Microwave hydrothermal synthesis and upconversion properties of Yb³⁺/Er³⁺ doped YVO₄ nanoparticles

Abstract

Yb and Er doped YVO (Yb/Er:YVO) nanoparticles with highly efficient near-infrared to visible upconversion properties have been synthesized by microwave hydrothermal process. Uniform-sized Yb/Er:YVO nanoparticles were synthesized within 1 h at 140 °C which is relatively faster than the conventional hydrothermal process. Under 980 nm laser excitation, strong green and less strong red emissions are observed which are attributed to H, S to I and F to I transitions of Er respectively. The emission intensity is found to depend strongly on the concentration of Yb. The quadratic dependence of upconversion intensity on the excitation power indicates that the upconversion process is governed by two-photon absorption process.

Balancing Dielectric Loss and Magnetic Loss in Fe–NiS2/NiS/PVDF Composites toward Strong Microwave Reflection Loss

“…The peak corresponding to the crystal plane (200) shifted to the direction of higher 2θ with increasing Fe 2+ concentration (Figure S1b). Since the ionic radius of Fe 2+ (0.061 nm) is smaller than that of Ni 2+ (0.069 nm), the replacement of Fe atoms for Ni atoms in the NiS 2 /NiS lattice results in the shrinkage of the crystal lattice . The lattice parameter can be calculated according to the formula where a is the lattice parameter and h , k , and l are the Miller indices.…”

“…Since the ionic radius of Fe 2+ (0.061 nm) is smaller than that of Ni 2+ (0.069 nm), the replacement of Fe atoms for Ni atoms in the NiS 2 / NiS lattice results in the shrinkage of the crystal lattice. 25 The lattice parameter can be calculated according to the formula…”

Generation of Pure Green Up-Conversion Luminescence in Er3+ Doped and Yb3+-Er3+ Co-Doped YVO4 Nanomaterials under 785 and 975 nm Excitation

“…One of the most commonly studied materials is YVO 4 doped with Yb 3+ -Er 3+ . In the case of this system, scientists typically use a conventional NIR laser emitting wavelength of 975-980 nm to generate UC emission [27,31,[51][52][53][54][55][56].…”

Simple Methods to Synthesize YVO4 Nanocrystals or Microcrystals without Any Templates or Surfactants

“…Rare earth orthovanadate is a kind of important oxide in materials science and technology [1][2][3][4][5][6][7][8][9][10][11][12]. And YVO 4 has wide applications in many fields, such as polarizer [13,14] and laser host material [15,16].…”