Up-conversion luminescence of Mn2+ ions in Zn1−xMgxS:Mn nanoparticles
نویسندگان
چکیده
The up-conversion luminescence of Zn1−xMgxS: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 Zn1−xMgxS:Mn 2+ nanoparticles shifts several nanometers to the red side due to quantum confinement effect and site-selected Mn2+ 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 Zn1−xMgxS:Mn 2+ nanoparticles does not change when the excitation wavelength is tuned between 750 to 790 nm. © 2010 American Institute of Physics. doi:10.1063/1.3391384
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