Abstract
Magnetic-optical bifunctional materials have attracted tremendous interest due to their potential applications in biomedicine as well as multifunctional sensors. However, much attention has been paid on the bifunctional materials rendering magnetic and optical behavior individually, rather than the interaction between magnetic field and optical process. In this paper, we examine the coupling of magnetic field with photoluminescence in Eu3+-doped NaGdF4 nanoparticles. The Zeeman effect induced by magnetic field is clearly observed from the shift of luminescence bands and the splitting of the emission peaks. Furthermore, the luminescence intensity of different transitions of Eu3+ in paramagnetic NaGdF4 exhibits a hysteresis behavior when the magnetic field is scanned between 0 and 40 T. Compared with the optical behavior of Eu3+ in the nonmagnetic NaYF4, this optical hysteresis behavior of luminescence intensity is tentatively ascribed to the magnetic response of the paramagnetic dopant ions in both hosts. Due to the high magnetic field sensitivity, the Eu3+-doped bifunctional nanoparticles could be used as optical probes in sensor and biomedical areas.
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