Up-conversion luminescence of Mn~(2+) ions in Zn_(1-x)Mg_xS:Mn~(2+) nanoparticles

摘要

The up-conversion luminescence of Zn_(1-x)Mg_xS: Mn~(2+) nanoparticles fabricated by an inorganic precipitation method is studied by using a near-infrared femtosecond laser. The up-converted luminescence is blueshifted when increasing the Mg composition because of weaker crystal field effect. Comparing with thin films, the luminescence of Zn_(1-x)Mg_xS: Mn~(2+) nanoparticles shifts several nanometers to the red side due to quantum confinement effect and site-selected Mn~(2+) excitation. The measured power dependence shows that a second-order absorption process is responsible for the up-conversion luminescence. The up-conversion luminescence peak of the Zn_(1-x)Mg_xS: Mn~(2+) nanoparticles does not change when the excitation wavelength is tuned between 750 to 790 nm.