Modeling the fluorescent lifetime of Y2O3:Eu

Abstract

Phosphor thermography, relying on the temperature dependence of the decay time of photoluminescence from suitable phosphors, provides remote measurement of the temperature of components. Such a phosphor is yttrium oxide doped with europium (Y2O3:Eu). Associated with this phosphor is also a rise time. Demonstrated is that the rise time is also temperature dependent, as a result of known electronic transitions within the Eu ions. For the phosphor Y2O3:Eu (3.4 at.%), the rise time is an activated process in the temperature region between 25 and 850 °C. Faster than the decay time, the rise time offers the opportunity for measurement of higher velocity components.

ZnO:Eu thin-films: Sol–gel derivation and strong photoluminescence from 5D0→7F0 transition of Eu3+ ions

“…The 5 D 0 → 7 F 0 transition at ∼580 nm is theoretically forbidden due to the same total angular momentum, so it is always inexistent or much weaker than the 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 transitions [3][4][5][6][7]. However, in this paper, strong 5 D 0 → 7 F 0 transition of Eu 3+ ions in the ZnO:Eu films will be reported, and the related mechanism will be preliminarily explained.…”

“…It should be noted that the RE luminescent properties strongly depend on the symmetry around them. Eu-doped semiconductors (such as ZnO and GaN) [3,4] and insulators (such as Al 2 O 3 , Y 2 O 3 and SiO 2 ) [5][6][7] have been applied in thin-film electroluminescent devices [8], optoelectronic or cathodoluminescent devices [9] and telecommunications and lasers [10]. The popular routes to preparing ZnO:Eu films mainly belong to the chemical solution deposition, for example, spray pyrolysis [11] and sol-gel process [12][13][14][15][16].…”

Effects of Phonon Confinement on Anomalous Thermalization, Energy Transfer, and Upconversion in Ln3+‐Doped Gd2O3 Nanotubes

“…All the emission decay curves are well reproduced by a single exponential function, except for the low Eu 3þ -content (0.16% and 1.00%) nanotubes, whose decay curves display a rise time component assigned to the nonradiative energy transfer between the 5 D 1 level of the Eu 3þ (S 6 ) ions and the 5 D 0 level of the Eu 3þ (C 2 ) ones. [47] The estimated lifetime values are always longer than the lifetime values of the microcrystals (1.00 AE 0.01 ms, at 11 and 300 K), indicating a small effective refraction index (or filling factor [48] ) for the nanocrystals. For instance, the 5 [14] , which were 2.19 (10 K) and 2.01 ms (295 K), due to differences in the morphology of the two samples; the nonsolid medium surrounding the nanotubes could change the effective index of refraction (or filling factor) and consequently the radiative lifetime.…”

Temperature dependent characteristics of La2O2S: Ln [Ln=Eu, Tb] with various Ln concentrations over 5–60°C

“…This is attributed to their accurate sensing capability over a wide range of temperatures, as well as their ability to withstand a harsh environment. For example, europium doped yttrium oxide (Y 2 O 3 : Eu) has been utilised for high temperature sensing within a rotating gas turbine [1,2] and magnesium fluorogermanate doped with manganese (Mg 4 (F)GeO 6 : Mn) has been explored for thermal mapping of hot spots on the walls of a cryogenic fuel tank [3] . Problems associated with temperature monitoring within a magnetic resonance imaging (MRI)…”