Design of coherent wideband radiation process in a Nd-doped high entropy glass system.

We discover that the spatially coherent radiation within a certain frequency range can be obtained without a common nonlinear optical process. Conventionally, the emission spectra were obtained by de-exciting excited centers from real excited energy levels to the ground state. Our findings are achieved by deploying a high-entropy glass system (HEGS) doped with neodymium ions.

Magnetic tuning of upconversion luminescence in Au/NaGdF:Yb/Er nanocomposite.

Lanthanide-doped upconversion nanoparticles (UCNPs) NaGdF:Yb/Er have received increasing attention due to their unique optical-magnetic bifunctional properties. Here, we show that the luminescent intensity from NaGdF:Yb/Er nanoparticles decreases monotonously with increasing the applied magnetic field from 0 to 37.1 T, while plasmon-enhanced upconversion luminescence in Au/NaGdF:Yb/Er nanocomposite is independent of a magnetic field lower than 6 T.

Enhanced upconversion luminescence through core/shell structures and its application for detecting organic dyes in opaque fishes.

Here, we report the enhanced upconversion luminescence of NaLuF4:18%Yb(3+),2%Er(3+) through core/shell structures. Among NaYF4, NaGdF4, and NaLuF4 shells, the first one presents the highest efficiency. These upconversion fluorescent nanoprobes with an oleic acid/PEG hybrid ligand can efficiently capture Rhodamine B (RB) and sodium fluorescein (SF) in opaque fishes to present their residues in vivo through luminescence resonant energy transfer (LRET) processes.