Nd3+ concentration effect on luminescent properties of MgAl2O4 nanopowders synthesized by modified Pechini method

Er‐Doped MgAl2O4 Nanofilms Enabling Highly Efficient Near‐Infrared Electroluminescence from the Silicon‐Based MOS Devices Fabricated by Atomic Layer Deposition

“…[23,24] Particularly, due to the cluster of Frenkel defect pairs in MAO spinel, the occupation of cations (Mg 2+ or Al 3+ ) at diverse sites is changed and the O interstitials recombine with the vacancies, which result in the structure transformation from ordered spinel to disordered spinel and further to disordered rock-salt. [25,26] Therefore, except the substitution of Mg 2+ and Al 3+ ions, Er 3+ ions enter into the vacancy sites, [27] resulting in the subsequent difference in EL performance. The SEM and AFM images of the A 3 samples that annealed from 700 °C to 1150 °C are compared in Figure 3a-f,h-m, respectively.…”

“…Herein the calculated value of R c (18.96 Å) is bigger than 5 Å, so it can be concluded that the exchange interaction is not responsible for non-radiative energy transfer between Er 3+ ions in these spinel nanofilms, and the concentration quenching is caused by the multipolar interaction mechanism. [25,40] Multipolar interaction includes dipole-dipole (d-d), dipole-quadrupole (d-q), and quadrupole-quadrupole (qq) interactions, whose types can be determined by using Equation (2) [41,42] :…”

“…Herein the calculated value of R c (18.96 Å) is bigger than 5 Å, so it can be concluded that the exchange interaction is not responsible for non‐radiative energy transfer between Er 3+ ions in these spinel nanofilms, and the concentration quenching is caused by the multipolar interaction mechanism. [ 25,40 ] Multipolar interaction includes dipole–dipole (d–d), dipole–quadrupole (d–q), and quadrupole–quadrupole (q–q) interactions, whose types can be determined by using Equation () [ 41,42 ] : $$$$\begin{equation}{1 \over X} = k{{\left[ {1 + \beta {{{\left( X \right)}}^{\theta /3}}} \right]}^{ - 1}}\end{equation}$$$$where I and X are the integral intensity and the activator concentration, k and β are the constants for the same excitation condition in a given host crystal. Accordingly, θ = 3 represents the energy transfer among the nearest neighbor ions, while θ = 6, 8, and 10 correspond to the d–d, d–q, and q–q interactions, respectively.…”

Evaluation of the Structural, Near-Infrared Luminescence, and Radioluminescence Properties of Nd3+ Activated TTB-Lead Metatantalate Phosphors

“…Therefore, the RE ion activated phosphors lead to numerous innovations in the development of new generation devices in various fields such as screen-display technology, lighting technology, and optical data communication due to some positive features such as long life, energy saving, improved physical durability, small size, fast switching, high efficiency, and environmental friendliness (1- 19). The trivalent neodymium ion (Nd 3+ ), one of the oldest trivalent lanthanide ions used in solid-state laser, is well known for its useful laser transitions such as F3/2→ 4 I9/2, 4 F3/2→ 4 I11/2, and 4 F3/2→ 4 I13/2 (20)(21)(22)(23)(24)(25)(26)(27)(28)(29). The 4 F3/2→ 4 I9/2 transition at 880 nm finds application as a powerful diode laser transition while the 4 F3/2→ 4 I11/2 transition stands out due to its easily operated at room temperature and pumped efficiently by flash lamp (29).…”

Synthesis of weakly-agglomerated luminescent CaWO4:Nd3+ particles by modified Pechini method

“…The samples presented in this work were synthesized with the modified Pechini method that has been proven to yield high quality crystalline particles of Y3Al5O12, YVO4, MgAlO4, Lu2(WO4)3 doped with various REI [5,[14][15][16]. This method is based on reactions between composite oxides in a hightemperature solvent -a salt melt [17].…”