Journal
APPLIED PHYSICS LETTERS
Volume 76, Issue 25, Pages 3682-3684Publisher
AMER INST PHYSICS
DOI: 10.1063/1.126748
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Silica colloids with a diameter of 240-360 nm, grown by wet chemical synthesis using ethanol, ammonia, water, and tetraethoxysilane, were implanted with 350 keV Er ions, to peak concentrations of 0.2-1.1 at. % and put onto a silicon or glass substrate. After annealing at 700-900 degrees C the colloids show clear room-temperature photoluminescence at 1.53 mu m, with lifetimes as high as 17 ms. By comparing data of different Er concentrations, the purely radiative lifetime is estimated to be 20-22 ms, indicating a high quantum efficiency of about 80%. This high quantum efficiency indicates that, after annealing, the silica colloids are almost free of OH impurities. Spinning a layer of polymethylmethacrylate over the silica spheres results in an optically transparent nanocomposite layer, that can be used as a planar optical waveguide amplifier at 1.5 mu m that is fully compatible with polymer technology. (C) 2000 American Institute of Physics. [S0003-6951(00)00425-3].
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