Luminescence properties of Y0.95−x M x Eu0.05B1−y R y O3 (M = Ca, Sr, Ba, Zn, Al, 0 ≤ x ≤ 0.1; R = Si, P, 0 ≤ y ≤ 0.1) in UV and VUV regions

Excitation energy migration dynamics in upconversion nanomaterials

“…In contrast to the basic ETU model, it is a relatively ''long-range'' interaction process, which was named by Wang et al as an ''energy migration-mediated upconversion'' (EMU) process. In 2011, they designed a donor and acceptor spatially separated core-shell-shell structure, 18 as shown in Fig. 5.…”

Ultra-small fluorescent inorganic nanoparticles for bioimaging

“…178 The authors attributed the high brightness to a combination of high excitation intensity, increased 95 energy migration without long-lived intermediate energy states. 182,183 In up-conversion nanoparticles, minimizing the depletion of excitation energy is the key to tuning their luminescence. The excitation energy can randomly migrate from an atom to its This allows to minimize the concentration quenching of the 5 luminescence, and generates an unusual four-photon-promoted violet up-conversion emission from KYb 2 F 7 :Er (2 mol%) with an intensity more than eight times higher than that previously reported.…”

Near-Net-Shape Tungsten–Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

“…and Wang et al 12,13) In the work of Wu et al, 9) technique of PSF for large-scale tungsten tubular heating elements was introduced. Rea et al 10) explored and characterized vacuum plasma spray formed tungsten parts reinforced by nanoscale HfC particles.…”

“…They have studied operating parameters (plasma arc gas type and flow-rate, plasma gun nozzle size and spray distance) and their effects on density and microstructure of the deposits. Recently, 95W3.5Ni1.5Fe thin-walled products fabricated by PSF and vacuum liquid phase sintering were reported by Wang et al 12,13) The relations between microstructure and mechanical property before and after liquid phase sintering were investigated. A five-stage sintering mechanism (including solid state sintering and recrystallization, liquid phase formation and infiltration, solution and precipitation, particle rearrangement, solution-precipitation and coalescence) were firstly proposed and then double checked by experimental results.…”