Short-living absorption and emission of CsI(Na) |
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Authors: | V. Yakovlev L. Trefilova Yu. Ganja |
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Affiliation: | a Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634034, Russian Federation b Institute for Scintillation Materials, 60 Lenin Avenue, Kharkov 61001, Ukraine |
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Abstract: | This paper investigates the short-living absorption and the emission of CsI(Na) under a pulsed electron beam (Еe=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 (Em=3.0 eV and FWHM=0.44±0.02 eV at 80 K) and remains the same at different time delays within 10−8-10−3 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 78-150 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. |
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Keywords: | Sodium-doped cesium iodide Short-living absorption Cathode luminescence Color center |
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