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The up-conversion luminescence of Zn1−xMgxS:Mn2+ 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:Mn2+ 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:Mn2+ nanoparticles does not change when the excitation wavelength is tuned between 750 to 790 nm.
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Zhang et al. (2010) studied this question.
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