Photoluminescence of F-aggregate centers in thermal neutron irradiated LiF TLD-100 single crystals

Lakshmanan, A.; Madhusoodanan, U.; Natarajan, A.; Panigrahi, B. K.

doi:10.1002/pssa.2211530127

Cited by 33 publications

(32 citation statements)

References 17 publications

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“…The sensitivity of LiF to ionizing radiation is used in dosimetry [5]. In [6], it is shown that color centers on the surface of LiF can considerably increase the adhesion strength of silver and gold films on this surface.…”

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confidence: 99%

Radiation-induced color centers in the near-surface layer of lithium fluoride crystals

et al. 2006

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For radiation-induced intrinsic color centers, we show that the concentrations of identical centers and the concentration ratios of different centers are quite different in the near-surface layer and within the interior volume of a lithium fluoride crystal. We have established that these differences also depend on the sign of the difference between the temperature at which the crystal was irradiated with γ photons and the vacancy mobility temperature. We provide an interpretation for the results obtained, based on the structural features of the near-surface layer and the concentration ratio of vacancies and electrons in the layer, serving as the starting components for color center formation. We found that the concentrations of centers change over the course of a few days by tens of percent in the layer "emerging" from the interior onto the surface as a result of cleavage of the crystal. We measured the luminescence lifetimes of F 3 (R2) and F 4 centers: 6.6 nsec and 11.7 nsec.

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confidence: 99%

Radiation-induced color centers in the near-surface layer of lithium fluoride crystals

et al. 2006

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“…(11), (13), (14) and on further consideration, we assumed the absence of electrons in traps. However, this assumption does not affect the conclusion concerning the relative efficiency of reactions (2) and (4). Below we will find that the presence of electrons in traps is not supported by the experimental results.…”

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confidence: 89%

“…Note that the concentration of F 1 centers and interstitial fluorine atoms are close in value, and much higher than the concentration of interstitial fluoride ions. Therefore the probabilities of processes (8) and (4) are much higher than the probability of process (2). The values found for the activation energies and lifetimes of vacancies and F 2 + centers will be used in analysis of the processes forming F 2 and F 3 + color centers.…”

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Aggregate color center formation processes in lithium fluoride crystals after irradiation

et al. 2011

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Lithium fluoride crystals were irradiated by different doses of gamma photons at a temperature of 77 K. We measured the aggregation kinetics for the color centers with different annealing temperatures above the temperature of anion vacancy mobility. We show that the lifetimes of the vacancies decrease while the lifetimes of the F 2 + centers increase as the irradiation dose increases. We explain these types of dependences based on the aggregation processes for color centers in the post-radiation period. We determine the time constants and energies (analogous to activation energies in the Arrhenius equation) for the various processes involving rise and fall in the concentration of aggregate color centers. Based on the experimental data obtained, we have established the processes forming F 2 and F 3 + centers in the post-radiation period. The F 2 centers are formed when vacancies v a add to F 1 − centers. Vacancies arising during irradiation of the crystal participate in their creation in the first fast stage. In the long final stage, vacancies are used which appear in the post-radiation period on occurrence of the reaction F 2 + + H → v a + fluoride ion at the lattice site, where H is an interstitial fluorine atom. The F 3 + centers are formed both by merging F 2 + and F 1 centers and as a result of addition of vacancies to F 2 centers. In this case, vacancies are used that are generated not only during irradiation of the crystal but also in the post-radiation period. The rise in the concentration of F 3 + centers occurs faster than the rise in the concentration of F 2 centers.Introduction. Lithium fluoride crystals (LiF) with radiation-induced color centers are widely used and studied. These crystals, pure [1] and with impurities [2], are well known materials for ionizing radiation dosimetry. Lithium fluoride with color centers is used as an active medium with broadband gain in solid-state lasers in the visible and near-IR ranges of the spectrum [3]. The problems of miniaturization of components based on it and design of structures with high spatial resolution [4][5][6][7] have been studied. New detectors have been proposed in the form of microcrystalline lithium fluoride in a polymer matrix for determining high doses of gamma photons and electrons [8], and also polycrystalline LiF films as neutron sensors [9]. Polycrystalline lithium fluoride (LiF ceramic) has been created [10] and the possibilities for its use have been intensively studied. Applications of lithium fluoride with color centers require targeted variation and optimization of its properties and characteristics. In order to solve these problems, we need to know as much detail as possible about the color center formation processes.Processes involved in formation of radiation-induced color centers in lithium fluoride have been studied for many years [11][12][13][14][15][16]. It has been found that the kinetics and results of coloring LiF depend on a number of factors: the type of ionizing radiation, the irradiation dose and irradiation conditions, the ...

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“…For instance, colour centres (CC's) [3] in lithium fluoride (LiF) are well known for their application in tuneable solid-state lasers [4], dosimeters [5], and miniaturized light-emitting devices [6]. Certain types of CC's in LiF are optically active, stable at room temperature, and possess broad absorption and emission bands in the visible [7].…”

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confidence: 99%

Broadband X-ray edge-enhancement imaging of a boron fibre on lithium fluoride thin film detector

Nichelatti

Bonfigli

Vincenti

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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Photoluminescence of F-aggregate centers in thermal neutron irradiated LiF TLD-100 single crystals

Cited by 33 publications

References 17 publications

Radiation-induced color centers in the near-surface layer of lithium fluoride crystals

Radiation-induced color centers in the near-surface layer of lithium fluoride crystals

Aggregate color center formation processes in lithium fluoride crystals after irradiation

Broadband X-ray edge-enhancement imaging of a boron fibre on lithium fluoride thin film detector

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