A simple, low-temperature route to synthesize aqueous-dispersible Yb3+–Er3+ co-doped hexagonal LaF3 nano-crystals for up-conversion fluorescence

Effectively Utilizing NIR Light Using Direct Electron Injection from Up‐Conversion Nanoparticles to the TiO2 Photoanode in Dye‐Sensitized Solar Cells

“…DSC photoanodes with TiO 2 /UCNPs nano‐heterostructures, a mixture of TiO 2 and UCNPs, or only TiO 2 were prepared using screen‐printing pastes based on the synthesized TiO 2 –UCNPs nanocomposites and control TiO 2 (P25) nanoparticles produced via Grätzel's method 19, 20. Photoanode 1 comprised four layers of transparent TiO 2 made with P25 (about 16 μm thickness) and one layer of TiO 2 –UCNPs nanocomposites (about 4 μm) thickness; it was sintered at 450 °C for 0.5 h in air.…”

Near‐Infrared Sunlight Harvesting in Dye‐Sensitized Solar Cells Via the Insertion of an Upconverter‐TiO2 Nanocomposite Layer

“…Two upconversion emission bands in the curve, centered at nearly 543 nm (green emission peak A, about ∼520–550 nm), and 655 nm (red emission peak B, about ∼650–670 nm), are observed, respectively, in both films. These bands correspond to two excitation routes from excited state 4 F 7/2 and 4 F 9/2 to the ground state 4 I 15/2 of Er 3+ under the 980 nm irradiation 23. However, the ratio of the intensities (evaluation by the area of the peak) of the two emissions is quite different between the naked UC–TiO 2 film and the N719‐sensitized one.…”

“…Screen‐printing pastes based on the synthesized UC–TiO 2 nanocomposites and the control TiO 2 nanoparticles were prepared via Grätzel’s method,22, 23 and different multi‐layer film electrode structures were fabricated and tested. The films consisted of a transparent TiO 2 layer made with the control TiO 2 nanoparticles (size ∼10–15 nm), a scattering TiO 2 layer prepared with the WER4‐O TiO 2 paste (Dyesol) that contains ∼350–450 nm sized TiO 2 particles, and with or without the UC–TiO 2 nanocomposite layer.…”

Nano- and microsized Eu3+ and Tb3+-doped lanthanide hydroxycarbonates and oxycarbonates. The influence of glucose and fructose as stabilizing ligands

“…[1][2][3][4] Among them lanthanide fluoride nanoparticles have received the most attention, and have been studied by various research groups. [5][6][7][8] Due to their low phonon energy, and therefore minimum quenching of emissive Ln 3+ ions, they were found to be suitable host materials for many optical applications. Additional evidence has been provided that when a lanthanide matrix is doped with emissive Ln 3+ ions, they distribute evenly within the whole matrix.…”

“…Eu 3+ and Tb 3+ ions were chosen because they show strong emission in the visible region. Additionally the Eu 3+ ion is often used as a structural probe because of its non-degenerated ground state 7 F 0 and non-overlapping 2S+1 L J multiplets. We applied two different reaction conditions: hydrothermal (autoclave reaction at 120 °C) and mild (85-90 °C).…”