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Luminescence of 1-octadecene-coated silicon nanoparticles with 8 nm crystalline core in hexane and CCl4 colloidal solutions and its reversible photobleaching were examined. In agreement with previous reports, anti-correlation of luminescence intensity and the number of paramagnetic defects were found in hexane. Luminescence intensity is decreased by 75% during 30 min of 405 nm laser irradiation while...