Abstract
The scintillation properties of Ce3+ doped CsGd2F7 and CsY2F7 crystals have been studied at various temperatures. Upon X-ray excitation CsY2F7:5 mol% Ce3+ shows fast ( tau approximately=32 ns) Ce3+ 5d to 4f luminescence with a yield of 1400 photons MeV-1 at room temperature. The most intense Ce3+ luminescence of about 7300 photons MeV-1 is found in CsGd2F7:20 mol% Ce3+. The scintillation decay curve of CsGd2F7:Ce3+ consists of at least two non-exponential components, one of the order of tens of nanoseconds and one in the microsecond region. Both CsY2F7 and CsGd2F7 show a broad STE emission band at around 445 nm, especially at low temperatures. VUV photon excitation measurements at 300 K and low temperatures revealed the presence of two inequivalent types of Ce3+ centres in both CsY2F7 and CsGd2F7. The presence of Gd3+ appears to have a dominating influence on the luminescence characteristics of CsGd2F7:Ce3+, due to the occurrence of both Ce3+ to Gd3+ and Gd3+ to Ce3+ energy transfer as well as energy migration over the Gd3+ sublattice. On the basis of the optical studies, models of the scintillation mechanisms of CsY2F7 and CsGd2F7 are developed which account for the scintillation properties of these crystals.
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