ChemInform Abstract: Microwave‐Assisted Solvothermal Synthesis and Characterization of SnO₂: Eu³⁺ Phosphors.

Abstract

Phosphors. -The title phosphors are prepared from SnCl4 and urea in a molar ratio of 1:15 dissolved in H2O, H2O/EtOH, or EtOH, and Eu2O3 dissolved in diluted HNO3 (double walled vessel in a microwave system, 150°C, 10 min, followed by calcination at 1200°C in air for 2 h). The samples are characterized by XRD, SEM, and photoluminescence spectroscopy. The solvent significantly influences the morphology and luminescent properties of the obtained phosphors. Using EtOH as a solvent leads to the formation of spherical phosphors with enhanced luminescent properties. SnO2:Eu 3+ phosphors show reddish-orange emission under excitation at 314 nm and display a broad excitation band in the range 240-370 nm.

Reducing Grain Size and Enhancing Luminescence of NaYF4:Yb3+, Er3+ Upconversion Materials

“…It is considered that the lower dielectric constant of solvent tends to induce the lower diffusion rate and solubility of the ions in the solution, and thus the smaller size is obtained. 48 The higher viscosity can also slow down the growth rate and tend to limit crystal growth, leading to the smaller grain size. 49 Meanwhile, the lower boiling point of the solvent will give rise to a higher saturated vapor pressure which may suppress the growth of the particles, and thus lead to the decrease of the particle size.…”