Exciton-exciton interactions in CdWO{sub 4} irradiated by intense femtosecond vacuum ultraviolet pulses

Journal Article · Mon Jun 15 00:00:00 EDT 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.79.233103· OSTI ID:21294176

Kirm, M; Nagirnyi, V; Feldbach, E; De Grazia, M; Carre, B; Merdji, H; Guizard, S; Geoffroy, G; Gaudin, J; Fedorov, N; Martin, P; Vasil'ev, A; Belsky, A ^[1]

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1. Institute of Physics, University of Tartu, Riia 142, 51014 Tartu (Estonia)

Exciton-exciton interaction is experimentally revealed and quantitatively analyzed in a wide band-gap scintillator material CdWO{sub 4}. Under high-intensity femtosecond vacuum ultraviolet excitation, the CdWO{sub 4} 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.

• OSTI ID: 21294176
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 79, Issue 23; Other Information: DOI: 10.1103/PhysRevB.79.233103; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CADMIUM TUNGSTATES
DENSITY
DIPOLES
EXCITATION
EXCITONS
INTERACTIONS
KINETICS
PHOTOLUMINESCENCE
PULSES
QUENCH AGING
SCINTILLATIONS
ULTRAVIOLET RADIATION
VELOCITY