The Model for Luminescence Center Excitation in PbWO4 |
| D. Millers, L. Grigorjeva, S. Chernov and V. Pankratov Institute of Solid State Physics, University of Latvia, 8 Kengaraga str., 1063, Riga, Latvia |
| Received: July 23, 1998; revised version February 4, 1999 |
| Full Text PDF |
| The luminescence and transient absorption of PbWO4 crystals were studied. The electron beam (10 ns, E≈270 keV) was used as excitation source. The kinetics of luminescence is complicated - the prompt rise of luminescence intensity is followed by a slow (τr≈100 ns) rise. The luminescence decay at 80 K is nearly exponential with τd≈4.0- 4.5 μs. The decay kinetics of transient absorption at 3.5 eV can be described roughly by two exponents with time constants τ1≈100 ns and τ2≈4.0 μs. A common process responsible for absorption relaxation and luminescence rise is suggested. The luminescence center excitation occurs during recombination process via Pb2+ excited state formation and subsequent energy transfer to WO42- group. |
| DOI: 10.12693/APhysPolA.95.971 PACS numbers: 78.40.-q, 78.60.Ya, 61.72.Cc |