Charge transfer processes in CsI:Tl using near-UV light

Yakovlev, V. Yu.; Trefilova, L.; Meleshko, A.; Alekseev, V.; Kosinov, N. N.

doi:10.1016/j.jlumin.2014.05.019

Cited by 9 publications

(8 citation statements)

References 16 publications

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“…This is supported by the presence of similar bands in the excitation spectrum of Yb 2+ within the exciton excitation region. Similar energy transfer mechanisms have been observed in other effective halide scintillators, such as CsI-Tl [69] and CsI-Eu [3], BaBrI-Eu [19], BaBrI-Ce [70], and BaBrCl-Eu [71].…”

Section: Discussionsupporting

confidence: 75%

“…Scintillators based on CsI have been known for quite a long time [1]. The most popular impurities for doping CsI crystals are Tl [2,3], Na [4,5], and Eu 2+ [6][7][8]. The radiation defects in Tl-doped scintillators were studied in [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…With increasing temperature, the decay of exciton excitations begins to occur non-radiatively, so CsI is doped with various impurities. The most studied process is the transfer of excitations to Tl + luminescence centers [3,10,28,29]. Promising impurities for halide scintillators are divalent lanthanides, in particular, CsI-Eu 2+ .…”

Section: Introductionmentioning

confidence: 99%

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Crystal Growth and Spectroscopy of Yb2+-Doped CsI Single Crystal

Sofich,

Myasnikova,

Bogdanov

et al. 2024

Crystals

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The single crystals of CsI-Yb2+ were grown, and their spectroscopic studies were conducted. The observed luminescence in CsI-Yb2+ is due to 5d–4f transitions in Yb2+ ions. Using time-resolved spectroscopy, spin-allowed and spin-forbidden radiative transitions of ytterbium ions at room temperature were found. The excitation spectra of Yb2+ luminescence bands were obtained in the range of 3–45 eV. The mechanism of charge compensation of Yb2+ ions in a CsI crystal was also studied, the spectrum of the thermally stimulated depolarization current was measured, and the activation energies of the two observed peaks were calculated. These peaks belong to impurity–vacancy complexes in two different positions. The charge compensation of Yb2+ occurs via cation vacancies in the nearest-neighbor and next-nearest-neighbor positions.The Yb2+ ions are promising dopants for CsI scintillators and X-ray phosphors in combination with SiPM photodetectors.

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Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Crystal Growth and Spectroscopy of Yb2+-Doped CsI Single Crystal

Sofich,

Myasnikova,

Bogdanov

et al. 2024

Crystals

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“…For these calculations we adopt the conventional assumption that it is the electron that is untrapping from Tl 0 . An alternative suggestion that Tl 0 is a deep electron trap [26][27][28] and instead holes untrap thermally from Tl ++ to recombine with the static Tl 0 has been made [26].…”

Section: A Experimental Datamentioning

confidence: 99%

Energy-Dependent Scintillation Pulse Shape and Proportionality of Decay Components for CsI:Tl: Modeling with Transport and Rate Equations

Gridin

Williams

et al. 2017

Phys. Rev. Applied

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Relatively recent experiments on the scintillation response of CsI:Tl have found that there are three main decay times of about 730 ns, 3 µs, and 16 µs, i.e. one more principal decay component than had been previously reported; that the pulse shape depends on gamma ray energy; and that the proportionality curves of each decay component are different, with the energy dependent light yield of the 16 µs component appearing to be anticorrelated with that of the 0.73 µs component at room temperature. These observations can be explained by the described model of carrier transport and recombination in a particle track. It takes into account processes of hot and thermalized carrier diffusion, electric field transport, trapping, nonlinear quenching, and radiative recombination. With one parameter set, the model reproduces multiple observables of CsI:Tl scintillation response, including the pulse shape with rise and three decay components, its energy dependence, the approximate proportionality, and the main trends in proportionality of different decay components. The model offers insights on the spatial and temporal distributions of carriers and their reactions in the track. I.

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“…The luminescence mechanism of CsI(Tl) is relatively mature, some works have proposed some forms of the lightemitting structure of CsI:Tl, but the way to verify the conclusion is different [4][5][6]. Therefore, we chose CsI(Tl) as the sample for the study, hoping to verify the feasibility of our research method.…”

Section: Introductionmentioning

confidence: 99%

The investigation of the luminescent structure of thallium-doped cesium iodide (CsI:Tl) basing on the first-principles coupled with spectral analysis

Gao

Wang

et al. 2022

J. Phys.: Condens. Matter

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The luminescent structure of thallium-doped Cesium iodide (CsI:Tl) and the behavior of electrons during luminescence are studied at great length based on the conventional first-principles calculation combined with ordinary spectroscopic analysis befittingly in this work. The Hybrid functionals based on a screened Coulomb potential (HSE) algorithm is used to visualize the energy band structure of the experimental sample’s system, and the corresponding relationship between the transition behavior of CsI:Tl energy levels and the spectrum is studied more accurately. We show the complete energy conversion process clearly, which involves the crystal beginning to receive the energy of a photon until the moment of de-excitation. All the fluorescence process is completed by Tl+ ions that replace Cs+ ions. Our results verify and complement the previous theories and potentially provide important references for the adjustment and design of the detectors and imaging equipment in different fields.

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Charge transfer processes in CsI:Tl using near-UV light

Cited by 9 publications

References 16 publications

Crystal Growth and Spectroscopy of Yb2+-Doped CsI Single Crystal

Crystal Growth and Spectroscopy of Yb2+-Doped CsI Single Crystal

Energy-Dependent Scintillation Pulse Shape and Proportionality of Decay Components for CsI:Tl: Modeling with Transport and Rate Equations

The investigation of the luminescent structure of thallium-doped cesium iodide (CsI:Tl) basing on the first-principles coupled with spectral analysis

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