Intracenter processes induced by electron beam and 337 nm laser light in CsI:Tl
| Parent link: | Functional Materials Vol. 26, № 3.— 2019.— [P. 454-461] |
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| Awdur Corfforaethol: | |
| Awduron Eraill: | , , , , , , |
| Crynodeb: | Title screen Investigated are the spectral-kinetic properties of the activator luminescence excited in CsI:Tl crystal by a pulsed electron beam and by a pulsed nitrogen laser at λ = 337.1 nm, that corresponds to the long-wave decline of the A-absorption band. It is found that the decay kinetics of 2.6 and 2.25 eV luminescence bands excited by an electron beam at 80 K is mono-exponential with the time constants τ = 4 μs and τ = 13 μs, respectively. The decay kinetics of each from the luminescence bands under the laser excitation is bi-exponential due to the presence of one more component with time constant τ = 900 ns. This sub-microsecond component dominates in the bi-exponential kinetics, and the value of its time constant is determined by the time of the electron transfer from the metastable ψ sub-level of the excited 62P3/2 state to the ground 62P1/2 state of Tl0 center. Phonon-assisted processes causing population of the radiative states of Tl+ centers responsible for 3.0, 2.25 and 2.6 eV luminescence bands are discussed in detail. |
| Cyhoeddwyd: |
2019
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| Pynciau: | |
| Mynediad Ar-lein: | https://doi.org/10.15407/fm26.03.454 |
| Fformat: | Electronig Pennod Llyfr |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=661191 |
| Crynodeb: | Title screen Investigated are the spectral-kinetic properties of the activator luminescence excited in CsI:Tl crystal by a pulsed electron beam and by a pulsed nitrogen laser at λ = 337.1 nm, that corresponds to the long-wave decline of the A-absorption band. It is found that the decay kinetics of 2.6 and 2.25 eV luminescence bands excited by an electron beam at 80 K is mono-exponential with the time constants τ = 4 μs and τ = 13 μs, respectively. The decay kinetics of each from the luminescence bands under the laser excitation is bi-exponential due to the presence of one more component with time constant τ = 900 ns. This sub-microsecond component dominates in the bi-exponential kinetics, and the value of its time constant is determined by the time of the electron transfer from the metastable ψ sub-level of the excited 62P3/2 state to the ground 62P1/2 state of Tl0 center. Phonon-assisted processes causing population of the radiative states of Tl+ centers responsible for 3.0, 2.25 and 2.6 eV luminescence bands are discussed in detail. |
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| DOI: | 10.15407/fm26.03.454 |