Scintillation of rare earth doped fluoride nanoparticles

Abstract

The scintillation response of rare earth (RE) doped core/undoped (multi-)shell fluoride nanoparticles was investigated under x-ray and alpha particle irradiation. A significant enhancement of the scintillation response was observed with increasing shells due: (i) to the passivation of surface quenching defects together with the activation of the REs on the surface of the core nanoparticle after the growth of a shell, and (ii) to the increase of the volume of the nanoparticles. These results are expected to reflect a general aspect of the scintillation process in nanoparticles, and to impact radiation sensing technologies that make use of nanoparticles.

PEGylated β-NaGdF4/Tb@CaF2 Core/Shell Nanophosphors for Enhanced Radioluminescence and Folate Receptor Targeting

“…Moreover, the presence of heterostructured CaF 2 and the distinct oxide state between the Gd 3+ , Tb 3+, and Ca 2+ resulted in the largely diminished interfacial diffusion and leakage of the lanthanide ions, which are beneficial for the radioluminescence enhancement and long-term photostability . In addition to the surface passivation arising from the CaF 2 shell encapsulation, the local asymmetry resulted by the cation exchange between Ca 2+ and Na + could promote the transition of luminescent ions and the enlarged nanoparticle size was found to increase the radiative recombination rate of e–h pairs. , …”

“…37 In addition to the surface passivation arising from the CaF 2 shell encapsulation, the local asymmetry resulted by the cation exchange between Ca 2+ and Na + could promote the transition of luminescent ions and the enlarged nanoparticle size was found to increase the radiative recombination rate of e−h pairs. 37,53 X-ray Excited Imaging. To compare the performance of these two types of nanoparticles for X-ray luminescence imaging, we imaged various dilutions with Gd 3+ concentration ranging from 0.5 to 10 mg/mL.…”

Advanced Materials for Radiation Dosimetry

“…Nanoparticle composites also have the advantage that they can be pressed into arbitrary shapes. Recently, fluoride nanoparticles have been researched for optical amplifiers [22,99], but reports of the dosimeter properties of these nanoparticles is very limited [23,24,36]. In this chapter, the results of the concentration of the dopant on the PL spectra, PL lifetime and RL measurements of fluoride nanoparticles will be discussed.…”

“…Furthermore, large area detectors can be produced to "image" the radiation field [27]. OSL dosimeters can also be combined with radioluminescence dosimeters (RLD) [23,24,36]. The bulk materials which are observed in this thesis show OSL [3] and RL [10,11,12].…”

“…Fluoroperovskite-based compounds have recently attracted interest because of the range of potential applications including optical amplifiers [21,22] and radiation detectors [23,24].…”