Effects of Heat Treatment and Yb 3+ Concentration on the Downconversion Emission of Er 3+ /Yb 3+ Co-Doped Transparent Silicate Glass-Ceramics

Abstract

The SiO 2-Al 2 O 3-BaF 2-TiO 2-CaF 2 transparent silicate glass-ceramics containing BaF 2 nanocrystals were successfully prepared by heat treatment process through conventional melting method. Effects of heat treatment processes and Yb 3+ concentration on the downconversion (DC) emission of the co-doped Er 3+ /Yb 3+ transparent silicate glass-ceramics were investigated. With the increase of temperatures and times of heat treatment process, the DC emission intensity of the co-doped Er 3+ /Yb 3+ glass-ceramics was significantly enhanced. At the same time, with the increase of Yb 3+ concentration, the value of DC intensity of Er 3+ /Yb 3+ co-doped bands centered at 849, 883 and 1533 nm is maximized when the concentration of Yb 3+ reaches 2.5 mol.%. When the concentration exceed 2.5 mol. %, the DC emission intensity of Er 3+ /Yb 3+ co-doped bands centered at 849, 883 and 1533 nm was decreased, owing to the self-quenching effect. It's interesting that the DC emission intensity of Er 3+ /Yb 3+ codoped band centered at 978 nm didn't quench when the Yb 3+ concentration exceed 2.5 mol. %. At the same time, the DC mechanism and ET processes between Yb 3+ and Er 3+ ions were discussed.

Fates of Au, Ag, ZnO, and CeO2Nanoparticles in Simulated Gastric Fluid Studied using Single-Particle-Inductively Coupled Plasma-Mass Spectrometry

“…The dissolved standard SP-ICP-MS signals were converted to the corresponding ENP sizes according to the mass fraction and density of the material. 40,42 The particle size detection limits of ZnO-NPs and CeO 2 -NPs were determined to be five times the standard deviation above the background intensity in MQ water. 28,29 Equation 1 was employed to measure the particle concentration detection limit (LOD):…”

“…The size detection limits for Au-NPs and Ag-NPs were determined by analyzing ENP standard suspensions of Au-NPs at 10,15,20,30,40,50,20,40,70, and 100 nm. The ICP-MS response intensities of Au-NPs vis size were linear from 15 to 80 nm, whereas for Ag-NPs, the linear range was from 20 to 100 nm.…”

“…28,32 SP-ICP-MS has been applied to several metal-based ENP analyses in different sample matrices, such as plant tissues, water, animal tissues, etc. 2,27,[31][32][33][34][35][36][37][38][39][40][41] However, to the best of our knowledge, SP-ICP-MS has not been widely applied to the analysis of ENPs in gastric fluid. Therefore, this SP-ICP-MS application for rapid and sensitive tracking of the metal-based ENP fate in gastric fluid represents a useful advancement in the field of ENP analysis.…”

Optical band gaps and spectroscopy properties of Bim+/Eun+/Yb3+ co-doped (m = 0, 2, 3; and n = 2, 3) zinc calcium silicate glasses

“…Curve ( a ) (black curve) in Fig. 2 is the absorption spectrum of Bi m + ions which has three main bands, generated by the transitions of Bi m + ions, with the peaks at ∼458, 653, and 700 nm, corresponding to 1 S 0 → 3 P 1 transition of Bi 3+ ions, 11,18,29 4 S 3/2 → 2 P 1/2 transition of Bi 0 ions, 14,15 and 2 P 1/2 → 2 P 3/2 (1) transition of Bi 2+ ions. 13 We did not analyze and discuss the absorption spectrum of Bi m + ( m = 0, 2, and 3) ions in detail in this study.…”

“…8 Details for EDS analysis, absorption spectra, VIS-, UC-, and NIR-emission spectra measuring and analyzing devices have been described in detail in our recent studies. 8,[27][28][29] 3. Results and discussion…”