Thermoluminescence responses from europium doped gadolinium oxide

Abstract

Thermoluminescence signals and morphological studies are reported for a new phosphor of Gd2O3. The phosphor particle material was synthesized by an aerosol technique and it is heavily doped with Eu. Annealing at 1200 °C increases the luminescence efficiency by ∼1000-fold relative to the as-prepared material. The emission spectra are primarily from the red transitions of the Eu, but weaker short wavelength emissions can also be detected during low temperature thermoluminescence. There are numerous wavelength dependent differences between the low temperature thermoluminescence curves. These variations are interpreted to show that there are a range of defect and luminescence sites in the Gd2O3:Eu phosphors. These are associated with the symmetry of the crystal field around the europium ion, which is a function of the phase content, i.e. resulting from sample preparation and annealing. The sites are almost independent in terms of their emission spectra, but the stability of some sites is enhanced by the presence of Eu so that the TL peaks appear at higher temperatures than the intrinsic defect TL of the host material. The synthesis of uniform and submicron sized spherical particles with nano-clustered inner structure is demonstrated with various analysis techniques (XRPD, FE-SEM and HR-TEM). The effect of processing parameters and post-annealing treatment is discussed from the viewpoint of different phase formation.

Thermo and photoluminescence properties of Eu3+ activated hexagonal, monoclinic and cubic gadolinium oxide nanorods

“…This glow peak has simple structure and trap distribution which might be used in radiation dosimetry above 60 Gy g-irradiation. Wang et al [40] have studied the TL responses from Eu doped X-rays. They observed six glow peaks at $ 48, 77, 98, 125, 137, 198 and 280 1C, respectively.…”

TEM–STEM study of europium doped gadolinium oxide nanoparticles synthesized by spray pyrolysis

“…Gadolinium or Yttrium doped with Europium oxides are important due to their luminescent properties [15,16]. Higher luminescence efficiency and long-term stability of this material are mostly associated with investigating optimum doping concentration, nanostructuring and obtaining overall morphology control.…”

“…Luminescence studies carried out in Gd 2-O 3 :Eu 3+ phosphor system have demonstrated that annealing and crystalline phases control both the thermoluminescence and radioluminescence signals [15]. Characteristic bands in the emission spectra are assigned to Eu 3+ ion radiative 5 D 0 ?…”

Synthesis of Cerium‐Activated Yttrium Aluminate Based Fine Phosphors by an Aerosol Route

“…[20,21] SP involves extreme synthesis conditions occurring at the level of a micrometer-sized aerosol droplet in a disperse system, thus enabling the synthesis of metastable structures, as previously reported. [21,22] There are certain process parameters, such as high heating and cooling rates, short residence times, and an additional thermal treatment, which may affect the yield of either thermodynamically (YAG, YAM) or kinetically (YAP) stable phases.…”

“…[20,21] SP involves extreme synthesis conditions occurring at the level of a micrometer-sized aerosol droplet in a disperse system, thus enabling the synthesis of metastable structures, as previously reported. [21,22] There are certain process parameters, such as high heating and cooling rates, short residence times, and an additional thermal treatment, which may affect the yield of either thermodynamically (YAG, YAM) or kinetically (YAP) stable phases. [12] The introduction of organic components into the solution is becoming increasingly popular, since these components provide the retention of the proper stoichiometry during the process, and the reaction that occurs in the solution leads to volume precipitation and the formation of dense particles.…”