Mixing LiF in Gd2O3:Eu to enhance ultraviolet radiation induced thermoluminescent sensitivity after sintering process

Yeh, Si Jung; Su, Chunyan

doi:10.1016/0921-5107(95)01511-6

Cited by 36 publications

(9 citation statements)

References 4 publications

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“…1), indicate that the emission intensity augmentation observed under X-ray excitation with Li-doping results from the enhanced quantum efficiency of the larger, more crystalline nanocrystals on a per-unit mass basis; earlier literature notes that this effect derives from a combination of reduced surface quenching sites, increased phonon-electron coupling, and diminished internal reflections in more crystalline samples. 17,22–24 …”

Section: Resultsmentioning

confidence: 99%

Europium- and lithium-doped yttrium oxide nanocrystals that provide a linear emissive response with X-ray radiation exposure

et al. 2014

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Eu- and Li-doped yttrium oxide nanocrystals [Y2−xO3; Eux, Liy], in which Eu and Li dopant ion concentrations were systematically varied, were developed and characterized (TEM, XRD, Raman spectroscopic, UV-excited lifetime, and ICP-AES data) in order to define the most emissive compositions under specific X-ray excitation conditions. These optimized [Y2−xO3; Eux, Liy] compositions display scintillation responses that: (i) correlate linearly with incident radiation exposure at X-ray energies spanning from 40–220 kVp, and (ii) manifest no evidence of scintillation intensity saturation at the highest evaluated radiation exposures [up to 4 Roentgen per second]. For the most emissive nanoscale scintillator composition, [Y1.9O3; Eu0.1, Li0.16], excitation energies of 40, 120, and 220 kVp were chosen to probe the dependence of the integrated emission intensity upon X-ray exposure-rate in energy regimes having different mass-attenuation coefficients and where either the photoelectric or the Compton effect governs the scintillation mechanism. These experiments demonstrate for the first time for that for comparable radiation exposures, when the scintillation mechanism is governed by the photoelectric effect and a comparably larger mass-attenuation coefficient (120 kVp excitation), greater integrated emission intensities are recorded relative to excitation energies where the Compton effect regulates scintillation (220 kVp) in nanoscale [Y2−xO3; Eux] crystals. Nanoscale [Y1.9O3; Eu0.1, Li0.16] (70 ± 20 nm) was further exploited as a detector material in a prototype fiber-optic radiation sensor. The scintillation intensity from the [Y1.9O3; Eu0.1, Li0.16]-modified, 400 μm sized optical fiber tip, recorded using a CCD-photodetector and integrated over the 605–617 nm wavelength domain, was correlated with radiation exposure using a Precision XRAD 225Cx small-animal image guided radiation therapy (IGRT) system. For both 80 and 225 kVp energies, this radio transparent device recorded scintillation intensities that tracked linearly with total radiation exposure, highlighting its capability to provide alternately accurate dosimetry measurements for both diagnostic imaging (80 kVp) and radiation therapy treatment (225 kVp).

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Section: Resultsmentioning

confidence: 99%

Europium- and lithium-doped yttrium oxide nanocrystals that provide a linear emissive response with X-ray radiation exposure

et al. 2014

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“…The relatively large radius of RE 3+ and charge mismatching between the RE 3+ and divalent Zn 2+ ions are blamed to the unsuccessful incorporation of RE 3+ into ZnO matrix, hence the inefficient ET is often observed. Lithium and RE 3+ -codoped phosphors exhibit more intense RE 3+ emissions than singly doped RE 3+ samples, resulted from the enhancement of solubility for RE 3+ inserting the host [10] or other mechanisms [11][12][13]. S. Bachir et al reported that the ET between ZnO host and RE 3+ occurred only in the case of Tm 3+ -doped ZnO and explained the ET by a two-step mechanism involving electron-hole recombination via Tm 2+ [4].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of trivalent europium doped ZnO:Zn phosphor under indirect excitation of near-UV light

Chen¹,

Zhang²,

Zhang³

et al. 2008

Opt. Express

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Eu3+, Li+-codoped ZnO:Zn phosphor with intense Eu3+ emissions upon indirect excitation of near-UV light has been synthesized under reducing condition. Steady-state and time-resolved photoluminescence and diffuse reflectance spectra are measured to investigate properties of the luminescence. The results suggest that there exists prominent energy transfer from ZnO host to Eu3+ ions. A series of energy levels as temporary storage of excitation energy play a crucial role on this energy transfer process. Two kinds of Eu3+ sites in Eu3+, Li+-codoped ZnO:Zn are distinguished based on the emission and excitation spectra in comparison with pure Eu2O3.

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“…It is generally accepted that, in bulk phosphor materials, a strong luminescence can be obtained with the presence of co-activators such as Li, even in very small quantities, owing to the facilitated energy transfer from the host to doped rare earth ions. Lithium ion has been introduced into different phosphor host lattices such as Y 2 O 3 :Eu 3+ , Gd 2 O 3 :Eu 3+ , ZnS:Tm 3+ , and ZnO:Dy 3+ [23,26,30,31], acting as a co-activator and charge compensator, and enhanced luminescence has been observed.…”

Section: Resultsmentioning

confidence: 98%

Crystallinity of Li-doped MgO:Dy3+ nanocrystals via combustion process and their photoluminescence properties

Cao

et al. 2008

Journal of Alloys and Compounds

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Mixing LiF in Gd2O3:Eu to enhance ultraviolet radiation induced thermoluminescent sensitivity after sintering process

Cited by 36 publications

References 4 publications

Europium- and lithium-doped yttrium oxide nanocrystals that provide a linear emissive response with X-ray radiation exposure

Europium- and lithium-doped yttrium oxide nanocrystals that provide a linear emissive response with X-ray radiation exposure

Optical properties of trivalent europium doped ZnO:Zn phosphor under indirect excitation of near-UV light

Crystallinity of Li-doped MgO:Dy3+ nanocrystals via combustion process and their photoluminescence properties

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