The Model for Luminescence Center Excitation in PbWO4статья
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Дата последнего поиска статьи во внешних источниках: 21 октября 2020 г.
Аннотация:The luminescence and transient absorption of PbWO4 crystals werestudied. The electron beam (10 us, E 270 keV) was used as excitationsource. The kinetics of luminescence is complicated — the prompt rise ofluminescence intensity is followed by a slow (r,100 ns) rise. The lumi-nescence decay at 80 K is nearly exponential with rd4.0-4.5 μs. Thedecay kinetics of transient absorption at 3.5 eV can be described roughly bytwo exponents with time constants r1 Ń 100 ns and 7-2 4.0 μs. A com-mon process responsible for absorption relaxation and luminescence rise issuggested. The luminescence center excitation occurs during recombinationprocess via Pb2+ excited state formation and subsequent energy transfer toWO4- group.