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The influence of bismuth on erbium optical properties at 1.54 μm has been investigated in yttrium-erbium disilicate thin films synthesized by magnetron co-sputtering and implanted with two Bi different doses. The Bi depth distribution and the evolution of its oxidation states after annealing treatments at 1000 °C in two atmospheres, O2 and N2, have been investigated. It was found that only in O2 the Bi3+ valence state is prevalent, thanks to the enhanced Bi mobility in the oxidizing ambient, as demonstrated by Rutherford backscattering spectrometry. At lower Bi content, although the formation of Bi0 metallic nanoparticles that are deleterious non radiative channels for Er luminescence, efficient energy transfer from Bi to Er has been obtained only in O2. It is due to the excitation of ultraviolet broad Bi3+ absorption band and the energy transfer to Er ions. We have evaluated that in this case, Er effective excitation cross …
AIP Publishing LLC
Publication date: 
28 Sep 2014

Adriana Scarangella, Maria Miritello, Francesco Priolo

Biblio References: 
Volume: 116 Issue: 12 Pages: 123511
Journal of Applied Physics