In this study, we analyze the effect of Tb3+ concentration on the structural and optical properties of CaF2 terbium-doped thin films deposited on soda-lime glass substrates with an indium tin oxide (ITO)-sputtered coating by means of electrochemical processes. Compositional results showed that thin films have excess of F, which is believed to be the source for defect formation. XRD results showed not only shifting and widening of the CaF2 peaks as a function of [Tb3+] increase in the electrolitic solution but also an additional peak when high [Tb3+] are used, promoting thus the formation of secondary phases such as NaTbF4. According to photoluminescence (PL) results, when using UV excitation (λ = 325 nm), CaF2:Tb3+ thin films presented green emission (5D4 → 7FJ, where J = 6, 5, 4, 3, 2, 1, 0). Besides, PL studies not only allowed us to establish the quenching for Tb3+ concentration in the CaF2 matrix, but they also showed that there are no changes in intensity or peak position attributed to the presence of cubic NaTbF4 because its emission coincides with that of CaF2 terbium-doped thin films.
Calcium fluoride Thin films Lanthanides Electrodeposition
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This work was partially supported by Red Tematica Materiales Funcionales PROMEP-SEP (México), DGPI BUAP (México), and CONACYT under Grant 167993. All the authors contributed equally to this work.
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