Abstract
The role of Tb3+ ions, with respect to efficient energy transfer, on sensitization of Gd3+ ions in (La,Gd)PO4 has been investigated. A series of Tb3+ doped (La, Gd)PO4 were characterized by steady state spectroscopy and efficient energy transfer from Tb3+ 4f75d to Gd3+ 4f7 states was observed. The decay curves of Gd3+6P7/2 and Tb3+5D3, 5D4 states upon Tb3+ 4f75d and Gd3+6IJ states excitation were also performed to reveal the energy transfer processes. With the increase of Gd3+ concentration, the energy transfer efficiency increase accordingly. Based on steady state spectra, around 73% energy transfer efficiency in Gd0.99Tb0.01PO4 was determined.
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