Crystal structure, NIR luminescence and X-ray computed tomography of Nd³⁺:Ba_0.3Lu_0.7F_2.7 nanospheres

Encapsulation of Upconversion Nanoparticles in Periodic Mesoporous Organosilicas

“…Indeed, the nanoparticles were placed in a plastic tube as a powder. The presence of the Lu atom led to X-ray absorption of BaLuF 5 : Yb 3+ -Er 3+ @Ethane with a good contrast observed as already seen with bare Lu-based nanospheres [19]. BaLuF 5 : Yb 3+ -Er 3+ @Ethane could thus be used as contrast agents for X-ray CT.…”

“…Indeed, upconversion nanoparticles present attractive features [15] such as near-infrared excitation at low power with deep penetration in living tissues, and biocompatibility in vivo when stabilized with dendrimers [16], or a mesoporous silica shell [17,18]. The matrix is usually NaYF 4 , but using Lu 3+ instead of Y 3+ endows the nanoparticles with X-ray sensitivity [19,20]. In the present work, we studied the encapsulation of upconversion NaYF 4 : Yb 3+ -Er 3+ or BaLuF 5 : Yb 3+ -Er 3+ nanoparticles with bis(triethoxysilyl)ethylene or bis(triethoxysilyl)ethane as the PMO precursors.…”

Recent advances of near infrared inorganic fluorescent probes for biomedical applications

“…For instance, Becerro et al 48 reported Nd 3+ -doped Ba 0.3 Lu 0.7 F 2.7 NPs, which can be used for bimodal CT and fluorescence imaging.…”

Design of a nanoprobe for high field magnetic resonance imaging, dual energy X-ray computed tomography and luminescent imaging

“…The core NPs were synthesized using a method previously described by us to get uniform Ba0.3Lu0.7F2.7 NPs, 35 slightly modified to obtain Eu 3+ -doped Ba0.3Lu0.7F2.7 NPs. The method consisted in aging an EG solution (total volume = 10 mL) of lutetium acetate and europium acetate ([Lu + Eu] = 0.01 M), barium nitrate (0.01 M) and [BMIM]BF4 ionic liquid (0.5 mL) for 15 hours using an oven preheated at 120 ºC.…”

“…The use of the [BMIM]BF4 ionic liquid in our system has a double purpose: it is the source of fluoride anions and can act in turn as a capping agent during the particles growth. 35 The resulting suspension was cooled down to room temperature and washed twice with ethanol and once with double distilled water through centrifugation at 14000 rpm for 20 minutes. The NPs were finally dispersed in distilled water.…”