Thermoluminescence properties of double potassium yttrium fluorides singly doped with Ce3+, Tb3+, Dy3+ and Tm3+ in response to and irradiation

Kui, H. W.; Lo, Dennis; Tsang, Y. C.; Хайдуков, Н. М.; Makhov, V.N.

doi:10.1016/j.jlumin.2005.03.012

Cited by 38 publications

(37 citation statements)

References 16 publications

(16 reference statements)

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“…In that case, the as yet unobserved trapped hole centers might, e.g., be activator-related, as suggested in earlier TL studies on these materials. 2 As, except for Gd 3+ , the RE-related EPR spectra were not monitored in this study Fig. 1.…”

Section: Discussionmentioning

confidence: 92%

“…2, were checked to correspond to the luminescence spectra of the RE activator. 2 The TL response for Ce 3+ doping is known to be lower than for Tb 3+ doping, while at the same time the spectrum is much broader (Ce 3+ (5d→4f) vs.…”

Section: A Epr Spectrum and Thermal Bleachingmentioning

confidence: 98%

“…2,19 Crystals with close to stoichiometric composition are expected to be obtained in this way. This is confirmed by the analysis of the EPR spectra of the RE 3+ dopants and impurities in these crystals, which clearly shows that only one type of Y 3+ sites is available.…”

Section: Crystal Growth and Experimental Setupmentioning

confidence: 99%

“…Quite a few recent papers are devoted to the TL response and the unraveling of its origin. [1][2][3][4][5][6][7] The possibility of using such crystals as scintillators has been explored as well. [8][9][10] In the latter context it has been discovered that for some RE activators the shape of the TL glow curve depends on the type of radiation 2 and pre-sensitisation treatments (irradiation with γ rays), 6 offering possibilities to discriminate mixed radiation fields.…”

Section: Introductionmentioning

confidence: 99%

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Structure ofF2−centers inK2YF5and their relation to thermoluminescence b

et al. 2009

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X-ray irradiation at 77K produces signals from several trapped hole and/or electron centers in the electron paramagnetic resonance (EPR) spectra of rare-earth doped K 2 YF 5 . Five of the spectral components have a structure typical of a center with electron spin S=½ exhibiting a strong hyperfine interaction with two nearly equivalent 19 F nuclei. They are identified as V-or H-type intrinsic trapped hole centers, having the − 2 F molecular anion as their core. Three centers are characterized by monoclinic g and 19 F self hyperfine tensors, i.e. with one principal axis along the crystal's twofold screw axis, the two others are triclinic.Plausible models for these five centers are discussed and via thermal annealing experiments, in which EPR and thermoluminescence (TL) spectra are simultaneously monitored, their role in the TL processes below room temperature is investigated.

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Section: Discussionmentioning

confidence: 92%

Section: A Epr Spectrum and Thermal Bleachingmentioning

confidence: 98%

Section: Crystal Growth and Experimental Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure ofF2−centers inK2YF5and their relation to thermoluminescence b

et al. 2009

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“…Recent reports on thermoluminescence (TL) of rare-earth (RE) activated K 2 YF 5 crystals show that these materials exhibit a strong response to various types of ionizing radiation and hence emerge as promising new materials for highly sensitive TL and/or optically stimulated luminescence (OSL) based radiation detectors [1][2][3][4][5][6][7][8][9][10]. The details of the mechanisms of TL and OSL in these systems are, however, not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

et al. 2011

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Rare-earth related centres have been investigated in K 2 YF 5 :Tb 3+ crystals, exhibiting thermoluminescence (TL) below and above room temperature (RT), using electron paramagnetic resonance (EPR) spectroscopy at Q (34 GHz) and W-band (94 GHz). The spectra have been studied prior to irradiation, after exposure in the kGy range to X-rays at 77 K and subsequent pulse annealing up to 570 K. In addition to Gd 3+ , previously studied in detail, we identified Er 3+ and Yb 3+ centres as accidental impurities in as-grown crystals and determined their effective g tensors. The EPR spectra of irradiated and annealed crystals provide evidence for the production of at least three distinct Tb-related trapped hole centres, two of which could definitely be identified as Tb 4+. Hence, we prove that the Tb 3+ activator ions also act as hole traps in K 2 YF 5 . Pulse annealing experiments indicate that the TL above RT results from thermal release of electrons, recombining at these Tb 4+ ions.

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Optically stimulated luminescence at room temperature of hydrothermal K₂YF₅:Pr³⁺ crystals

Marcazzó

Хайдуков

Caselli

et al. 2009

Physica Status Solidi (a)

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In this paper optically stimulated luminescence (OSL) properties of Pr3+‐doped double potassium yttrium fluoride (K2YF5) under green light stimulation at room temperature as a function of the doping concentration are reported. Besides, some characteristics concerning the possible application of this composition as a new OSL dosimeter are presented, namely, the dose–response and fading of the OSL signal. The residual thermoluminescence (TL) response of K2YF5:Pr3+ after the OSL experiment has been investigated in order to establish whether the traps responsible for OSL are also involved in the TL process. Spectral analysis of the OSL emission has been carried out to determine the role played by Pr3+ ions in the radiative relaxation process. Finally, the total OSL output of K2YF5:Pr3+ is compared to that of commercial Al2O3:C.

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Thermoluminescence properties of double potassium yttrium fluorides singly doped with Ce3+, Tb3+, Dy3+ and Tm3+ in response to and irradiation

Cited by 38 publications

References 16 publications

Structure ofF2−centers inK2YF5and their relation to thermoluminescence b

Structure ofF2−centers inK2YF5and their relation to thermoluminescence b

Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

Optically stimulated luminescence at room temperature of hydrothermal K₂YF₅:Pr³⁺ crystals

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Thermoluminescence properties of double potassium yttrium fluorides singly doped with Ce3+, Tb3+, Dy3+ and Tm3+ in response to and irradiation

Cited by 38 publications

References 16 publications

Structure ofF2−centers inK2YF5and their relation to thermoluminescence b

Structure ofF2−centers inK2YF5and their relation to thermoluminescence b

Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

Optically stimulated luminescence at room temperature of hydrothermal K2YF5:Pr3+ crystals

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Optically stimulated luminescence at room temperature of hydrothermal K₂YF₅:Pr³⁺ crystals