Up-conversion luminescence from neodymium ion implantation silicon

Strong ultra-violet and visible frequency up-conversion fluorescence spectr oscopy in neodymium-ion implantation single crystalline silicon at the exci tation wavelengths of 625, 650, 675 and 700 nm, was experimentally investig ated. The PL intensity increased with the increase in the excitation wavele ngth and ion fluence. The photoluminescence excitation (PLE) spectrum in th e wavelength range of 500-770 mm was also studied. For 700-nm pumping, a me chanism of two-photon absorption and radiation transition process was propo sed. (C) 2000 Elsevier Science S.A. AU rights reserved.