Recombination luminescence of LaPO4-Eu and LaPO4-Pr nanoparticles

Malyy, T.; Vistovskyy, V.; Khapko, Z. A.; Pushak, A.S.; Mitina, Nataliya; Zaichenko, Alexander; Gektin, A.; Voloshinovskii, А.

doi:10.1063/1.4808797

Cited by 35 publications

(25 citation statements)

References 23 publications

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“…Synthesis techniques and post-synthesis processing affect the size, crystallinity, and dopant distribution of nanostructures. The role of post-synthesis annealing on NCs was recently investigated with LaPO 4 :Eu and LaPO 4 :Pr (Malyy et al, 2013 ), as well as LuPO 4 :Ce (Vistovskyy et al, 2014 ). In the case of LaPO 4 :Ln, annealing was used to increase the size of the NCs, also resulting in a change of lattice symmetry above ~500°C.…”

Section: Scintillating Nanoparticles For Radiation/photodynamic “Hybrmentioning

confidence: 99%

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Gold nanoparticles and their alternatives for radiation therapy enhancement

2014

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Radiation therapy is one of the most commonly used treatments for cancer. The dose of delivered ionizing radiation can be amplified by the presence of high-Z materials via an enhancement of the photoelectric effect; the most widely studied material is gold (atomic number 79). However, a large amount is needed to obtain a significant dose enhancement, presenting a challenge for delivery. In order to make this technique of broader applicability, the gold must be targeted, or alternative formulations developed that do not rely solely on the photoelectric effect. One possible approach is to excite scintillating nanoparticles with ionizing radiation, and then exploit energy transfer between these particles and attached dyes in a manner analogous to photodynamic therapy (PDT). Doped rare-earth halides and semiconductor quantum dots have been investigated for this purpose. However, although the spectrum of emitted light after radiation excitation is usually similar to that seen with light excitation, the yield is not. Measurement of scintillation yields is challenging, and in many cases has been done only for bulk materials, with little understanding of how the principles translate to the nanoscale. Another alternative is to use local heating using gold or iron, followed by application of ionizing radiation. Hyperthermia pre-sensitizes the tumors, leading to an improved response. Another approach is to use chemotherapeutic drugs that can radiosensitize tumors. Drugs may be attached to high-Z nanoparticles or encapsulated. This article discusses each of these techniques, giving an overview of the current state of nanoparticle-assisted radiation therapy and future directions.

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Section: Scintillating Nanoparticles For Radiation/photodynamic “Hybrmentioning

confidence: 99%

“…(2) Energy exchange due to inelastic scattering on valence band electrons, and (3) relaxation of primary electrons. (Reprinted with permission from Malyy et al, 2013 ).…”

Section: Scintillating Nanoparticles For Radiation/photodynamic “Hybrmentioning

confidence: 99%

Gold nanoparticles and their alternatives for radiation therapy enhancement

2014

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“…Phosphor's luminescent properties depend on the characteristics of the optically active ion and its local environment provided by the host lattice. In recent years, the lanthanum orthophosphate (LaPO 4 ), non-toxic, biocompatible, thermally, chemically, and photo-stable material has been recognized Materials 2020, 13, 3071 2 of 10 as an excellent choice for rare-earth ion doping [8][9][10][11][12]. Due to the similar ionic radii and charge, lanthanum ion (La 3+ ) can be easily replaced with different rare-earth (RE 3+ ) ions (e.g., Eu 3+ , Dy 3+ , Sm 3+ ) at a wide range of concentrations without significantly affecting the lattice structure [13].…”

Section: Introductionmentioning

confidence: 99%

Surface Plasmon Enhancement of Eu3+ Emission Intensity in LaPO4/Ag Nanoparticles

et al. 2020

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A promising way to improve the performance of luminescent materials is to combine them with noble metal nanoparticles. Herein, a set of silver/europium-doped lanthanum orthophosphate (Ag/La0.95Eu0.05PO4) nanostructures with different concentrations of silver nanoparticles were prepared and investigated. The presented overlap between the strongest europium (Eu3+) excitation line and the broad silver nanoparticle surface plasmon resonance makes the combination prospective for coupling. X-ray powder diffraction confirmed the monoclinic monazite structure. The transmission electron microscopy revealed particles with a rod-like shape and ~4 aspect ratio. Photoluminescence spectra show characteristic Eu3+ ion red emission. One of the requirements for an enhanced luminescence effect is the precise control of the distance between the noble metal nanoparticles and the emitter ion. The distance is indirectly varied throughout the change of Ag nanoparticle concentration in the La0.95Eu0.05PO4 host. The emission intensity increases with the increase in Ag nanoparticles up to 0.6 mol %, after which the luminescence decreases due to the nanoparticles’ close packing and aggregation leading to the displacement of La0.95Eu0.05PO4 from the vicinity of the metal particles and reabsorption of the emitted light. The emission intensity of La0.95Eu0.05PO4 increases more than three times when the Eu3+ excitation is supported by the localized surface plasmon resonance in the Ag/La0.95Eu0.05PO4 nanostructures.

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“…The dependences of recombinational luminescence intensity on nanoparticle size considering a ratio between nanoparticle size and thermalization length of charge carriers were studied for CaF 2 and LaPO 4 -Eu, LaPO 4 -Pr nanoparticles. 3,4 An assumption about the influence of the mentioned ratio on intensity of a recombinational luminescence is considered also in Refs. 1 and 5.…”

Section: Introductionmentioning

confidence: 99%

Self-trapped exciton and core-valence luminescence in BaF2 nanoparticles

Vistovskyy

Zhyshkovych

Chornodolskyy

et al. 2013

Journal of Applied Physics

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The influence of the BaF 2 nanoparticle size on the intensity of the self-trapped exciton luminescence and the radiative core-valence transitions is studied by the luminescence spectroscopy methods using synchrotron radiation. The decrease of the self-trapped exciton emission intensity at energies of exciting photons in the range of optical exciton creation (h E g ) is less sensitive to the reduction of the nanoparticle sizes than in the case of band-to-band excitation, where excitons are formed by the recombination way. The intensity of the core-valence luminescence shows considerably weaker dependence on the nanoparticle sizes in comparison with the intensity of self-trapped exciton luminescence. The revealed regularities are explained by considering the relationship between nanoparticle size and photoelectron or photohole thermalization length as well as the size of electronic excitations. V C 2013 AIP Publishing LLC. [http://dx.

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Recombination luminescence of LaPO4-Eu and LaPO4-Pr nanoparticles

Cited by 35 publications

References 23 publications

Gold nanoparticles and their alternatives for radiation therapy enhancement

Gold nanoparticles and their alternatives for radiation therapy enhancement

Surface Plasmon Enhancement of Eu3+ Emission Intensity in LaPO4/Ag Nanoparticles

Self-trapped exciton and core-valence luminescence in BaF2 nanoparticles

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