Short-living absorption and emission of CsI(Na)

Abstract

This paper investigates the short-living absorption and the emission of CsI(Na) under a pulsed electron beam (_e=0.25 MeV, t_1/2=15 ns and W=0.003...0.16 J/cm²). The bands of singlet self-trapped excitons, as well as Na⁰ and V_k color centers have been detected in the transient absorption spectrum of CsI(Na). It has been found that the activator luminescence spectrum, peaking at 3.0 eV, fits a Gaussian (E _m=3.0 eV and FWHM=0.44±0.02 eV at 80 K) and remains the same at different time delays within 10^-810^-3 s. The decay kinetics of the 3.0 eV emission has one nanosecond exponential component and two microsecond ones with time constants 1.0 and 3.0 μs, which remain unchanged within 78150 K. It is concluded that the activator emission is due to the radiative annihilation of sodium-perturbed two halide excitons from the non-relaxed singlet state. The pathways of such excitons creation are discussed.

Original language	English
Pages (from-to)	2579-2581
Number of pages	3
Journal	Journal of Luminescence
Volume	131
Issue number	12
DOIs	https://doi.org/10.1016/j.jlumin.2011.06.037
Publication status	Published - 1 Dec 2011

Keywords

Cathode luminescence
Color center
Short-living absorption
Sodium-doped cesium iodide

ASJC Scopus subject areas

Biophysics
Atomic and Molecular Physics, and Optics
Chemistry(all)
Biochemistry
Condensed Matter Physics

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10.1016/j.jlumin.2011.06.037

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title = "Short-living absorption and emission of CsI(Na)",

abstract = "This paper investigates the short-living absorption and the emission of CsI(Na) under a pulsed electron beam (e=0.25 MeV, t1/2=15 ns and W=0.003...0.16 J/cm2). The bands of singlet self-trapped excitons, as well as Na0 and Vk color centers have been detected in the transient absorption spectrum of CsI(Na). It has been found that the activator luminescence spectrum, peaking at 3.0 eV, fits a Gaussian (E m=3.0 eV and FWHM=0.44±0.02 eV at 80 K) and remains the same at different time delays within 10-810-3 s. The decay kinetics of the 3.0 eV emission has one nanosecond exponential component and two microsecond ones with time constants 1.0 and 3.0 μs, which remain unchanged within 78150 K. It is concluded that the activator emission is due to the radiative annihilation of sodium-perturbed two halide excitons from the non-relaxed singlet state. The pathways of such excitons creation are discussed.",

keywords = "Cathode luminescence, Color center, Short-living absorption, Sodium-doped cesium iodide",

author = "V. Yakovlev and L. Trefilova and A. Meleshko and Yu Ganja",

year = "2011",

month = dec,

day = "1",

doi = "10.1016/j.jlumin.2011.06.037",

language = "English",

volume = "131",

pages = "2579--2581",

journal = "Journal of Luminescence",

issn = "0022-2313",

publisher = "Elsevier",

number = "12",

}

TY - JOUR

T1 - Short-living absorption and emission of CsI(Na)

AU - Yakovlev, V.

AU - Trefilova, L.

AU - Meleshko, A.

AU - Ganja, Yu

PY - 2011/12/1

Y1 - 2011/12/1

N2 - This paper investigates the short-living absorption and the emission of CsI(Na) under a pulsed electron beam (e=0.25 MeV, t1/2=15 ns and W=0.003...0.16 J/cm2). The bands of singlet self-trapped excitons, as well as Na0 and Vk color centers have been detected in the transient absorption spectrum of CsI(Na). It has been found that the activator luminescence spectrum, peaking at 3.0 eV, fits a Gaussian (E m=3.0 eV and FWHM=0.44±0.02 eV at 80 K) and remains the same at different time delays within 10-810-3 s. The decay kinetics of the 3.0 eV emission has one nanosecond exponential component and two microsecond ones with time constants 1.0 and 3.0 μs, which remain unchanged within 78150 K. It is concluded that the activator emission is due to the radiative annihilation of sodium-perturbed two halide excitons from the non-relaxed singlet state. The pathways of such excitons creation are discussed.

AB - This paper investigates the short-living absorption and the emission of CsI(Na) under a pulsed electron beam (e=0.25 MeV, t1/2=15 ns and W=0.003...0.16 J/cm2). The bands of singlet self-trapped excitons, as well as Na0 and Vk color centers have been detected in the transient absorption spectrum of CsI(Na). It has been found that the activator luminescence spectrum, peaking at 3.0 eV, fits a Gaussian (E m=3.0 eV and FWHM=0.44±0.02 eV at 80 K) and remains the same at different time delays within 10-810-3 s. The decay kinetics of the 3.0 eV emission has one nanosecond exponential component and two microsecond ones with time constants 1.0 and 3.0 μs, which remain unchanged within 78150 K. It is concluded that the activator emission is due to the radiative annihilation of sodium-perturbed two halide excitons from the non-relaxed singlet state. The pathways of such excitons creation are discussed.

KW - Cathode luminescence

KW - Color center

KW - Short-living absorption

KW - Sodium-doped cesium iodide

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