Tm-based laser with emission at 2.3 μm could be used to detect atmosphere pollutants and various molecules. Within this work we investigated if oxide compounds could be efficient for this laser emission as complex energy transfers could occur such as non-radiative relaxation and upconversion. Several oxides hosts are investigated, namely CaGdAlO4 (CALGO), Y2O3, CaYAlO4 and CaYAl3O7 to host Tm3+ for laser effect at 2.3 μm. We focus on the optical characterizations and spectroscopic analysis of these materials, determining intrinsic optical features such as lifetime and broadening of the emission bands.
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- NaGd0.8Y0.17Er0.03F4 nanoparticles, known for their efficient upconversion, and Zn1.33Ga1.335Sn0.33Cr0.005O4 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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