Abstract
Charging persistent luminescence materials using an infrared laser as a power source and an upconversion process allows expanding the potential applications for these materials. In bioimaging at the nanoscale, it allows increasing recharge ability capacity, as the excitation wavelength is fully inside the biological window. In this work, we propose a novel approach to this phenomenon using energy transfer on associated materials. For this purpose, we have synthesized β- NaGd<sub>0.8</sub>Y<sub>0.17</sub>Er<sub>0.03</sub>F<sub>4</sub> nanoparticles, known for their efficient upconversion, and Zn<sub>1.33</sub>Ga<sub>1.335</sub>Sn<sub>0.33</sub>Cr<sub>0.005</sub>O<sub>4</sub> nanoparticles known for their persistent luminescence properties, and we have associated them through a dry impregnation method. The obtained hybrid material presents persistent luminescence after charging with a 980 nm laser. A mechanism is proposed to explain the energy transfer process.
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