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

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.
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https://hal-polytechnique.archives-ouvertes.fr/hal-01068414
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Submitted on : Thursday, September 25, 2014 - 4:04:16 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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