Photoluminescence, thermoluminescence, and cathodoluminescence of optimized cubic Gd2O3:Bi phosphor powder

Abstract

Cubic Gd2 − xO3:Bix phosphor powders were prepared with a combustion method and the effect of different annealing temperatures and dopant concentration on the photoluminescence (PL), thermoluminescence (TL), and cathodoluminescence (CL) were investigated. A single-phase cubic crystal structure with the Ia3¯ space group was formed. The average crystallite size increased and decreased, respectively, with an increased annealing temperature and an increased Bi3+ doping concentration. Absorption bands at 250, 275, and 315 nm were observed due to 4f-4f transitions of the Gd3+ ions and at 260, 335, and 375 nm due to the excitation of Bi3+ ions. The emission was obtained from two centers associated with the substitution of the Gd3+ ions with Bi3+ ions at the two different sites in the crystal lattice of Gd2O3 (with a point symmetries C2 and S6). The TL glow curves of the UV-irradiated samples showed a low temperature peak at about 364 K and a high temperature peak at 443 K for all the samples. The surface and CL stability during electron irradiation was monitored. The CL emission of the Gd2O3:Bi was stable after removal of surface contaminants. The phosphor might be usable for solid state lighting and displays due to its broad blue-green emission.

Microstructural, morphological and optical properties of sprayed thin films of indium doped gadolinium oxide (Gd2O3: In)

“…Where Gd2-0.02In0.02O3 (2 at %) have the largest grain size between the doped samples and exhibits a better crystallinity compared to the others. So, the decrease of the mean crystallite size of our layers can be explain by the difference in the size of the radius between Gd 3+ ions (0.938 Å) and In 3+ ions (0.80 Å) where it may have caused a stress "ε ", leading to a disturbance in the crystallite growth kinetics [12].…”

“…Gadolinium oxide is an n-type semiconductor, large band gap, high order of transparency and high dielectric constant allowing him to be used firstly as thin film in optoelectronic devices [5], alternative gate dielectric of SiO2 [6], spectral converter [7]. Secondly as nanoparticles in biomedical domain as a contrast agent for imaging [8] either in its undoped form or by introducing some doping elements to Gd2O3 matrix such as Yb 3+ [9] Eu 3+ [10] Tb 3+ [11] Bi 3+ [12] toward investigating and refining the thin film properties to each desirable applications cited before.…”

Investigation of thermoluminescence and photoluminescence properties of Tb3+, Eu3+, and Dy3+ doped NaYF4 phosphors for dosimetric applications

“…The thermoluminescence glow curve corresponds to the intensity of light emitted versus temperature and the TL glow curve/peak is essentially associated with various traps and the recombination centers existing in the phosphor material. 44–46 The structure of the glow curve, such as the shape of the glow peak, glow peak temperature and intensity are substantially affected by certain factors such as the type of lanthanide dopant/impurity content, their concentration, annealing temperature, and the crystallinity of the material. 47–49 Therefore, the investigation of the influence of these mentioned parameters as dopants and annealing temperature on the glow curve structure is of particular significance in the research area of developing novel TL dosimetric materials.…”

Nanoscale Cathodoluminescence Thermometry with a Lanthanide-Doped Heavy-Metal Oxide in Transmission Electron Microscopy

“…Among numerous luminescent materials proposed for use as temperature probes, semiconductor nanodots − and organic molecules are often selected but are unsuitable for use in TEM as the high-energy electron beam incident on the luminescent probes facilitates their rapid degradation. In contrast, oxide particles doped with rare-earth ions are stable in aggressive chemical media, at high temperatures, and under ionizing radiation, , rendering them promising candidates for use in in situ temperature measurements in TEM.…”

“…Here, we propose using the nanoparticles of a heavy-metal oxide doped with europium ions (Eu 3+ ) to accurately and precisely measure in situ temperatures with a spatial resolution toward nanometers. We used gadolinium oxide (Gd 2 O 3 ) nanoparticles that have been reported as an efficient temperature probe in photoluminescence (PL) thermometry − with a superior resistance to electron-beam-induced damage . We propose a ratiometric approach, which is based on the thermally induced changes in the intensities of different emission bands and widely used in optical thermometry. , This method exhibits potential for use in applications in multiple types of in situ TEM studies to monitor the temperature evolution or thermal properties of materials at the nano- and microscales.…”