were studied in order to investigate if Pb2+ can serve as a sensitizer for the Gd3+–Eu3+ quantum cutting system. Strong B′ emission of Pb2+ was found in several fluoride host lattices and for the first time B′ emission is reported at room temperature. It is shown that sensitization of the 6G levels of Gd3+ is possible via B′ emission of Pb2+ in the host lattice (BaF2)0.6(GdF3)0.4 and visible quantum cutting with an efficiency of 20% is observed upon excitation in the C band of Pb2+. The possibility of sensitization of Gd3+ by A′ emission of Pb2+ in KMgF3 is discussed. [Copyright &y& Elsevier]

Abstract: Doubly doped BaY2F8:Er,Nd scintillation crystals were grown by modified micro-pulling-down method. The Er co-doping was chosen to enhance the energy transfer from the host lattice to the Nd3+ luminescence center via the 5d-levels of Er3+, which can be enabled by the overlap of Er3+ 5d-4f emission spectrum with the Nd3+ 4f-5d absorption. The energy transfer was clearly evidenced in the BaY2F8:Er,Nd. The processes are complicated by energy migration to killer centres and/or cross-relaxation processes. The luminescence and energy transfer mechanism are discussed. [Copyright &y& Elsevier]