Abstract
In this paper, we first synthesized La1-xErxGa0.5Sb1·5O6 and Bi1-xErxGeSbO6 phosphors with rosiaite structure and studied their spectral luminescent properties. We demonstrated the influence of the matrix composition on the intensity ratio of the Er3+ luminescence bands, due to the transitions from the 2H11/2, 4S3/2, 4F9/2, 4I9/2, and 4 I11/2 excited states to the 4I15/2 ground state upon excitation to the 4I13/2 level. It is shown that the increase in the intensity ratio of the bands corresponding to the 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions is more pronounced for La1-xErxGa0.5Sb1·5O6 compounds compared to Bi1-xErxGeSbO6. This indicates that the processes of interaction in the studied matrices are different.Along with the luminescence of erbium, broadband thermal white-light emission was detected in highly doped samples after increasing the power density of the exciting radiation with λexc. = 1550 nm. For La1-xErxGa0.5Sb1·5O6 compounds, it occurs at a lower power density than for Bi1-xErxGeSbO6, which may be due to the features of interactions of RE ions with the host, as well as with the particle morphology.
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