Abstract
High-quality pure PbF 2, Yb:PbF 2 and Yb, Na:PbF 2 crystals are grown by the Bridgman method in a nonvacuum atmosphere. Room-temperature absorption, photoluminescence spectra, and fluorescence lifetimes belonging to the transitions between ground state 2F 7/2 and the excited state 2F 5/2 of Yb 3+ ions in these crystals have been investigated. The influence of codoping with Na + ions on the spectra has been studied. Experimental results show that codoping Na + ions in different Na:Yb ratios can modulate the spectroscopy and photoluminescence properties of Yb 3+ ions in a PbF 2 lattice in a large scope: the Na + ions codoping with Yb 3+ as charge compensators can suppress the deoxidization of Yb 3+ to Yb 2+, enhance the luminescence intensity and lengthen luminescence lifetime of Yb 3+ ions.
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