Exciton-exciton interactions in CdWO4 irradiated by intense femtosecond vacuum ultraviolet pulses

M. Kirm 1 V. Nagirnyi 1 E. Feldbach 1 M. de Grazia 2 Bertrand Carre 2 Hamed Merdji 2 Stéphane Guizard 3 G. Geoffroy 3 Jerome Gaudin 4 N. Fedorov 5 P. Martin 5 A. N. Vasil'Ev 6 A.N. Belsky 7
1 Institute of Physics [Tartu]
2 SPAM - Service des Photons, Atomes et Molécules
3 LSI - Laboratoire des Solides Irradiés
4 European XFEL
5 CELIA - Centre d'Etudes Lasers Intenses et Applications
6 Physics Faculty - Moscow State University
7 LPCML - Laboratoire de Physico-Chimie des Matériaux Luminescents
Abstract : Exciton-exciton interaction is experimentally revealed and quantitatively analyzed in a wide band-gap scintillator material CdWO4. Under high-intensity femtosecond vacuum ultraviolet excitation, the CdWO4 luminescence is quenched, while its decay becomes essentially nonexponential. We propose an analytical model, which successfully reproduces the decay kinetics recorded in a wide range of excitation densities. The dipole-dipole interaction between excitons leading to their nonradiative decay is shown to be the main cause of a nonproportional response common for many scintillators.
Keywords : CADMIUM TUNGSTATE SCINTILLATORS NON-PROPORTIONALITY LUMINESCENCE EXCITATION CRYSTALS DECAY RELAXATION ABSORPTION STATE
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Journal articles
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Submitted on : Thursday, September 25, 2014 - 4:04:16 PM
Last modification on : Wednesday, August 7, 2019 - 2:36:02 PM

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M. Kirm, V. Nagirnyi, E. Feldbach, M. de Grazia, Bertrand Carre, et al.. Exciton-exciton interactions in CdWO4 irradiated by intense femtosecond vacuum ultraviolet pulses. Physical Review B : Condensed matter and materials physics, American Physical Society, 2009, 79, pp.233103. ⟨10.1103/PhysRevB.79.233103⟩. ⟨hal-01068414⟩

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