Abstract
We show that the fast blue (maximum at about 3.0–3.2 eV) photoluminescence from spark processed silicon originates from tungsten doping when the sample is processed with a tungsten counter-electrode. A similar effect is found also for molybdenum and chromium. If a silicon tip is used as counter-electrode, the photoluminescence is about a factor of 30 weaker and red shifted with a maximum at about 2.2–2.3 eV. Because of the limited sensitivity of the RBS technique used, transition metal impurities, such as Zn, are suspected but cannot be definitively proven as the radiative centers in this case.
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