Abstract
(CexCa1-x)F2+x single crystal with x = 0.0001 - 0.03 were grown by the μ-PD method. Ce3+ doping in CaFa lattice gives rise to characteristic absorption and emission bands, which are governed by the characteristics of the isolated Ce3+ -F i- C4v pair centers and small clusters composed from these pairs. With increasing Ce concentration there is a strong increase of the absorption bands related to the cluster centres, but the radioluminescence spectra are always governed by the emission of the isolated Ce3+ -Fi- C4v pairs without noticeable changes in the emission band shape. Highest radioluminescence intensity is achieved for Ce0.1{%} concentration and above 1{%} of Ce the onset of concentration quenching is observed. Scintillation response is governed by the energy transfer from the CaFa host lattice and even for the Ce3{%} sample the dominant scintillation decay time is about 50{%} longer with respect to the photoluminescence decay time of Ce3+ -Fi- C4v pair centres. Energy transfer processes and the role of different Ce3+-based centers are discussed.
Original language | English |
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Article number | 4545235 |
Pages (from-to) | 1484-1487 |
Number of pages | 4 |
Journal | IEEE Transactions on Nuclear Science |
Volume | 55 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2008 Jun |
Keywords
- Ce perturbed center
- Crystals
- Fluoride
- Scintillator
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- Electrical and Electronic Engineering