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Local structure around Er in MeV Er-implanted silica
Published online by Cambridge University Press: 15 February 2011
Abstract
Amorphous SiO2 films, 10 μm thick, were grown on Si(100) substrates and subsequently implanted with 5.0×1015 Er ions/cm2 at an energy of 3.5 MeV. When optically pumped at λ = 488 nm, the implanted films show a sharply peaked photoluminescence spectrum centred around λ. = 1.54 μm, corresponding to an intra-4f transition of Er3+. Thermal treatment at temperatures above 700 °C is needed to anneal out the implantation-induced defects and attain a maximum PL intensity and luminescence lifetime (15 ms). Extended x-ray absorption fine structure (EXAFS) spectra of Er-implanted bulk silica samples (3.4×1016 ions/cm2, 2.9 MeV) indicate that the Er has six O first neighbours at a distance around 2.25 Å. The results are similar to those for bulk samples doped with Er in the molten phase.
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