The low-temperature sonochemical synthesis of up-converting β NaYF4:Yb,Er mesocrystals

Near-infrared responsive magnetic photocatalyst based on NaYF4:Yb3+/Er3+@Cu2O@MoS2@Fe3O4 for the efficient degradation of organic contaminants

“…5(a), the emission bands of NYE UCMs are located in the visible region (∼523, ∼542, and ∼656 nm), assigned to the radioactive transitions of 2H 11/2 → 4I 15/2 , 4S 3/2 → 4I 15/2 and 4F 9/2 → 4I 15/2 , respectively. 16 Notably, the emission bands of NYE UCMs can overlap very well with the absorption features of Cu 2 O and MoS 2 in the visible region (see Fig. 4(a)), suggesting that the up-conversion energy transfer from NYE to Cu 2 O or MoS 2 is possible.…”

“…These activator ions then release photons within the UV-visible range, effectively driving the upconversion process. 16,17 Additionally, TiO 2 has become a focal point in the field of photocatalysis due to its chemical resilience, environmental friendliness, and powerful photocatalytic abilities. Integrating upconversion materials with TiO 2 extends the material absorption capabilities into the NIR region, which can lead to heightened photocatalytic efficiency.…”

Graphene Quantum Dots Modified Upconversion Nanoparticles for Photodynamic Therapy

“…Elemental mapping images in Figure S2 also proved this and showed that the distribution of elements C, N, and O was consistent with that of elements Y and Yb. The X-ray diffraction (XRD) patterns of the synthesized GQDs, UCNPs, and UCNPs@GQDs are presented in Figure 1 b. XRD profile of UCNPs clearly revealed their crystallization of the α phase (JCPDS 77-2042) [ 19 ]. The obvious peak located at 25° in the XRD pattern of GQDs arose from the 002-lattice plane [ 20 ].…”

Multiple fluorescence-temperature feedback in Y7O6F9:Er/Yb crystal-embedded polyacrylonitrile fibers

“…Some works have been reported on the temperature-dependent up-conversion luminescence of rareearth ions. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] Among various temperature-dependent fluorescence parameters, the temperature-based fluorescence intensity ratio (FIR) can circumvent the disturbances of the local environment and provide real-time feedback results. [41][42][43][44][45][46][47][48][49][50] In addition, Nd 3+ -based thermometers were proposed for bio-applications, and new multipurpose strategies, Cr 3+ -based Boltzmann thermometers, were demonstrated to be particularly promising.…”