Theory of heavy charged particle response (efficiency and supralinearity) in TL materials

Horowitz, Y.S.; Ávila, O.; Rodríguez‐Villafuerte, M.

doi:10.1016/s0168-583x(01)00710-8

Cited by 165 publications

(83 citation statements)

References 60 publications

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“…In the present study UV exposure is used for creation of defects, and the observed TL glow peaks is mainly attributed to surface defects, since UV radiation cannot penetrate deep into the material (Chandrasekhar et al, 2012). The sublinear increase in TL intensity with UV exposure can be explained on the basis of Horowitz's TIM (track interaction model) (Horowitz et al, 1995;Horowitz et al, 2001). At low exposure time the recombination of various trapping/luminescent centres (TCs/LCs) occurs entirely within the tracks.…”

Section: Resultsmentioning

confidence: 86%

Photoluminescece and Thermoluminescence Behavior of Zn2SiO4: Mn2+, Eu2+ Phosphor

Dubey¹,

Tiwari²,

Pradhan³

et al. 2014

JLA

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The present paper reports the synthesis, photoluminescence and thermoluminescence (TL) studies of Mn 2+ and Eu 2+ doped Zn2SiO4. The sample was prepared by the modified solid state reaction method, which is the most suitable for large-scale production. The prepared phosphor sample was characterized using Powder XRay Diffraction (PXRD), Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared Spectroscopy (FTIR), photoluminescence (PL) and Thermoluminescence (TL) techniques. The PL emission was observed in the range 400-650 nm ranges green regions for the Mn 2+ and Eu 2+ doped Zn2SiO4. Excitation spectrum found at 267, 278 and 314nm. Sharp intense peaks found around 490, 544 and 552nm with high intensity. From the XRD data, using the Scherer's formula, the calculated average crystallite size of phosphor is around few microns. Thermoluminescence study was carried out for the phosphor with UV irradiation with linear heating rate 6.7 0 C s -1 . The kinetic parameters are calculated by (Computerized glow curve convolution technique) CGCD technique.

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Section: Resultsmentioning

confidence: 86%

Photoluminescece and Thermoluminescence Behavior of Zn2SiO4: Mn2+, Eu2+ Phosphor

Dubey¹,

Tiwari²,

Pradhan³

et al. 2014

JLA

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“…As the dose increases, the TL intensity increases as still some nanoparticles exist that would have missed while being targeted by the high energy irradiation, owing to the small size of the particles. This gives good linearity over a wide range of dose [35]. The glow curve is related to the trap levels that lie at different depths in the band gap between the conduction and valence bands of a solid.…”

Section: Thermoluminescence (Tl)mentioning

confidence: 90%

Structural, EPR, photo and thermoluminescence properties of ZnO:Fe nanoparticles

Reddy

Kokila

Nagabhushana

et al. 2012

Materials Chemistry and Physics

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a b s t r a c tZn (1−x) Fe (x) O (1+0.5x) (x = 0.5-5 mol%) nanoparticles were synthesized by a low temperature solution combustion route. The structural characterization of these nanoparticles by PXRD, SEM and TEM confirmed the phase purity of the samples and indicated a reduction in the particle size with increase in Fe content. A small increase in micro strain in the Fe doped nanocrystals is observed from W-H plots. EPR spectrum exhibits an intense resonance signal with effective g values at g ≈ 2.0 with a sextet hyperfine structure (hfs) besides a weak signal at g ≈ 4.13. The signal at g ≈ 2.0 with a sextet hyperfine structure might be due to manganese impurity where as the resonance signal at g ≈ 4.13 is due to iron. The optical band gap E g was found to decrease with increase of Fe content. Raman spectra exhibit two non-polar optical phonon (E 2 ) modes at low and high frequencies at 100 and 435 cm −1 in Fe doped samples. These modes broaden and disappear with increase of Fe dopant concentration. TL measurements of ␥-irradiated (1-5 kGy) samples show a main glow peak at 368• C at a warming rate of 6.7• Cs −1 . The thermal activation parameters were estimated from Glow peak shape method. The average activation energy was found to be in the range 0.34-2.81 eV.

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“…It is observed that, the TL intensity increases with γ-ray dose up to 6 kGy and then it decreases with further increase in dose (8-10kGy) (Fig.10). This increase in intensity can be explained on the basis of track interaction model (TIM) [30,31]. This model suggests that the number of generated traps as a result of irradiation depends on both the cross section of the tracks and the length of the tracks in the matrix.…”

Section: Electron Paramagnetic Resonance (Epr) Studiesmentioning

confidence: 99%

Luminescence studies and EPR investigation of solution combustion derived Eu doped ZnO

Reddy

Kokila

Nagabhushana

et al. 2014

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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ZnO:Eu (0.1 mol%) nanopowders have been synthesized by auto ignition based low temperature solution combustion method. Powder X-ray diffraction (PXRD) patterns confirm the nano sized particles which exhibit hexagonal wurtzite structure. The crystallite size estimated from Scherrer's formula was found to be in the range ~ 35-39 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) studies reveal particles are agglomerated with quasi-hexagonal morphology. A blue shift of absorption edge with increase in band gap is observed for Eu doped ZnO samples.Upon 254 nm excitation, ZnO:Eunanopowders show peaks in regions blue (420-484 nm), green (528 nm) and red (600 nm) which corresponds to both Eu 2+ and Eu 3+ ions. The Electron paramagnetic resonance (EPR) spectrum exhibits a broad resonance signal at g = 4.195 which is attributed to Eu 2+ ions. Further, EPR and thermoluminescence (TL) studies reveal presence of native defects in this phosphor. Using TL glow peaks the trap parameters have been evaluated and discussed.

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Theory of heavy charged particle response (efficiency and supralinearity) in TL materials

Cited by 165 publications

References 60 publications

Photoluminescece and Thermoluminescence Behavior of Zn2SiO4: Mn2+, Eu2+ Phosphor

Photoluminescece and Thermoluminescence Behavior of Zn2SiO4: Mn2+, Eu2+ Phosphor

Structural, EPR, photo and thermoluminescence properties of ZnO:Fe nanoparticles

Luminescence studies and EPR investigation of solution combustion derived Eu doped ZnO

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