Time-resolved A<sub>x</sub>-luminescence of Nal: TI under electron pulse irradiation

Abstract

This paper studies spectral-kinetic properties of Nal:TI cathodoluminescence registered in the region of A_x-band with maximum 425 nm within the time interval of 10^-8-10^-2 s. A_x-luminescence of Nal:TI crystal has been excited with an electron pulse (Ee = 0.25 MeV, t_1/2 = 10 ns, W = 0.003...0.16 J/cm²) at temperatures in the range of 65-300 K. It has been found that the cathodoluminescence kinetics of Nal:TI crystal at 425 nm has beside the exponential decay (τ = 235 ns at T = 295 K) also three more components: the fastest exponential decay (τ = 12 ns at T = 78 K), post-irradiation rise on a submicrosecond time scale at T ≥ 128 K and slow exponential decay at T ≥ 160 K. A model has been suggested according to which Aj.-luminescence at 425 nm is caused by ¹P₁ ¹S₀ electron transition of Tl⁺ ion. It has been explained that the fast decay and post-irradiated rise components are caused by ³P₁ ¹P₁ and ³P₀ ³P₁ electron transitions of Tl⁺ ion, respectively. The scintillation process in Nal:TI has been discussed.

Original language	English
Pages (from-to)	540-545
Number of pages	6
Journal	Functional Materials
Volume	23
Issue number	4
DOIs	https://doi.org/10.15407/fm23.04.364
Publication status	Published - 2016

Keywords

Energy transfer
Intra-center transitions
Thallium-doped sodium iodide
Time-resolved cathodoluminescence

ASJC Scopus subject areas

Materials Science(all)

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10.15407/fm23.04.364

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@article{748f413918704c5eb55717ca2c0e19f6,

title = "Time-resolved Ax-luminescence of Nal: TI under electron pulse irradiation",

abstract = "This paper studies spectral-kinetic properties of Nal:TI cathodoluminescence registered in the region of Ax-band with maximum 425 nm within the time interval of 10-8-10-2 s. Ax-luminescence of Nal:TI crystal has been excited with an electron pulse (Ee = 0.25 MeV, t1/2 = 10 ns, W = 0.003...0.16 J/cm2) at temperatures in the range of 65-300 K. It has been found that the cathodoluminescence kinetics of Nal:TI crystal at 425 nm has beside the exponential decay (τ = 235 ns at T = 295 K) also three more components: the fastest exponential decay (τ = 12 ns at T = 78 K), post-irradiation rise on a submicrosecond time scale at T ≥ 128 K and slow exponential decay at T ≥ 160 K. A model has been suggested according to which Aj.-luminescence at 425 nm is caused by 1P1 1S0 electron transition of Tl+ ion. It has been explained that the fast decay and post-irradiated rise components are caused by 3P1 1P1 and 3P0 3P1 electron transitions of Tl+ ion, respectively. The scintillation process in Nal:TI has been discussed.",

keywords = "Energy transfer, Intra-center transitions, Thallium-doped sodium iodide, Time-resolved cathodoluminescence",

author = "V. Yakovlev and L. Trefilova and V. Alekseev and V. Krasnov",

year = "2016",

doi = "10.15407/fm23.04.364",

language = "English",

volume = "23",

pages = "540--545",

journal = "Functional Materials",

issn = "1027-5495",

publisher = "National Academy of Sciences of Ukraine",

number = "4",

}

TY - JOUR

T1 - Time-resolved Ax-luminescence of Nal

T2 - TI under electron pulse irradiation

AU - Yakovlev, V.

AU - Trefilova, L.

AU - Alekseev, V.

AU - Krasnov, V.

PY - 2016

Y1 - 2016

N2 - This paper studies spectral-kinetic properties of Nal:TI cathodoluminescence registered in the region of Ax-band with maximum 425 nm within the time interval of 10-8-10-2 s. Ax-luminescence of Nal:TI crystal has been excited with an electron pulse (Ee = 0.25 MeV, t1/2 = 10 ns, W = 0.003...0.16 J/cm2) at temperatures in the range of 65-300 K. It has been found that the cathodoluminescence kinetics of Nal:TI crystal at 425 nm has beside the exponential decay (τ = 235 ns at T = 295 K) also three more components: the fastest exponential decay (τ = 12 ns at T = 78 K), post-irradiation rise on a submicrosecond time scale at T ≥ 128 K and slow exponential decay at T ≥ 160 K. A model has been suggested according to which Aj.-luminescence at 425 nm is caused by 1P1 1S0 electron transition of Tl+ ion. It has been explained that the fast decay and post-irradiated rise components are caused by 3P1 1P1 and 3P0 3P1 electron transitions of Tl+ ion, respectively. The scintillation process in Nal:TI has been discussed.

AB - This paper studies spectral-kinetic properties of Nal:TI cathodoluminescence registered in the region of Ax-band with maximum 425 nm within the time interval of 10-8-10-2 s. Ax-luminescence of Nal:TI crystal has been excited with an electron pulse (Ee = 0.25 MeV, t1/2 = 10 ns, W = 0.003...0.16 J/cm2) at temperatures in the range of 65-300 K. It has been found that the cathodoluminescence kinetics of Nal:TI crystal at 425 nm has beside the exponential decay (τ = 235 ns at T = 295 K) also three more components: the fastest exponential decay (τ = 12 ns at T = 78 K), post-irradiation rise on a submicrosecond time scale at T ≥ 128 K and slow exponential decay at T ≥ 160 K. A model has been suggested according to which Aj.-luminescence at 425 nm is caused by 1P1 1S0 electron transition of Tl+ ion. It has been explained that the fast decay and post-irradiated rise components are caused by 3P1 1P1 and 3P0 3P1 electron transitions of Tl+ ion, respectively. The scintillation process in Nal:TI has been discussed.

KW - Energy transfer

KW - Intra-center transitions

KW - Thallium-doped sodium iodide

KW - Time-resolved cathodoluminescence

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